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Step 7Visualizing
To see how your pressure sensor works we will need to include it in a simple electronic circuit.
If you happen to be working a lot with poppers and circuits you might like to modify a set of crocodile clips to have poppers on one end. Otherwise you can just clip on to the poppers.
To visualize with a multimeter, create the following setup (see pictures)
Set multimeter to measure resistance (in Ohm).
Multimeter plus to one side of fabric pressure sensor (doesn't matter which side) and multimeter minus to other side of fabric pressure sensor. Apply pressure and watch the resistance value change. You might have to adjust the range if you don't see anything. If you have a constant connection then either you forgot to put the Velostat in between or somewhere your two pieces of conductive thread are touching. Ops.
To visualize with an LED or vibration motor, create the following setup:
Connect the plus of two AA batteries or a 5V source to one side of the pressure sensor (doesn't matter which side) and connect the other side of the pressure sensor to the plus of an LED or either side of the vibration motor (switching plus minus only affects the direction of the vibration motor, whereas an LED only works in one direction). Connect the minus of the LED or the other other side of the vibration motor to the minus of the power supply.
Apply pressure to the fabric pressure sensor and control the brightness of the LED or the strength of the vibration.
In the video I have hooked up the pressure sensor to an arduino (www.arduino.cc) and am visualizing the change in resistance with a simple application written processing (www.processing.org).
For Arduino microcontroller code and Processing visualization code please look here >> http://www.kobakant.at/DIY/?cat=347
ENJOY!
If you happen to be working a lot with poppers and circuits you might like to modify a set of crocodile clips to have poppers on one end. Otherwise you can just clip on to the poppers.
To visualize with a multimeter, create the following setup (see pictures)
Set multimeter to measure resistance (in Ohm).
Multimeter plus to one side of fabric pressure sensor (doesn't matter which side) and multimeter minus to other side of fabric pressure sensor. Apply pressure and watch the resistance value change. You might have to adjust the range if you don't see anything. If you have a constant connection then either you forgot to put the Velostat in between or somewhere your two pieces of conductive thread are touching. Ops.
To visualize with an LED or vibration motor, create the following setup:
Connect the plus of two AA batteries or a 5V source to one side of the pressure sensor (doesn't matter which side) and connect the other side of the pressure sensor to the plus of an LED or either side of the vibration motor (switching plus minus only affects the direction of the vibration motor, whereas an LED only works in one direction). Connect the minus of the LED or the other other side of the vibration motor to the minus of the power supply.
Apply pressure to the fabric pressure sensor and control the brightness of the LED or the strength of the vibration.
In the video I have hooked up the pressure sensor to an arduino (www.arduino.cc) and am visualizing the change in resistance with a simple application written processing (www.processing.org).
For Arduino microcontroller code and Processing visualization code please look here >> http://www.kobakant.at/DIY/?cat=347
ENJOY!
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