PowerWatcher user manual
Contents
1. smartphone PowerWatcher works as USB Device hence smartphone must be able to support OTG The aa test to check this ability is connecting USB flash memory stick to a smartphone and Connectors pin out VGA interface connector a k a DE 15 DSUB15 is used for sensors connection Alternatively some or all of the connecting wires can be directly soldered into PCB to minimize errors caused by contact resistance DSUBIS5 pin out Pin number Function 1 Shunt Shunt Common potential minus of traction battery Common potential for thermo sensor return Battery Thermo sensor Not used 5V sensors power supply O OWINALT ND MA AION Common potential mi Common potential RX 12 TX 13 Speed sensor 1 14 Speed sensor 2 15 Common potential Pin out for direct wire soldering into PCB bypassing the DSUB15 connector Pin number Function 1 Battery 2 Not used 3 Not used 4 Common potential minus of traction battery 5 Common potential 6 Not used 7 Shunt 8 Shunt 9 Not used 10 Thermo sensor 11 5V sensors power supply 12 RX 13 TX 14 Speed sensor 1 15 Speed sensor 2 Software deployment on Android based device 1 Check USB Host function of your smartphone Download USB Host Diagnostics from Play Market and run it Run the diagnostics and a2. PowerWatcher user manual PowerWatcher device is intended for data measurement indication and storage of the major operational parameters of an electric vehicle electric scooter or other electric transportation means The device is capable of measuring a current voltage speed defined point temperature and of indicating a number of parameters calculated as functions thereof e g a power energy consumption rate number of charge discharge cycles mileage etc Data is indicated via an external device which can be an Android v3 0 or newer based smartphone or a tablet capable of supporting the OTG function Power supply range of the PowerWatcher is 50 250V DC practically down to 30V DC in the most cases Measured current range depends on the shunt resistance Full scale range for ADC purpose of the shunt voltage is from 120mV to 120mV Connecting the sensors Use any suitable shunt for the current measurement taking into account your range of current as suggested above Set shunt resistance in microOhms in the settings menu Temperature measurement is calibrated for NTCM 100K thermoresistor type Use a hercon from bike computer or a Hall sensor with an open collector output as a speed sensor Power no c Ss 1 al 2 ll 3 4 NTC1 4 HO 5 6 _ Battery 7 8 9 10 aT a IN n 12 13 Hall sensor Ae gi Power SpeedSensor Reed switch Connecting a
3. gree to fix errors as the program propmts 2 Download PowerWatcher program from Play Market 3 After the connection of your smartphone to PowerWatcher device the software will run automatically Warning Device gives power supply from battery not from USB So device works only then it connected to battery Setting the software PowerWatcher software has 3 screens Display All parameters and Settings Switching between the screens is by double tap Main screen or Display solely indicates the selected parameters All parameters screen allows selecting the parameter set to be indicated on the Display screen Settings screen allows changing general settings There are several initial settings to be done prior to use Wheel length for correct speed and distance calculation Shunt resistance for correct current derived parameters calculation Battery capacity Charged voltage i e voltage of the traction battery when it is fully charged To adjust current consumption indication if it differs from zero in idling condition of a vehicle press the button Reset current offset to zero Working algorithm For correct calculations of energy related data the PowerWatcher device must be connected to the traction battery at all times i e while charging and discharging The criterion of the end of charging during the charging process is defined a
4. s the battery voltage having exceeded the pre set value of Charged voltage and 1 of Battery capacity extra charge added into the battery after that event When the end of charging criterion is satisfied then a number of other parameters gets reset e g daily mileage consumed energy average and peak speed current etc Battery charge level is then set at 100 The remaining battery charge percentage is calculated based on the full battery capacity and spent charge in amp hours
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