Introduction: How to Make Super Cheap Flex Sensor
If you ever wanted to make an animatronic hand that is controlled by your own hand and thought that paying around $10 for just one flex sensor is a bit too much, then this instructable is for you.
- a piece of IV tube
- electrician's tape
- red LED
- 1 kOhm resistor
- 10 kOhm resistor
- modelling balloon
Step 1: Grab Your IV Tube
Step 2: Insert the LED Into the Tube
Step 3: Sercure the LED With Electrician's Tape
Step 4: Do the Same With the Photoresistor
Step 5: Wrap It in Tape and Put the Cut Ballon Over It
The light will be travelling through the tube and the more bent it is the less light will be getting onto the photoresistor thus increasing its resistance.
Now you will need to connect it like you normally connect a LED and a photoresistor but use the 1 kOhm resistor for LED to make it less bright as the light should not escape the insulation for best results.
Note: if you are going to use more then one of them, use the same color of LED because photoresistor reacts differently for different wavelenghts.