The official boards are produced by Lolin who are seemingly based in China, or at least their official store can be found over on Aliexpress.

Open “File>Examples”. In examples of ESP8266 (or in D1_mini_Examples), just select the “Blink” program. Uploading that example sketch to WeMos D1 mini board blinks its onboard blue LED (see test video). GPIO6 to GPIO11 are usually connected to the flash chip in ESP8266 boards. So, these pins are not recommended to use. Pins used during Boot

The Wemos D1 Mini has an onboard voltage regulator. This may vary between the versions and also if the board is a clone. The 3.3V pin will output 3.3V from the voltage regulator. If used to power any external devices, the maximum current supplied from the regulator should be observed. 3.3V from the 3.3V input pin Yes, the bare chip has a maximum voltage of 1v, of course it is possible to increase that with a simple potential divider network (2 resistors, one of which is probably already on your chip/board). Some of the development boards add a potential divider network usually to make the sensitivity 3.3v at the A0 pin, I only have direct experience of the NodeMCU board where this is the case, but it might also be true of the products you mention. We hope you’ve found this guide for the ESP8266 GPIOs useful. If you have some tips on how to use the ESP8266 GPIOs properly, you can write a comment below.

The ESP8266 requires 3.3V to operate, therefore all iterations of the Wemos D1 Mini and other boards using the ESP8266 chip must have 3.3V onboard to function. One important thing to notice about ESP8266 is that the GPIO number doesn’t match the label on the board silkscreen. For example, D0 corresponds to GPIO16 and D1 corresponds to GPIO5.

Next step

You have two possibilities to power the ESP8266 WeMos D1 Mini in a save way and one additionally possibility that I do not recommend. And upload via USB or OTA. Watch the console again and this time you should start to see some temperatures being outputted every 30 seconds: [D][sensor:092]: 'Bedoom Temperature': Sending state 19.06250 °C with 1 decimals of accuracy This should be considered if using the Wemos D1 Mini to power an external sensor from the 3.3V pin. Care must be taken not to overload the onboard regulator. Does The Wemos D1 Mini Have Bluetooth? I’ll show you how to take a DS18B20 temperature sensor and add it to Home Assistant for some really accurate and reliable temperature readings. Parts List The project also seems to be available on EasyEDA, along with schematic and other useful files, should you be interested in building your own. Wemos D1 Mini Bluetooth Shield on EasyEDA How To Program The Wemos D1 Mini

Micro USB: The most popular and the easiest way to power the microcontroller is via USB cable. The standard USB connection delivers 5V and allows you to draw 500mA in total. However it is possible to connect the Wemos D1 Mini to a Bluetooth module, adding Bluetooth functionality. Arduino compatible Bluetooth modules such as the HC-05 would be ideal for this. The 3.3V voltage regulator will not operate. The ESP chip will receive 3.3V directly from the external power source. Not sure about the wisdom of this (may not be legal in your jurisdiction), but I have some old leaded solder (left over from my youth before health and safety) it melts about 20 degrees lower than unleaded, so if you set your regulated iron to coolish, its great if you want to tweak boards with surface mount components without risk of disturbing anything. ReplyMakerFocus 2pcs D1 Mini NodeMcu 4M Bytes Lua WiFi Development Board Base on ESP8266 ESP-12F N Compatible NodeMcu Arduino