If you want to make a “permanent” job then you’ll need a soldering iron and 3D printer if you want to make the enclosure. Guide Hardware Serial.printf("Set json... %s\n", Firebase.RTDB.setJSON(&fbdo, parentPath.c_str(), &json) ? "ok" : fbdo.errorReason().c_str());

Of course its best to stay within published specification. but i failed to see the practicality of whole thing. Considering this is ultra portable module, it should be able to powered up from a battery. But how? As per the specification 5v pin takes 4v to 6v and 3.3v pin takes 2.58v to 3.6v. While a lithium cell battery outputs .3.5v to 4.2v. Hence its unsafe to connect to 3.3v pin as battery voltage can be higher than 3.6v. And unsafe to connect to 5v pin as battery voltage can be lower than 4v. 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. The world has changed a little bit in the past couple of weeks/months depending on where you live with a global pandemic currently on-going, meaning more and more of us are currently spending a lot more time indoors that we would either like or are used to thanks to the Coronavirus/COVID-19 situation. First we need to connect the DS18B20 to the Wemos D1 Mini (or whichever board you are using) which is simple, it requires just 3 connections – 3.3v/5v, Ground and Data. The d1 mini is an ESP8266 development board that is compact, versatile and very easy to use with the Arduino IDE. It supports natively by the Expressive SDK.This mini board combines the popular form factor of the D1 Mini with the high performance ESP32. This means that you do not have to do without functionality even in the smallest of spaces. 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 To blink the onboard LED of a D1 Mini board you can program it like an Arduino board. Once you add support for the board to the Arduino IDE, you can write and run a simple blink example. Select the location or room where you are going to install and use the weather station and tap the Continue button. When the 5V pin is coupled to a 5V supply, the Wemos D1 Mini will be powered from an external 5V supply.

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. 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. First of all, install the latest CH340G driver in your Windows computer. After successful installation, connect WeMos D1 mini module to the computer USB through a micro USB cable (the so called android cable) and ensure that it’s appeared there in the Device Manager. Just connect an USB cable to your board - that's all (since the units have onboard UART controllers). Here, I’m going to assume that you already have at least version 1.6.9 of the Arduino IDE installation in your Windows computer.The easiest way to identify the wires on the DS18B20 I’ve found is to have the flat of the sensor facing you (its a half circle) then from left to right it goes Ground, Data, VCC. The resistor should be placed between VCC and Data:

The Wemos D1 Mini does not have bluetooth built in as the ESP chip does not have the functionality.

The input impedance at A0 is 330Kohm (probably true for all such boards), so if you want to increase the max voltage further, you can add a resistor in series with A0 R = Vmax * 100-330 K. As I said previously if you want to decrease the Vmax with a little soldering* skill you can attach a resistor directly to the analogue input pin of the chip itself R = Vmax*100 – 100 K. There are several types of D1 boards available. There is in fact a ‘full sized’ D1 board available, albeit far less common. 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.

This is D1 Mini V2 NodeMcu 4M Bytes Lua WIFI Internet Of Things Development Board Based ESP8266, it is a mini WIFI board based on ESP-8266EX. 11 digital input/output pins, all pins have interrupt/PWM/I2C/one-wire supported(except D0) 1 analog input(3.3V max input) and a Micro USB connection. If you are looking to use your Wemos D1 Mini in a smart home setup, you should consider flashing it with Tasmota or ESPHome.The form factor is tiny, making it possible to embed the Wemos D1 Mini into many different projects. It is also easy to hide it in your house should you want to use it for a sensor. 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