ESP32 CoinCell board

ESP32 CoinCell board


This is an ESP32 Pico D4 project with an accelerometer and 0.69″ oled display powered by a rechargeable LIR2450 coin cell. Source files are available on Mike Rankin writes:

I was not made for any specific purpose and was a design challenge to try and made it as small as possible. It can be powered off of a battery or USB cable. If a battery is inserted and USB cable is plugged in it will charge the battery and power the board. The design files and parts list is provided if you would like to assemble your own. I can assemble and sell them in small quantities but the price would be very expensive. If you can come up with a specific use for this hardware or have any questions then just let me know at @mikerankin or by email at

Main components used in this desgin:

  • ESP32 Pico D4 (wifi/bluetooth processor)
  • LIR2450 (3.7V battery)
  • SE5218ALG-LF (500mA LDO power supply)
  • SL4054ST25P (LiPo battery charger)
  • LIS3DHTR (accelerometer)
  • CP2102N (USB interface chip)
  • ER-OLED0.69-1W (96×16 oled dsiplay)

Overview Video

ESP32 CoinCell board – [Link]

About mixos

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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