Below circuit diagram is what we ended up using for our final product.
We dropped the breadboard and connected and solder straight to the Arduino board since we circuit wasn't too complicated.
Force Sensing Resistor
Servo Actuator
(The servo is attached in the back of bubble gun to trigger with a piano wire for our final version)
Connecting Two Arduinos
To connect the two Arduinos, we used this tutorial from Arduino website.
We tried with a breadboard first, and then connected the two Arduinos directly after finding out that the connection was successful.
For the force sensing resistor for our pillow, we added additional layers to the sensor so it would be easier to detect the hug from all sides of the pillow.
We tried a few different methods for enhancing the FSR.
First, we added cardboards on both sides of the FSR to protect the sensor from bending or sensing unnecessary pressure. And then, we wanted some kind of bulky layer that could help to detect the hug from all sides. We tried inflated plastic zipper bags, air-filled packaging pillows, and foams with a few different firmness levels.
(Our trials with different types of inflated plastic bags)
For us, firm foams worked the best so we decided to go with the two cardboards on both sides and the foams.
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