Simpson Vom

• http://www.simpson260.com
• http://www.simpson260.co ... impson_260-5.htm

I dug out my trusty Simpson to debug the SpinometerProject. I found I could read variables to two digits of accuracy which was enough to find my bugs.

Here is a meter test program I wrote to study the accuracy and linearity of this and other meters I've since used as ArduinoBoard output devices.

    byte steps[] = {0, 1, 2, 3, 4, 5, 4, 3, 2, 1};
    void loop () {
      meter(9, steps[millis()/1000L%10, 5);
    }
    void meter(int pin, float value, float scale) {
      float volts = value * 2.5 / scale;      // use 2.5v scale
      int pwm = volts * 255 / 4.82;           // output <= ~5v
      analogWrite(pin, pwm);
    }