SenSei - 5 Wits Productions, Inc.
Contents
1. Low www 5WitsProductions com SWIT E PRODUCTIONS Output Configuration Jumper An onboard jumper allows the board to be operated in relay or open collector sinking transistor output mode The sensor must be run in one mode or the other When run in Sink position the relay is never energized causing the touchsensor to operate silently Sink Position Relay Position Electrode Selection The design wiring and layout of your sensing electrodes is of great importance in creating a robust reliable touch sensing system The load capacitance of your electrode is a factor in the sensitivity of the system The touch sensor detects the change in capacitance caused by the proximity or touch of a person or object if the change is too small relative to the initial load Capacitance on the system the device will detect unreliably or not at all Thus the metal object used as a sensing electrode cannot be too large or the device will not see enough of a change when touched by a person Trial and error is helpful in electrode selection In general any hand held size metal object will work well If you are attempting to detect with a large electrode plate one option is to use a mesh screen instead of a solid metal object to decrease the initial load capacitance of the system but still provide a wide detection area Page 4 of 6 SenSel USER2. e Red output indicator e Green power indicator Connections e All connections are made using removable terminal blocks e Accepts wire 16 26 gauge Input Signal e A one wire connection turns nearly any small metal objects into a touch switch e tis possible to create a system that detects proximity inches away through the air or any dielectric such as glass plastic ceramic or wood in addition to sensing touch directly Outputs e There are two jumper selectable output modes available o SPDT relay rated for switching 5A 250VAC 30VDC o Open collector sinking transistor output rated for 350mMA 24VDC e High quality relays have an average life of 30 000 cycles at their full rated load up to 2 000 000 cycles at no load e Screw terminals are provided for normally open and normally closed relay contacts as well as the open collector Page 2 of 6 SenSel USER MANUAL VERSION 3 PHYSICAL DIMENSIONS 1 750 1 300 0 787 1 300 aa 0 598 lt 4 759 gt TYPICAL WIRING Relay Output TaN CRN SN UN 7 AUAA FSP SF ON OP iog JISNIS Power Source Conductive Object an www 5WitsProductions com BW Ts PRODUCTIONS Mounting The four mounting holes are 0 20 inches in diameter and are located on 1 30 inch centers This size hole is suitable for mounting with a 8 or 10 machine screw or a simple wood drywall screw Care should be ta
3. MANUAL VERSION 3 When attempting to detect through a dielectric panel such as plastic wood or glass sensitivity can be increased by using a larger electrode area reducing the panel thickness or using a panel with a higher dielectric constant We have had success sensing the presence of a hand reliably three or more inches away through air wood and plastic Your electrode must be an electrically isolated object not connected to power or ground Be careful to isolate your touch sensing circuit as much as possible from electrical noise grounding and high Capacitance objects Touching or in some cases proximity to high capacitance objects such as a large metal object like a filing cabinet or metal desk grounded objects such as electrical appliances and or sources of AC hum such as power cords can affect the reliable operation of the device While reliable detection can be achieved with a sensing wire running 5 feet from the metal electrode to the SenSel device under ideal circumstances it is recommended that you keep the wire connecting the sensing electrode to the SenSei as short as possible Keep the sensing plates as close to the device as possible to minimize the potential for long wires to pick up noise Be aware that each part of the SenSei and its wiring may be touch sensitive Touching the terminal block screws holding the wire that connects the electrodes to the device or any other physical contact with
4. USER MANUAL SenSel Single Channel Touch Sensor Version 3 September 2012 HW Ts E PRODUCTIONS SenSel USER MANUAL VERSION 3 SenSei USER MANUAL Single Channel Touch Sensor FEATURES e Allows any small conductive metal object to be used as a vandal proof weather proof touch switch e Single output touch switch with power and output LED indicators e On board voltage regulator accepts a wide range of input voltages 8 24 VDC e Dry contact relay output capable of switching up to 5A 250VAC 30VDC e Open collector sinking transistor output capable of sinking up to 350mMA 24VDC e Touch sensor sensitivity can be configured with an onboard 4 position switch e With proper design of your sensing electrode this unit can detect proximity or near touch through air or a variety of dielectrics such as plastic wood or glass e Removable repositionable terminal block makes wiring much easier TYPICAL APPLICATIONS e Finger activated touch the ultimate durability replacement for pushbuttons Interactive museum exhibits Hand or foot proximity detection Seat occupied detector Animal detection Monitor for liquid levels Monitor for materials handling Specialized input interface for a PLC microcontroller show control system or computer www 5WitsProductions com SWIT v E PRODUCTIONS SPECIFICATIONS Input Power Requirement e 8 24 VDC 100mA minimum LED Indicators
5. eriences for museums theme parks and other immersive attractions This touch sensor is one small example of the enabling technologies we use to create our award winning experiences We would be happy to helo make your next interactive project a SUCCESS Poe e Eee ERECEM SCP RES ERS OUESECESEOU SSC ES SE SI SE SESE SIS USES SSUES SEC USE SSE C SSE SCPE CeCe See e See ese reser ese reserecerecereeer icy RW Call or visit us on the web for more information POeeeU UES ESSEC E SESE SSLCE SEUE SESE SS EE SEP ES SEE SSP RSS LESSER SSS OSS EES SS ESSE ESOC ESSE SSE SESE S SSE SESE SSeS CEC User errr sere scree scree Ts E PRODUCTIONS www 5WitsProductions com
