You can also use the official flash download tool here, but it requires many more steps. I used this updater on Windows and it worked great (it’s all in Chinese though). Many features (like using Deep Sleep to conserve battery) will not work properly without newer firmware. Next, you should update the ESP8266 firmware. On Windows, the USB ports start with “COM”, and on Mac, they start with “/dev/tty”. This can be done via Device Manager on Windows or directly via the Arduino > Tools > Port menu on Mac. You’ll then need to identify the computer name of the port you connected to. The safest bet is to use a primary power+data USB port directly on your computer. To connect the module to your computer, you need to plug the ESP-01S into a USB programmer (overhanging towards the USB connector) and flip the switch to PROG beforehand. I wish I had read (or at least skimmed) this guide before diving in. Setting up the ESP8266 for Programmingīeing new to Arduino/ESP8266, I had to overcome some initial hurdles. You could also save a lot by going through Ali Express (I’ve heard ElectronicFans is a good store for this), but I prefer the convenience of Amazon. The total cost comes to about $12 per button (not including the USB programmer).
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