Please note that you can totally get away without doing this, but I just found it too annoying to re-plug every one of the 6 jumpers every time and making sure none would fall out of the breadboard in the process etc. These are the required connections needed to be made via jumpers or on prototype board So, as I like to do that anyway, I pulled out a fresh proto-board from my drawer and some female headers to build an adapter: The first issue was the hassle of the jumper cable wiring that needs to be done to program the ESP-01 and having to re-do it every time you test your new firmware (detach all jumper wires and plug the ESP into the relay board). On one side, I didn’t want to use the pre-loaded firmware because of bugs or security issues that I can’t know about if it’s pre-flashed and on the other side, it just seemed not to work (for whatever reason). Today, I’ll share my experience (and - spoiler - success □) of trying to get a ESP8266 WiFi 5V 1 Channel Relay going. ESP-01 / ESP8266 5V 1 Channel Relay Setup
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