Arduino program to test nuvinci hub

nuvinci.cpp

#include <Wire.h>
#include <Adafruit_MCP4725.h>


Adafruit_MCP4725 dac;

volatile int counter = 0;

void setup(void) {

  Serial.begin(57600);
  Serial1.begin(57600);

  pinMode(2, INPUT);  // tach on pin 2

  attachInterrupt (digitalPinToInterrupt(2), MyISR, FALLING);

  dac.begin(0x60);    //  address for BangGood device was 0x60

  delay(1000);

  Serial1.println("start");
}



void loop(void) {

  for (int i = 0; i < 42; ++i) {
    int gear =  100 * i;
    if (gear > 4096) gear = 4096;
    dac.setVoltage(gear,false);
    delay(2000);  // time to run up;
    noInterrupts();
    counter = 0;
    interrupts();

    delay(500);

    noInterrupts();
    int rpm = counter * 60;   // 500ms  2 magnets  2 pulses per revolution
    counter = 0;
    interrupts();

    float mph = ((rpm * 63.0 / 12.0) * 60.0) / 5280.0;

    Serial.print(gear);
    Serial.print("\t");
    Serial.println(mph,2);

    Serial1.print(gear);
    Serial1.print("\t");
    Serial1.println(mph,2);
  }
  Serial1.println("end");
}

void MyISR(){
  ++counter;
}