telemetry user manual
Contents
1. Pot hidde under label Current sensor calibration Calibrates current sensor and changes altitude to absolute from AGL the default The current sensor is calibrated at the factory and will not normally need attention If for any reason you swap current sensors or replace one then you need to re initialize it to remove any offset Expose the pot switch and have a small screwdriver ready to adjust it 1 Bind the telemetry unit to the transmitter with a suitable receiver as explained earlier Lemon Telemetry Instructions 11 Dec 14 2 Upon successful binding power off the telemetry receiver unit but leave the transmitter turned on Remove the bind plug 3 Turn the pot switch fully clockwise to the right 4 Plug the V I sensor and Temperature RPM sensor if required into the telemetry unit 5 Power on the telemetry with a flight pack attached to the sensor The green LED should become steady on within no more than 3 seconds This indicates the current sensor s bias calibration is completed successfully If the red LED is on the unit has failed to calibrate and you should try again from the beginning If bias calibration remains unsuccessful the unit is faulty 6 Turn off power to the receiver telemetry unit Adjust the pot switch to approximately the middle position and power on again to resume normal operation The green LED should then flash twice a second as usual Changing to absolute altitude readout As expl2. neat When plugged in the external temperature sensor Shown at right automatically replaces the internal telemetry unit value with the more accurate external probe value As shown the RMP sensor uses the red wire that is included with the temperature sensor but not connected to it See RPM on page 7 for an explanation of the RPM indicator This is the external temperature sensor LED Signals on the Telemetry Unit Red LED Solid Correct data exchange with receiver This means the telemetry unit is recognizing the transmitter and has transferred the telemetry packet to the transmitter for display Flashing rapidly The receiver is in bind mode Absent No connection Green LED Solid The Current sensor initialized correctly when using the hidden pot switch The Red LED will light up if initialization fails see page 8 Flashing The altimeter is set to provide height above ground level AGL data the default The green LED also flashes while binding Absent The altimeter is set to absolute barometric height ASL based on standard 101 325kPa as sea level atmospheric pressure In addition green and red flashes are used as confirmations during user calibration of Current and Voltage See page 9 A single quick flash of the green LED at power up identifies versions of the telemetry unit v1 5 and beyond For most users a solid red LED and a flashing green LED indicate correct operation Lemon Telemetry Instru
3. in order to display height above ground level AGL which is what most people are looking for when they think of the height of a model the Lemon telemetry unit as delivered sets the altitude reading to zero every time power is connected The Lemon altimeter is quite accurate by hobby standards It is ambient temperature compensated but will have small errors due to internal noise onboard heating of the components and natural variation of atmospheric pressure during the flight It is normal for the height reading to fluctuate by up to 6ft 2m and this variation may increase during A forthcoming version of the telemetry unit will have an improved Signal Indicator function to give more useful and reliable results that range from 0 100 Lemon Telemetry Instructions 11 Dec 14 unusual weather conditions with rapidly changing conditions This is an inherent behavior of a pressure altimeter and not a fault of the unit Display in meters or feet is chosen in the telemetry setup screen Flight battery current is displayed on the same screen if you have the V I sensor connected Temperature The external temperature probe is accurate at room temperature to within 1 F or better The sensing element is a 10kNTC thermistor and maintains good accuracy at all temperatures The internal temperature reported by the unit when no external temperature sensor is plugged in may be a little higher due to heat dissipation on the board The reading can be dis
4. Without any additional sensors it will display receiver voltage RxV signal indicator A accurate height above ground level Alt and the internal temperature of the unit Temp The unit is supplied with two plug in sensors The first is an accurate external temperature probe which automatically replaces the internal temperature when connected and can be used to monitor LiPo pack or ESC temperature in flight The external temperature sensor also includes a sensor wire for measuring RPM from one of the motor wires Before using the RPM function please review its limitations as discussed on page 7 The second plug in sensor available with either Deans style T connectors or XT60 connectors measures flight power pack current and voltage The instantaneous readings are displayed on screen in the Amps and Volts fields In addition on Spektrum transmitters that provide a PowerBox display the cumulative number of mAh drawn from the flight pack and the pack voltage at higher resolution are displayed The displays may vary depending on the fields chosen in Telemetry Setup in the transmitter menu and on the capability of the transmitter itself for example the DX6 and DX7s do not display PowerBox The telemetry unit works with any Lemon DSM2 or DSMX protocol receiver that has bind connector pins This includes the 7 channel Stabilizer as well as the 6 channel DSMX protocol compatible receiver the 10 channel DSM2 protocol compatible receiver and
