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Arduino

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  • Might need transistors between the Aduino and the ESP8266 to break the Rx/Tx lines. Otherwise they could go higher (due to the USB interface on the Arduino, which is connected to D0/D) then the ESP8266's VCC pin and could damage the diode clamp's on the ESP8266 inputs, or possibly appear to phantom power it. Commented May 7, 2018 at 18:39
  • I will try to find one that suits my needs and try it out. Regarding the tx/rx lines I set them both to LOW and INPUT before cutting the power. Would that be enough or will the above still be an issue? Commented May 7, 2018 at 19:09
  • That is good. That is really all you need to do. Commented May 7, 2018 at 19:20
  • In my case VCC will be 3.3V and since GPIO is also from the same power source it will also be 3.3V. Also, once the circuit is cut off from power, I would like to put the attiny85 in sleep mode and not use any power for a while. If I understand this correctly, a P-channel MOSFET needs power to cut the power, is that correct? With this in mind, is this component still the one I want? Sorry, I might not have explained this very well in my question. Commented May 7, 2018 at 19:32
  • It needs a voltage. No (or miniscule) current though. The gate is like a capacitor. Once charged it doesn't draw anything to speak of - only tiny leakage current too small to measure. Commented May 7, 2018 at 19:35