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Topic: FSR instead of Hall Sensor (Throttle Pedal) (Read 631 times) previous topic - next topic

esingd

Nov 27, 2012, 12:11 pm Last Edit: Nov 27, 2012, 05:04 pm by esingd Reason: 1
Dear Friends,

I would like to replace an accelerator/throttle pedal on a vehicle (for disabled people) with Force Sensitive Resistor, searched examples with Force Resistive Sensor and Arduino but could not find any suitable circuit. The original throttle pedal have hall sensor in it and when i read values with a scope and multimeter, the analog outputs of original part as following :

Pin 1 - Unpressed : 0.405 Volt
Pin 1 - Pressed : 0.458 Volt
Pin 3 - Unpressed : 0.204 Volt
Pin 3 - Pressed : 0.652 Volt

I have also figured out that a force of 0 to 1000 gr is applicable for this type of sensor.

All of the examples (http://www.sparkfun.com/datasheets/Sensors/Pressure/fsrguide.pdf) are with Op-amps but i would like to make it with Arduino so i would like to have a configurable setting for any voltage between 0 to 5V (eg: from 0.204V to 0.652V).

Any ideas and helps are appreciated with circuit design / code etc.

robtillaart

you can set the ANALOGREFERENCE to 1.1Volt that should be enough to notice the differences.

read -  http://arduino.cc/en/Reference/AnalogReference -

Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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