5. 23 eae gt s ee eee re CHANNELS 30 MODELS 2 TYPES 2 4GHZSM SPREAD SPECTRUM TELEMETRY SYSTEM Shut down the motor and turn off the telemetry unit Move the pot switch to the middle position and power on again to resume normal operation You can also use a power resistor load if you have access to one that can handle the large currents involved It is safer and a bit easier to get a steady reading Not available on DX6 and DX7s transmitters Lemon Telemetry Instructions 11 Dec 14 10 IMPORTANT The calibration system will loop through the three states in turn so if you skip one by accident just repeatedly touch the center bind pin with the wire until you reach the one you want However any time you enter a calibration flashing LED mode the range is set to that pot position The result is that you cannot just calibrate a single function by jumping to that function without re doing the others For example if you go to current calibration you will have gone through Flight Battery Voltage and Receiver Voltage to get there and those voltages will have been recalibrated to whatever the pot position had been for the current calibration Bottom line If you do a calibration then the display must be actively set to the correct value for each one of the three variables every time you select a variable Flight Battery Voltage Receiver Voltage Flight Battery Current The telemetry unit stores the last calibration value it sees when th
6. Lemon DSM2 DSMxX protocol Telemetry Unit Instructions NOTE These instructions are based on version 1 5 of the Lemon Telemetry unit sales of which began in December 2014 See Variants on page 11 for an overview of version differences These instructions are written by two users on RCGroups jj604 and Daedalus66 We have no connection with Lemon Lemon and Orange are brand names Spektrum DSM2 DSMX X BUS Airware STi and the Telemetry logo are Trade Marks of Horizon Hobby Deans and PowerBox are Trade Marks These names are used here simply as descriptions of those items Overview The Lemon Telemetry unit will transmit telemetry data from the model when connected to the bind port of most DSM2 DSMxX compatible receivers whether Lemon Spektrum or Orange The unit has inbuilt sensors for receiver voltage temperature and altitude as well as external sensors for temperature flight battery current and voltage and motor RPM Display of the data requires a suitable Spektrum or compatible transmitter that will show selected values on the screen At present the following Spektrum transmitters can receive and process the data from the Lemon unit DX6 2014 version DX7s DX8 DX9 DX10 and DX18 In addition the Lemon unit works with the now discontinued Spektrum STi Telemetry interface SPMTR1000 for the iPhone iPad It may become possible for other transmitters to display the telemetry data if equipped with a compatible telemetry capab
7. SM TECHNOLOGY HIGH SPEED 8CH RECEIVER 2048 Connection and Binding With transmitter off and no power to the receiver connect the telemetry unit to the receiver bind connector using the included cable as shown above Orient the connector so the black wire connects to the pin labeled or GND Note that the Lemon unit does not have the equivalent of the X BUS port found on the side of a Spektrum TM1000 telemetry unit You should also connect the receiver satellite s if used Do not connect the external V I sensor or Temp RPM sensor at this time Make sure you have a model memory set up in the transmitter for the receiver telemetry unit You are ready to bind 1 Puta bind plug on the telemetry bind connector 2 Connect power to the receiver maximum 7 2v from either a A separate receiver pack 4 or 5 cell NiMH 2S LiFe or b A separate 5V or 6V BEC or c The throttle cable of an ESC with inbuilt BEC 3 All red orange LEDS should be flashing rapidly on the telemetry unit receiver and satellite if used to indicate bind mode If not locate the problem before proceeding 4 Move the transmitter 3 6ft 1 2m away select the appropriate model memory place the throttle Stick in low and turn on in bind mode see transmitter instructions for how to do this 5 Wait until the bind is complete and the receiver and telemetry LEDs are steady 6 Disconnect power from the receiver Turn off the transmitter 7 Remo
