ESP32 Board with Battery Charger

Description

Compact open-source development and prototyping board based on the ESP32 (ESP-WROOM-32) that integrates Wi-Fi 802.11 b/g/n, dual-mode Bluetooth (classic and BLE), 26 GPIOs, a charging circuit for lithium polymer batteries, and a micro USB connector.

Supports data rates up to 150 Mbps, has an antenna output power of 20.5 dBm for maximum range, and a sleep mode consumption of only 5 µA.

It also provides interfaces for temperature sensors, touch sensors, SD card, UART, SPI, SDIO, I2C, LED PWM, Motor PWM, I2S, IR, micro USB connector, and a reset button.

It can be used in a wide range of applications such as: wearable devices, low-power sensor networks, audio headsets, smart plugs, home automation, mesh networks, industrial wireless control, wearable electronics, etc.

Programmable with the Arduino IDE.

Note: the board is supplied pre-assembled except for the male strip connectors.

ESP32 Block Diagram

Technical Specifications

• CPU and Memory
  – Xtensa® single-/dual-core 32-bit LX6 microprocessor(s), up to 600 DMIPS
  – 448 kB ROM
  – 520 kB SRAM
  – 16 kB SRAM in RTC
  – 4 MB Flash memory
• Wi-Fi
  – 802.11 b/g/n HT40 Wi-Fi transceiver, baseband, stack, and LwIP
  – Sniffer / Station / SoftAP and Wi-Fi direct modes
  – Maximum data rate 150 Mbps@11n HT40, 72 Mbps@11n HT20, 54 Mbps@11g, and 11 Mbps@11b
  – Maximum transmit power 19.5 dBm@11b, 16.5 dBm@11g, 15.5 dBm@11n
  – Minimum receiver sensitivity -97 dBm
• Bluetooth
  – Compliant with Bluetooth v4.2 BR/EDR and BLE specifications
  – NZIF receiver with -97dBm sensitivity
  – Class 1, Class 2, and Class 3 transmitter
  – Transmit power +12dBm
  – NZIF receiver with -97dBm sensitivity
  – Multi-connections Bluetooth and BLE
• Clocks and Timers:
  – Internal 8 MHz oscillator with calibration
  – Internal RC oscillator with calibration
  – External 2 MHz to 40 MHz oscillator
  – External 32 kHz oscillator for RTC with calibration
  – Two timer groups, including 2 64-bit timers and 1 main watchdog in each group
  – RTC watchdog
• Peripheral Interface (26 GPIO):
  – 12-bit SAR ADC up to 18 channels
  – 2 8-bit A/D converters
  – 10 touch sensors
  – Temperature sensor
  – 3 for SPI, 2 for I2S, 2 for I2C, 2 for DAC, 3 for UART
  – 1 host (SD / eMMC / SDIO), 1 slave (SDIO / SPI)
  – Ethernet MAC interface with dedicated DMA and IEEE 1588 support
  – CAN 2.0
  – IR (TX / RX)
  – Motor PWM, LED PWM up to 16 channels
  – Hall sensor
  – Ultra-low-power analog pre-amplifier
• Battery charging for lithium polymer batteries:
• Power supply: 3.3 V

Documentation and Useful Links

• ESP32 Details
• ESP32 Forum
• ESP32 Datasheet
• GitHub
• Schematic V1.0.0