SparkFun RedBoard IOT ESP32

[last updated: 2023-04-04]
ESP8266 & ESP32
project: radar breakout
(link to:) SparkFun product page
(link to:) RedBoard Startup guide

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• Features:
  • MCU: ESP32-D0WD-V3 chip
  • two CPU (individually controllable), and CPU clock is adjustable from 80 - 240 MHz.
  • USB-C with CH340 chip
  • SD card slot for local non-volatile storage/logging
          see sparkfun page for enabling auto detect when SD card is inserted
  • Ethernet, high-speed SPI, I2S and I2C
  • JST 2-pin connector for LiPo, with built-in charge controller
          default: RPROG=2k and ICHG=500mA.
          The charge current: is I_chg = 1000/R_prog
  • OS: freeRTOS with LwIP; TLS 1.2
  • see sparkfun link for using MEAS PTH pins to monitor board current consumption
  • standard Reset PB on-board
  • Boot PB onboard puts board into bootloader mode
  • See sparkfun page for using external programmer
  • several on-board LED's ...
    Built-in (blu) - DO-18 (SCK pin)
    TX (grn) - UART indicators
    RX (yel) - UART indicators
    PWR (red) - on if board powered
    CHG (yel) - on if LiPo is attached and charging. (may flicker if no LiPo connected)
    GPIO2 (rgb) - WS2812 LED
  • see sparkfun page for usage of the 14 on-board solder jumpers

• Power the board:
  • USB-C with standard 5v
  • barrel jack with 7 - 15 vdc
  • direct to header pins - do not exceed 3.3v on the 3.3v pin
  • with LiPo battery
          if powering with a LiPo battery,
          closing the "ALERT" jumper enables the Battery Fuel Gauge Alert on GPIO pin 4.
          The I2C address to access the battery fuel gauge is 0x36.

• Programming:
  • Using Arduino IDE:
  • Make sure you have the latest ESP32 board definitions installed in the Arduino IDE Boards Manager:
          ESP 2.0.11 installed 2024-04-03
          Tools --> Boards --> esp32 --> SparkFun ESP32 Iot RedBoard

  • Successful with blink program

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