8. This is not a Lemon calibration issue but a consequence of the way in which Spektrum transmitters display the numbers Current calibration is limited by display fluctuation at minimum resolution The pack and receiver voltage however are only displayed to a resolution of 0 1V which is greater than calibration accuracy Consequently you need to choose between mid point calibration and lowest limit calibration if you are concerned about precision Mid point calibration The chart at right shows what is normally understood by calibration and is technically the truest representation of the voltage within the limit of the bispiayea 8 display The output follows the input accurately and the eae display changes from one reading to the next at the voltage half way between the two values 4 7 4 6 Hence with dropping voltage the display will change at 4s 46 47 4s 45 50 5 4 95 V from 5 0 to 4 9V Actual Voltage Lower limit calibration This is what you may choose to set if you want the voltage alarm to trigger as soon as that voltage is reached Using this approach at 4 90 V the display will change 5 1 from 5 0 to 4 9V In practice flight pack and receiver voltage alarms are intended to alert you to when the voltage has dropped to a critical level Lower limit calibration will do that a a whereas mid point calibration will not trigger the alarm re a until the voltage has dropped by another 0 05Volts 4 6 Bottom l
9. able to leave the unit as delivered If you do not understand the process and fail to follow the directions below carefully it is easy to introduce large errors in any one of the three values Calibrating flight battery voltage receiver voltage and current First bind and calibrate as described under Current sensor calibration on page 8 Then you can calibrate each sensor 1 Flight Battery Voltage After successful Current sensor calibration as described above and without moving the pot still fully clockwise or Bo allowing the power to be interrupted touch the RPM wire red wire briefly TA e to the middle pin of the bind connector Be careful not to short the pins y perey SYSTEM The green LED should now be flashing which indicates that the battery voltage is ready for tuning Now turn the pot until the flight pack battery voltage shown on the transmitter screen agrees with the value measured using an accurate voltmeter Lemon Telemetry Instructions 11 Dec 14 2 Receiver Voltage Again briefly touch the RPM wire to the middle pin of the bind connector The red LED should start to flash Turn the pot until the receiver voltage shown on the transmitter screen agrees with the value measured using an accurate voltmeter 3 Flight Battery Current Again briefly touch the RPM wire to the middle pin of the bind connector The green and red LEDs should start to flash Turn on the motor with throttle stick while measuring the c
10. ained above the unit as supplied shows height above ground level AGL as this is what nearly all fliers understand by model height A ground level of zero is set every time power is connected to the telemetry unit If for any reason you want readout in absolute pressure altitude above sea level ASL rotate the pot switch fully anticlockwise with power off and leave it there The green LED will now be absent rather than flashing twice a second Since the displayed height is based on a standard sea level pressure of 1013 25 kPa for an accurate altitude reading you will need to apply a correction for current barometric pressure at your location Calibration The unit is calibrated at the factory and most users will simply use it as delivered However the firmware allows the user to fine tune the span value of the battery voltage and receiver voltage to the absolute correct level The current and consumption values can also be calibrated against a known accurate wattmeter or high current ammeter By enabling calibration mode on the telemetry unit you can use the pot hidden under the label to adjust the value displayed on the telemetry screen in real time to match that of an accurate meter Once calibrated the span value will be saved in EEPROM thus ensuring accurate measurement See the Appendix for a discussion of how the limited display resolution might affect this Unless you are sure you need to recalibrate your telemetry system it is advis
11. ctions 11 Dec 14 Additional Information Detailed information about the Lemon Telemetry Unit The Lemon Telemetry unit is not a copy of anything made by Spektrum but an original design that conforms to the Spektrum data transmission protocol and the DSM2 DSMxX radio protocols The Lemon unit differs from the Spektrum TM1000 4 telemetry unit both in construction and in the way it provides certain data Most obvious is that there is no display of the Fields H and F Holds and Frame loss nor are there packet loss indicators for the four possible receivers A B L and R These features are unique to Spektrum systems In their place Lemon provide a general Signal Indicator displayed in the A field that provides roughly similar data on the strength and reliability of the radio link The unit is significantly smaller than the Spektrum one and about half the weight It operates over an input voltage range of 3 45 to 7 2v Despite the 5 5V max written on the label Specifics The Lemon Telemetry unit uses an ATmega 88PA microprocessor and a 2 4Ghz transmitter to send data signals to your transmitter It synchronizes with the receiver via the bind connector so that it cannot interfere with the radio control link It reads the receiver voltage and the number of data packets successfully arriving at the receiver combines those with its own data from sensors and sends the whole lot to be displayed on the transmitter telemetry screen
