Measuring Tape Prototype

1// Length measurement using a soft potentiometer.
2// Keyboard input  of the received length (value in inches).
3#include <Keyboard.h>
4
5#define  BUTTON_PIN 7
6#define TAPE_PIN A0      // Pin connected to softpot wiper
7#define  TAPE_LENGTH 200  // Softpot length in tenths (1 tenth = 1/10 inch)
8
9void setup()  {
10  pinMode(BUTTON_PIN, INPUT);
11  pinMode(TAPE_PIN, INPUT);
12  Serial.begin(9600);  // debug
13  Keyboard.begin();
14}
15
16void loop() {
17  if (digitalRead(BUTTON_PIN)  == HIGH) { // if the button is pressed
18    int x = analogRead(TAPE_PIN);        //  Read the value from the sensor (0-1023)
19
20    if (x > 0) {
21      float d  = map(x, 0, 1023, 0, TAPE_LENGTH); // Map the 0-1023 value to 0-TAPE_LENGTH
22      float l = d / 10;  // Convert length to inches
23
24      Serial.println("measured  length: " + String(l) + " inches"); // debug
25
26      Keyboard.print(l);  // Input value
27    }
28    delay(500);
29  }
30}