Legal Removal Request This form is for reporting content posted on the AB Electronics UK forums that you believe violates your personal legal rights or applicable local laws for your country. Post: Hi Andrew Thank you for your explanation, makes more sense to me now, to know how the resistor would interact with the IO Pi and how the IO Pi deals with input current limiting etc. I wondered similar to that in that the IO Pi maybe outputting 5V especially in the case when it was switched on. What is the IO Pi's main default starting state, so soon as power is applied, are the pins outputting 5V or does it literally do nothing until code is run to control the function of the pins? When I checked the output voltage from the sensor, it was around 4.95V, I was measuring between the 5v output from the sensor and the ground on the power supply that also runs the 5v supply through the relay in the sensor, that then goes out the sensor and connects to the IO PI Plus as an input. I will check the grounds later, I think may need to review that. I had wondered if maybe the chips on the board were faulty as it randomly occured, we can try rule the board out. Yes if you could send it to my address on the previous order, that would be great, many thanks. Do you need any order confirmations or anything? The sensor itself doesn't have a ground for the 5V side, the connections to the sensors are 24V DC IN, Earth, Relay Common(5V input from power source), Relay Sensor Sense/Detect Out(5v to IO PI Plus as an input), Relay Sensor No Sense/No Detect Out(5V Out, this terminal is for when no motion is detected, not currently wired to anything) The 5V input to the sensor relay common terminal and then out to the IO Pi comes from the switch mode power supply. The circuit is 5V loop in through the relay in the sensor and then out to the IO Pi, the ground from the 5V supply isn't used with the sensor. I can still wire it as you have drawn up however the ground between the resitsor and sensor on the left side is not present. I have attached a modified version of your diagram, would this work ok with those two 10K resistors wired like that, without a ground to the sensor? [img]/docs/forumpost/jbjompn.png[/img] If you need me to take any photos of the pins outs of the sensors and or setup, etc, please let me know. Many thanks Rhys Select the country where you are claiming legal rights. 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