12. e LED s were flashing Note for v7 0 units This voltage and current calibration functionality is not available Variants All versions of the Lemon Telemetry unit to date are externally identical These instructions are based on version 1 5 sold from December 2014 This version which gives the user the ability to calibrate the voltage and current readings can be identified by a green LED flash on start up The initial version of the Telemetry unit v 1 0 without span calibration capacity was produced in small numbers prior to this date Due to a factory error a few units of Version 1 0 were sold with resistors in the current sensor that were of looser tolerance than specified In a few cases this could lead to errors in the current reading of up to 10 Purchasers with units that show more than the acceptable error of 5 should contact Lemon A very few early v1 5 units have a bug in the firmware that means the current value will not display over 30Amps If you exceed 30 Amps the display resets to zero If you have such a unit contact Lemon This does not apply to v1 0 units Lemon Telemetry Instructions 11 Dec 14 11 Appendix Calibration choices The effect of the options described below is small Users can ignore this section unless looking for maximum accuracy in setting alarms For greatest accuracy in alarm behavior it is necessary when adjusting the display readout to choose how you want the resolution limits to work
13. e zero Alarms Alarms can be set in the transmitter telemetry setup screen for Min and Max values of Pack Voltage Current RPM Temperature Altitude and Receiver voltage Spektrum PowerBox and Flight Log alarms are not applicable to the Lemon unit Alarms and displays can be activated or inhibited Alarms can be Tone Vibration or both Telemetry Range Lemon claim that in terms of range their telemetry unit is in the same class as the Spektrum TM1000 system It has slightly higher RF transmission power Spektrum peaks at 17dB while the Lemon telemetry system peaks at 22dB This higher RF transmission power is intended to give better RF transmission reliability In a side by side comparison with a Spektrum full range telemetry unit Lemon report that their telemetry unit always has at least the same receivable range as the Spektrum TM1000 Practical tests by users have shown that even with surrounding WiFi traffic a range of around 1000ft 300m is routinely achievable Under better conditions about 1500ft 450m line of sight seems to be a reasonable limit Advanced Adjustments The unit has a small hidden rotating calibration pot that also acts as a 3 position switch This pot switch is revealed by peeling back a corner of the label and is normally in the middle position It can be used to initialize a new current sensor change the altitude display and calibrate the voltage and current readings for maximum accuracy
14. ernal BEC of an ESC It should not be used with a power supply over 7 2v such as a 2s LiPo pack Accuracy and Limitations Signal Indicator The Lemon system does not report Frame Losses F and Holds H since this is data generated only by Spektrum systems Nor does Lemon report individual packet losses on up to four separate receivers satellites A B L and R as Spektrum does However the Lemon unit does use the A display for a Signal Indicator value This is calculated from the number of packets lost in transmission A reading of 100 means that no packets have been lost in transmission while smaller numbers indicate losses The value is based on the number of packets received about every half second In versions of the Lemon unit to date it is of limited use and tends to give readings that range between 85 and 100 Note that as with some other telemetry systems if the data communication link is broken the last known Signal Indicator value will stay on the screen until data communication is restored As noted previously the B L and R satellite receiver fields are not used by the Lemon system nor are the F Frame loss and H Hold fields Receiver voltage is displayed on the same screen as the Signal Strength indicator Height The unit includes a Bosch BMP 180 integrated digital pressure and temperature sensor Since this is used to report altitude the reading will vary with local barometric pressure Accordingly
15. ine Use lower limit calibration to achieve most accurate alarms 4 5 46 47 48 49 50 5 1 Actual Voltage Setting lower limit calibration is easy For example with a known voltage of 5 00V adjust the calibration until it is just flickering between 5 0 and 4 9V Mid point calibration is set by putting the pot halfway between where the display flickers at the lower and upper value The values used are just examples for illustration and the principles above apply to whatever actual voltage you are calibrating against Revised InstructionsA4 docx Lemon Telemetry Instructions 11 Dec 14 12
16. itter display screen this is very convenient Exit back to the MAIN screen when you are finished 2 4GHz DSM SPREAD SPECTRUM TELEMETRY SYSTEM As explained under Signal Indicator on page 6 the A field under Flight Log will provide a basic measure of signal reception If your receiver is powered up properly bound and the telemetry unit is connected you will see the bars logo marked on the screen at right Congratulations you have a fully functioning telemetry unit linked to your transmitter At a bit over an inch square 38x26x12mm with a total weight of 11g and only one connection cable to the receiver it s a self contained package that s hard to beat for convenience Most people however will want to add flight pack voltage and current sensing capability and that s where we go next Adding External Sensors The Voltage Current sensor and or the Temperature RPM sensor can now be connected to the appropriate sockets on the Telemetry unit with power off The EXT socket is reserved for future use After connecting an external sensor the receiver and telemetry unit must be re bound to the transmitter with the flight pack connected in the case of the Voltage Current sensor Use the same process as in Getting Started First Time Use on page 2 Voltage Current sensor Goes in line with battery RPM wire 1 The examples show a DX8 transmitter Other transmitters may have different displays bu
