![]() ![]() That's boards like the Leonardo, some of the smaller (mini? micro? I forget which) boards, etc.In this Instructable I will guide you through the steps needed to install, configure and program the WeMos-D1R2 board using the Arduino IDE. Boards that have a direct USB connection don't use the TX and RX pins for uploading sketches - they use the dedicated USB D+ and D- pins. No, only those that use a USB to Serial bridge chip - that's things like the Uno, Due, Mega, etc. You can also use the same trick with other devices you wire up to those pins - add a double-pole-single-throw or double-pole-double-throw (and not use one position) to easily isolate both pins from the rest of your hardware when you need to. Many shields now are starting to add a small switch on them to disconnect those pins so you can upload sketches without unplugging the shield. Just disconnect those two pins from whatever is connected and you will be able to upload sketches again. It's not your sketch that's interfering with the serial, it's what is physically connected to those two IO pins that are interfering.
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