6. ken not to attach the PCB down on a conductive surface as there are exposed traces on the bottom Open Collector Output Supply Conductive Object Page 3 of 6 SenSel USER MANUAL VERSION 3 USING THE TOUCH SENSOR Touch sensing technology has been around for many years but recent advances in mixed signal programmable devices are increasingly making capacitance based touch sensors a practical and value added alternative to mechanical switches in a wide range of products and applications The device is designed specifically for human interfaces although it may also be used in some material sensing applications Slow regular recalibration eliminates the all too common stuck sensor condition of lower quality touch sensors and eliminates problems caused by variances and signal drift over time from component aging and temperature changes This model of the SenSei will reset a stuck input if that input remains high for roughly 60 seconds This means if you finger remains on the electrode and the SenSei is sensing for roughly 60 seconds it will automatically switch the output off and recalibrate Sensitivity Configuration Switch An onboard rotary switch allows for sensitivity adjustment Use a small screwdriver to gently turn the arrow on the switch from 1 least sensitive to 4 most sensitive Power cycle the device after adjusting sensitivity for the best results Medium Medium
7. nit will operate without a problem from a 24VDC supply stepping down from elevated voltages causes the onboard voltage regulator to dissipate heat If your application is holding the relay in the energized position for many minutes using a 24VDC source voltage the unit may get warm to the touch Wiring Safety Be aware that there are traces and exposed terminal block pins on the bottom side of the PCB Do not place the board directly ona conductive surface If switching high voltage loads take care to safely enclose the board Some components on the are electrically connected to the relay terminals and the board should not be touched or manipulated when attached to live high voltage power Page 5of6 SenSel USER MANUAL VERSION 3 DISCLAIMER This is not a life safety device Capacitive sensing is subject to unpredictable environmental influences This device should NOT be used in any application where a person s health or safety could be jeopardized by improper or unforeseen operation of the device Do not use this device in such a way that its malfunction could cause injury 5 Wits Productions Inc is not responsible for any special incidental or consequential damages resulting from any breach of warranty or any legal theory including lost profits downtime goodwill damage to or replacement of equipment or property or any costs associated with the use of 5 Wits Productions products as described herein 5 Wits P
8. roductions reserves the right to make changes and improvements to the specifications and components of this product and or this manual at any time without notice 5 Wits Productions has made every effort to ensure that the information in this document is accurate and complete at the time of publication 5 Wits Productions assumes no liability for any damages that result from the use of this manual or the equipment it documents BW Is PRODUCTIONS WARRANTY 5 Wits Productions warrants this product to be free of defects in materials and workmanship for a period of ninety 90 days from the date of purchase If this product is defective 5 Wits Productions will at its option repair or replace the product Return the defective product by mail to our current address given on our website with a brief description of the problem and we will return your item or its replacement in a timely manner 5 Wits Productions will also accept a return of any product in original condition for any reason within thirty 80 days of purchase Mail the product to our current address given on our website with a note explaining your dissatisfaction and requesting a refund Email info 5WitsProductions com Phone 781 551 3500 Web www 5WitsProductions com 5 Wits Productions is a full service design build company specializing in conceptualizing and fabricating interactive exhibits simulations challenges special effects and adventure exp
9. the device may cause it to detect Keep the sense wire as short as possible ideally a few inches in order to reduce the chance of errors Running the sense wire over long distances or near other wires can Cause unexpected behavior In all cases it is best to mockup your potential usage scenario and test ideally in the actual end use environment to ensure you will get the desired functional result www 5WitsProductions com 5 E PRODUCTIONS Notes on Power Supplies The touch sensor operates on voltages between 8 and 24 Volts DC It requires a minimum supply current of 100mA in that voltage range Supplying a lower voltage or current could cause the touch sensor to cease functioning or cause erratic behavior While regulated input voltage is always best the touch sensor has onboard voltage regulation and an inexpensive wall wart power supply in the acceptable voltage range will suffice The sensor may display erratic results when powered by a 9V battery or similar A wired power supply is a better choice as it provides a stable reference for capacitive sensing If you plan to use a battery test thoroughly in your application If your application requires the touch sensor relay output to be energized continuously for long periods of time measured in hours rather than minutes it is recommended that you use a power supply close to the low end of the acceptable range such as a9 or 12 VDC supply While the u
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