17. le module such a unit is said to be under development by another manufacturer The focus here however is on using the Lemon unit with a Spektrum transmitter The first four pages of these instructions should give you what you need to get the telemetry unit up and running The rest of the document consists of various kinds of additional information likely to be of help and interest to some users Getting Started First Time Use Before starting you need to prepare your model bind the receiver and set it up to work with your transmitter as usual Do all the normal setup of servos and mixes so that the model is ready for flight before moving on to the telemetry setup It is strongly recommended that you review the Telemetry section of your transmitter manual in order to understand how the telemetry function and displays work This is what the basic connection to a Lemon And here is the same setup for a Lemon 7 10ch receiver looks like channel stabilized receiver Telemetry unit connects to receiver bind connector rwan Joma a E 7g Bind Plug osm er A TELEMETRY SYSTEM SOCS IN here P when binding Lemon Telemetry Instructions 11 Dec 14 Here is what it looks like with an Orange And finally here is the Lemon unit connected RX3SM Although the servo ports on this to a Spektrum AR8000 with satellite receiver are Molex 1 25mm pitch Picoblade connectors the bind connector is a standard 0 1 header AR eoOooO 2 4GHz D
18. most others Various Spektrum and Orange receivers have also been tested and found to work with the Lemon unit Lemon also states that their satellites are plug compatible with Spektrum but it is sensible to test the correct operation of receivers and satellites of different brands The connection lead plugs into the data socket of the Lemon Telemetry unit labeled To Receiver Bind and the bind port of the receiver just as the Spektrum TM1000 unit does A Y cable can be used on the bind pins of a Lemon stabilizer if that connector is also used for Aux2 the telemetry unit will not interfere with the Aux2 output i Spektrum also make a limited range TM1100 unit without an X BUS port but the TM1000 is the closest comparable one to the Lemon Lemon Telemetry Instructions 11 Dec 14 The Lemon unit does not have an X BUS port and is not Spektrum X BUS compatible Nor are the three pin JST ZH connectors the four small white ones wired like Spektrum For this and other reasons Spektrum sensors are NOT interchangeable with Lemon sensors Do not interchange Lemon and Spektrum telemetry unit hardware and connectors as the polarities are different The unit has been designed on the assumption that most people will be using a 5V BEC power source However it will operate on a voltage of from 3 45 to 7 2V from the receiver So in practice this power source can be a 1S LiPo a 4 or 5cell NiMH pack a 2S LiFe pack a separate 5 or 6V BEC or the int
19. olution of the Spektrum transmitter display is limited to one decimal place Accordingly a true voltage of 13 00 V may legitimately display as 12 9 13 0 or 13 1 V This resolution is adequate for tracking pack voltage during flight Either the internal or the external temperature sensor if connected will display on this screen As well the RPM value will display if the sensor wire is connected to a motor wire Current and mAh used The flight battery sensor is factory calibrated to the telemetry unit it ships with but can be re initialized if used with another unit Voltage limit is 30v and current 60 Amps Again the Lemon telemetry unit is within the resolution of the Spektrum display which reads only in full Amps However the pack voltage can be displayed to higher resolution on the PowerPowerBoxbox screen of the transmitter display as well as the consumption from the flight battery in mAh tA forthcoming version of the telemetry unit will have an improved RPM function with a comparator and trigger circuit to give more reliable and accurate results Lemon Telemetry Instructions 11 Dec 14 T Lemon claim better than 5 accuracy in mAh consumption reporting and in normal use you can expect 2 3 accuracy This is quite good by hobby standards and is ample for tracking the state of discharge of the battery The PowerBox display will show Voltage and Capacity for only a single flight pack Battery2 and Capacity2 will always b
