# Arduino DigitalRead Generating Strange Results **URL:** \ **Category:** Arduino\ **Created:** [29 June 2020 00:53 UTC](https://forum.core-electronics.com.au/t/arduino-digitalread-generating-strange-results/7924 "2020-06-29T00:53:47Z")\ **Posts on this page:** 1\ **Showing post:** 25
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [1 July 2020 23:05 UTC](https://forum.core-electronics.com.au/t/arduino-digitalread-generating-strange-results/7924/25 "2020-07-01T23:05:57Z")
Hi Claude, The GV300W outputs use a method common in electronic equipment. The output relies on external equipment to provide voltage and resistance. … While writing this reply a thought occurred to me. … An electronic circuit needs to be a loop. Current needs to flow through the circuit from the supply to the ground. If this does not occur the voltage is said to float; the results could be as you have experienced. It could also explain why it works with one output connected but not with 2 or 3. How exactly is the Arduino connected to the GV300W ?? The GND of the Arduino needs be connected to the GND of the GV300W. (see pic below) pin 7 OUT3 to Arduino pin pin 8 OUT2 to Arduino pin pin 14 OUT1 to Arduino pin pin 6 GND to Arduino GND When connected like this there will be a complete loop for current flow. The Arduino ground will be referenced to the GV300W ground. It will not be floating. (see UNO pic below, GND pins) Regards Jim ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/e/ed93415808c5429ea892ea7a11bcecb755b89e0b.png) ![Image2](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/6/63ff0bba831c94b102ac893903c1129260cfc6a6.jpeg) --- _[View the full topic](https://forum.core-electronics.com.au/t/arduino-digitalread-generating-strange-results/7924)._