ESP32_Bat Battery Charging Breakout and Development Board

ESP32 Dev Board WiFi+Bluetooth with Onboard LiPo Charger, CP2104 USB to Serial. Arduino Programmable.  Designed and Made in the USA

Here is the ESP32 development board with integrated LiPo cell charger. Made in and ships from the USA. Other than the ESP32E module it has an Si Labs CP2104USB to Serial converter, A 3.3V LDO, Reset and Flash Switches and a multi color LED.

An improved version of the board with integrated LiPo fuel gauge is available here.

The board uses the latest ESP32-WROOM-32E module .

The Deep Sleep current is less than 10uA from the cell.

There are two tri-color LEDs on the board. One has the red and green LEDs hooked up to the CP2104 to signal transmit and receive activity and is powered from the USB connector. The other tri-color LED is connected to three IO pins on the ESP32 module.

The board supports auto-download from the Arduino environment and will automatically be set in download mode by the downloader. Once the download is complete the board will be reset, just like a normal Arduino board.

All the required capacitors and pull-up resistors are fitted on the board. The board can be powered from an external power supply of up to 6V or the USB connector or both.

When external power is present the cell is charged with a 400mA charge current to a 4.2V cutoff voltage.

When the external power is present and the cell discharges the cell will automatically be re-charged.

An LiPo cell or SuperCap must be connected to the battery connector for the board to operate correctly as a WiFi transmitter.

Boards purchased without a cell will receive the matching charge cable.

The Cell connector is a JST2R commonly used on LiPo cells.

Unlike most other boards this one fits on a breadboard and has one row of pins accessible on each side of the board. Most of the pins of the ESP32 module are available on the external pins.

The module can be programmed directly from the Arduino environment without pushing any buttons. The upload speed is 921600 bps.

The module has been designed to be used in Sleep mode without excessive current draw.  I read 12uA when powering from the Vin and Gnd pins.with the processor in deep sleep mode.

The overall dimensions and pinout is identical to the other ESP32 boards on this site.

The schematic is available here.

• 240 MHz dual core Tensilica LX6 microcontroller with 600 DMIPS
• Integrated 520 KB SRAM
• Integrated 802.11BGN HT40 Wi-Fi transceiver, baseband, stack and LWIP
• Integrated dual mode Bluetooth (classic and BLE)
• 4 MByte flash
• 3V to 6V operating voltage on the Vbat terminals if the battery is not used
• On-board PCB antenna
• On-board 32.768kHz Crystal
• 3 x UARTs, including hardware flow control
• 3 x SPI
• 2 x I2S
• 12 x ADC input channels
• 2 x DAC
• 2 x I2C
• PWM/timer input/output available on every GPIO pin
• SDIO master/slave 50 MHz
• Supports external SPI flash up to 16 MB
• SD-card interface support
• 32.762 kHz  crystal and capacitors fitted