ESP32 – WIFI + bluetooth development board

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), and 25 GPIOs.

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

It also features interfaces for temperature sensors, touch sensors, SD card, UART, SPI, SDIO, I2C, LED PWM, Motor PWM, I2S, IR, a micro USB connector, a Boot button, 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. Dimensions (mm): 51.45 x 28.33 x 14.

Programmable with the Arduino IDE, it includes interpreters for processing commands in languages such as Lua.

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 a sensitivity of -97 dBm
  – Class 1, class 2, and class 3 transmitter
  – Transmission power +12 dBm
  – NZIF receiver with a sensitivity of -97 dBm
  – Multi-connections Bluetooth and BLE
• Clocks and Timers:
  – Internal 8 MHz oscillator with calibration
  – Internal RC oscillator with calibration
  – External oscillator from 2 MHz to 40 MHz
  – 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 (25 GPIO):
  – 12-bit SAR ADC up to 18 channels
  – 2 8-bit D/A 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
• Security:
  – Standard IEEE 802.11 security features supported, including WFA, WPA / WPA2, and WAPI
  – Secure boot
  – Flash encryption
  – 1024-bit OTP, up to 768 bits for customers
• Programming:
  – Press the “boot” button during programming.

Documentation and Useful Links

• ESP32 Details
• ESP32 Forum
• ESP32 Datasheet
• Installation procedure in the Arduino IDE