The D1 Mini board is part of a family of open hardware devices. Not all devices look or act the same but they are based on the same chipset. So if you are using a different device you may get different results. Always remember to first install the drivers for the UART before plugging it to your computer! Software It is possible that a single ADC channel may not be enough for some projects, but this is a limitation of any board based upon the ESP8266. Select the location or room where you are going to install and use the weather station and tap the Continue button.

The full sized board is also compatible with the Arduino UNO shield form factor, so this board can be useful if you already have this type of shield. Full-size D1 Board It has sixteen pins as shown and follows the same naming scheme as the NodeMCU. However, unlike the NodeMCU, it has one pin that can produce 5V. Moreover, each of the I/O pins run at 3.3V so if you want to use it with 5V devices, you need a level shifter. Setting Up the Arduino IDE for the WeMos D1 Mini The main different between these boards is the amount of flash memory. The D1 Mini features 4MB where the D1 Mini Lite features 1MB. Wemos D1 Mini Lite Connect the micro USB cable to the D1 Mini or NodeMCU and on your iPhone, iPad, or MacBook, open the Home app. Then follow these steps to add the HomeKit-enabled DIY weather station as an accessory to the Home app. The weather station we made will be recognized and added as an unofficial accessory. However, it will work similarly to an official Elgato Eve Degree sensor for Apple HomeKit. Next, go to “Tools>Board>Board Manager” in your Arduino IDE, select “esp8266 by ESP8266 community” from the dropdown list of available boards, and continue the installation process.

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The ESP8266 can be prevented from booting if some pins are pulled LOW or HIGH. The following list shows the state of the following pins on BOOT: The official boards come in two flavours, the D1 Mini and the D1 Mini lite. The latter is based on the ESP8285 chip where the former is based upon the more common ESP8266EX. Wemos D1 Mini

As you can see here, core component of the WeMos D1 mini (v2.2.0) is the ESP-12S Wi-Fi enabled controller mounted at the top of the module. There’re a number of other components at the bottom of the module (see next figure) including one CH-340G chip and a 3.3V linear voltage regulator. Also see two rows of connection/header points, one reset key, and a micro USB female connector. During a WiFi scan with a 5V power supply the current consumption of the ESP8266 WeMos D1 Mini is 68mA. Unfortunately, I measured a higher power consumption of 72mA with an empty Arduino script and a 5V power supply. Currently I have no explanation why the power consumption of the WeMos D1 Mini with an empty script is higher as during a WiFi scan. If you have any suggestions, let me know in the comment section under this tutorial. Additionally, the other GPIOs, except GPIO5 and GPIO4, can output a low-voltage signal at boot, which can be problematic if these are connected to transistors or relays. You can read this article that investigates the state and behavior of each GPIO on boot. Tap on the More Actions… button and then tap on the discovered temperature/humidity sensor accessory.The technical specification of the Wemos D1 Mini is really defined by the specification of the ESP8266 chip. The 5V pin will output 5V from the USB VBUS. If used to power any external devices, the maximum current supplied from the USB port should be observed. 5V from the 5V input pin When the 3.3V pin is coupled to a 3.3V supply, the Wemos D1 Mini will be powered from an external 3.3V supply. Once complete, just select the type of WeMos D1 board from the “Tools>Board” menu of your Arduino IDE to upload your first program. You can select “WeMos D1 R2 & mini” as the board. Remember to select the right port to which the board is connected in the “Tools>Port” branch. The maximum input voltage of the ADC0 pin is 0 to 1V if you’re using the ESP8266 bare chip. If you’re using a development board like the ESP8266 12-E NodeMCU kit, the voltage input range is 0 to 3.3V because these boards contain an internal voltage divider.

Run the above config and watch the console, you will see an output like this: [C][logger:175]: Logger: 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. 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 Lolin has however developed their own form factor. The Wemos D1 Mini board is approximately 1/4 the size of the Arduino UNO!

Step 6: Upload the code to the D1 Mini

It is also possible to add a Bluetooth module by means of a plug-in shield. This would by far be the easiest way to add Bluetooth, but it seems that this potential product still remains as a project. Superhouse’s Bluetooth Shield Project You have two possibilities to power the ESP8266 WeMos D1 Mini in a save way and one additionally possibility that I do not recommend. With a microUSB cable, connect the WeMos D1 Mini to your computer then select the correct board on Tools > Board: 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