Drawbot Zeroing


One thing I’d like to do is have my drawbot able to calibrate itself.

It’s easy to have an arduino read a button. Here’s another article.

So I figure I can have a couple of micro switches on the drawbot so each spool can be calibrated.

Perhaps a knot in the string can trigger a micro-switch. Or perhaps a colored spot on the string can be detected.

const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);

void loop(){
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
else {
// turn LED off:
digitalWrite(ledPin, LOW);