Five reed switches and ESP8266 NodeMCU
Posted: Mon May 30, 2022 2:51 pmHi! I have an ESP8266 NodeMCU dev board and five reed switches. I would like to be able to detect when each of them may be disconnected (got a normally open one, default position is magnet next to reed switch.)
From what I can gather online, it looks like people like to use external resistors to connect the reed switch to their board, but I also read that several GPIOs on this board has internal pullup resistors.
My questions are:
- which GPIO pins should I use as INPUT_PULLUP for the five reed switches;
- how should I wire them up -- if I need an external resistor per switch, how much should I use?
- lastly, has anyone tried something like this but using ESPHome with Homeassistant?
Thank you so much and sorry for my noob question!
From what I can gather online, it looks like people like to use external resistors to connect the reed switch to their board, but I also read that several GPIOs on this board has internal pullup resistors.
My questions are:
- which GPIO pins should I use as INPUT_PULLUP for the five reed switches;
- how should I wire them up -- if I need an external resistor per switch, how much should I use?
- lastly, has anyone tried something like this but using ESPHome with Homeassistant?
Thank you so much and sorry for my noob question!