20. played in C or F but is limited to whole degree resolution in both RPM The RPM input is obtained via a single wire connected to any of the three wires of a brushless motor The unit detects voltage pulses from the motor wire and calculates RPM from their frequency based on the setting on the transmitter telemetry setup screen for the number of magnetic poles in the motor The display shows 1 10 of the actual RPM That is 1234 is actually 12 340 rpm If the number of poles is not available it can be estimated by comparing RPM displayed with the reading from an optical tachometer while the motor is running the pole number can be adjusted to get agreement Lemon suggests that the gear ratio adjustment provided on the Spektrum transmitter can also be used to match the RPM display to the tachometer reading It should be noted that the RPM circuit is just a simple voltage divider with some software filtering and an adjustment for waveform that is not always reliable or accurate Depending on the type of ESC and the design of the brushless motor different pulse widths may be produced for the same RPM Hence the display does not always give consistent results Whether the RPM readout is useful will depend on the ESC and motor you are using The RPM wire is also used for user calibration of voltage and current accuracy See Advanced Adjustments on page 8 Receiver and Flight Pack voltage The telemetry unit is accurate to 0 1v and the res
21. t the principles of setup are similar Lemon Telemetry Instructions 11 Dec 14 The Voltage Current sensor can be damaged if subjected to reverse voltage Check the polarity of the connections before plugging in the flight battery Displaying Data from External Sensors Configure the transmitter screens to show the values you are interested in from these additional sensors As we saw previously there is little flexibility in the screens as they have been largely pre configured The current voltage sensor will display the instantaneous pack voltage in the Volts field and total current in the Amps field Alarms can be set for Min and Max values If the PowerBox PBox field is available on your transmitter voltage can be shown to higher accuracy and the cumulative number of mAh consumed can be displayed If these values do not appear check that you have activated Act the PBox display in the transmitter Telemetry setup screen Note that with the Lemon unit there is only one set of battery voltage and capacity readings the original PowerBox sensor unit monitors two separate supplies and there are NO alarms available for PowerBox values as these depend on the presence of a PowerBox sensor unit The practical outcome is that no alarm is available for the percentage of pack Capacity used This red wire just pulls out of the heat shrink and becomes the rpm sensor wire to one of the motor connections if you need it otherwise leave it
22. urrent with an external meter BEWARE of the spinning propeller For maximum accuracy and because of fluctuations in the reading it is advisable to calibrate the unit at as high a current as you can reliably measure or at least in the general range of current you are interested in measuring For instance a variation of 0 3 Amps at 3 Amps is an error of 10 but at 30 Amps it is only 1 Any error will be in both the current display and the mAh consumption figure Go to the PowerBox page on the transmitter display and check the reading on Capacity 1 The numerical value shown as mAh is actually the reading for current in mA The value will flicker as the display toggles between minimum resolution output values This is an inherent limitation of the measuring circuit in the telemetry unit Note that if you connect to a load that draws more than about 4 Amps the display may initially appear as zero This may be because the pot is still fully clockwise and at maximum sensitivity and the display is off the scale Rotate the pot anticlockwise until the telemetry reading matches as closely as possible the value shown by your meter For example if your current meter reads 22 0 Amps turn the pot on the telemetry unit to show as close as possible to 22000 on the transmitter PowerBox screen Do not expect to match more closely than about 0 2 0 3 Amps In the example below the Emeter on the left is ene 22 0 ial while the closest steady ann was 22 2
23. ve the bind plug from the telemetry unit 8 Repower the transmitter and then the receiver telemetry unit Correct operation is shown by a solid red LED and flashing green LED 2x second on the telemetry unit Solid red orange lights on receiver and satellite indicate a good radio link Lemon Telemetry Instructions 11 Dec 14 Configuring the Transmitter Screens first steps The Telemetry screen on the Spektrum transmitter allows you to select which data items are recognized You cannot however choose where on a telemetry screen they appear only whether they are there or not The placement is pre programmed Access to the transmitter s Telemetry setup screen is from the System Setup screen Select one of the fields then click and rotate the roller to select the item you want displayed in that field In the example at right the second field is selected and configured to display Amps When a field has an item selected clicking on that item will open a screen of options generally whether to display or not alarm values if relevant and some user variables Note that the FlightLog field alarms are not used by Lemon The Settings field allows you to set when the telemetry screens are displayed the units used plus the name of gt data logs and how they are started In the Settings screen setting the Display to Roller means that you can use the roller to scroll through the telemetry screens at any time from the normal main Transm
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