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10. input devices (Apr 2, 2014)
Measure something: add a sensor to a microcontroller board
that you've designed and read it
In this week assignment, I tried to make a pressure sensor with
force sensing resistor (FSR).
Force Sensing Resistor (FSR).
FSR is a polymer thick film device which exhibits decreasing
resistance with increasing force.
Resistance vs. force curve. The data is plotted on
Before making the board, I used the Arduino to check whether FSR
works or not. I referred to pp.136-139 of the book Prototyping
Lab (O'Reilly Japan, 2010).
Screen capture of Arduino IDE.
Turn-on. LED lights.
Then I engraved the PCB board (hello.load.45) and soldered some electronic
components to the board.
After burning bootloader, I compiled and wrote the code into the
board. I measured a pressure with the force sensor.
Turn-off(left). Turn-on (right)