Time keeping on the ESP8266 is technically quite challenging. Despite being named RTC, the RTC is not really a Real Time Clock in the normal sense of the word. While it does keep a counter ticking while the module is sleeping, the accuracy with which it does so is highly dependent on the temperature of the chip.
\n\n\n\n \n \nwemos d1 mini power requirements

3. Connect your CC2531 Adapter. Once you've compiled and uploaded the CCLib_proxy to your wemos d1 mini board, unplug it from the USB bus. Now, get some (actually 5) jumper wires and connect your ESP board to the debug port of your CC2531 adapter. Since the ESP uses 3.3v, you don't need a voltage divider!

As for the relay it is proper to power it from a separate power supply. A relay need almost 100mA. As per his diagram, he appears to be using the WeMOS D1 in the "Arduino" format. This apparently has a proper on-board switchmode regulator for the 5 V.
One of the most used micrcontroller in my DIY projects is the ESP8266. But all ESP8266 boards like the ESP8266 NodeMCU or the WeMos D1 Mini have one mayor downside: They have only 1 analog input pin. But you can increase the number of analog inputs with an analog multiplexer. The charger claims to handle batteries with capacity from 4AH to 100AH, works from 100v-240v and has winter and summer modes as well as handling all the major types of lead-acid batteries. The unit weighs under 0.5Kg and measures a mere 22*11*4.5cm. Mine has a 2-pin EU plug, plastic construction and looks solid.

Wemos D1 Boards. Ai-Thinker ESP8266 modules (ESP-12F, black color) soldered to breakout boards (white color) This is the first series of modules made with the ESP8266 by the third-party manufacturer Ai-Thinker and remains the most widely available.[19] They are collectively referred to as "ESP-xx modules".

Shown is an example 3D render of an ESP32 based board using a Wemos ESP32 D1 board. An example of the D1 Mini ESP32 Wide Format. Here is an example of a printed PCB with a raw ESP8266 and an LM2596 module, for being powered by a GDO with the battery backup capabilities. An example of a PCB using a bare ESP8266 and LM2596 module. Schematic options
Please review my sketch. projects. BusDev March 14, 2019, 9:36pm 1. Hello, I am designing my second board, and as always appreciate if you can review the design. I am trying to make a simple temp sensor board connected to Wemos D1 Mini [ ESP8266] and have sleep mode on it. The battery i am using is 18650 li-ion style.
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