TO DO: -Move input buttons to pin 2 and to pin 3 to prepare them to be used via INT0 and INT1 for faster protection and control -evaluate the possibility to set voltage while STOP and Current limit while RUN -test the proper External Reference Voltage by comparing the reading of ADC BEFORE and AFTER setting it with a known value -lower the Current measurement resistor to milliOhm and measure the voltage drop with a precision comparator or opamp for greater resolution at low current

/*

• Voltage divider
• R7 from +V to ADCin = 50.1 kOhm
• R6 from ADCin to GND = 10.18 kOhm
• External voltage reference measured 4.947V
• D8 > protection relay
• D9 > informational LED
• V_1.8 - ICONs added for RUN/STOP
• V_1.7 - RUN/STOP function optimisation. Blink SLOW and blink FAST added for the two state. SW version on LCD
• V_1.6.1 - Move fixed text to EEPROM for space
• V_1.6 - Digital potentiometer in circuit
• V_1.5 - Free the pins for SPI potentimeter. Relay to D4, LED to D2.
• V_1.4 - Reading potentiometer. Set value from potentiometer
• V_1.3 - Format the readings for output, send it on Serial at preset time as in SETTINGS
• V_1.2 - added millis for LCD Display to avoid flicker and for LED to blink, dunno why.
• v_1.1 - Button on pin 12 and LED on pin 9. Both to ground
• V_0.9 - Power output relay on D8 pin

•   - HW > DC/DC Step down
  

• V_0.8 - Introducing timed LCD showing
• V_0.7 - DEBUG to serial added as separate function.

•   - Some housekeeping
  

• V_0.6 - LCD added

*/