One of my students is working on a flex sensor, so I thought I would share some of the code.
int myInA0 = 0;
void setup() {
pinMode(D7, OUTPUT); // onboard LED
pinMode(A4, OUTPUT); // PWM
//pinMode(A0, INPUT_PULLDOWN); do not set analogRead
digitalWrite(D7,HIGH);
delay(1000);
digitalWrite(D7,LOW);
}
void loop() {
delay(10);
myInA0 = (analogRead(A0)-660)/10; // you decide the subtraction and division
if (myInA0 <= 0) {myInA0=0;}
if (myInA0 >= 250) {myInA0=250;}
analogWrite(A4, myInA0);
}
The resistor in the voltage divider is 100K ohm. The weird circuits items are called SNAP circuits 750 from Elenco. Bend the flex sensor and the red LED becomes brighter.
