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  • ESP32 breakout board
    • Requires specific version of ESP32 board (marked ESP32 DEVKITV1 on bottom)
  • GVS (Ground, Voltage, Signal) for all ESP32 module pins
  • 4-channel I2C Hub
    • TCA9544 - 4-Channel I2C and SMBus Multiplexer With Interrupt Logic
    • Isolated I2C channels
    • Interrupt for each I2C channel
    • I2C Channels can be independently powered with 3.3V or 5V
    • Jumper selectable I2C base address
  • GVS (Ground, Voltage, Signal) for all ESP32 pins
  • FTDI header
  • SPI bus header
  • 5V power source selection/distribution
    • 5V sources - USB, 5mm terminal block, DC jack
  • On-board 3.3V power regulator (doesn't stress the ESP32 regulator)
  • 95x95mm ODAS form factor
  • 6-32 mounting holes

ESP32-WROOM-32 Module[edit]

ESP32 MODULE-720PX.jpg



Module Features[edit]

  • Architecture: Xtensa Dual-Core 32-bit LX6
  • CPU frequency: up to 240MHz
  • Total RAM available: 528KB (part of it reserved for system)
  • BootROM: 448KB
  • Internal FlashROM: none
  • External FlashROM: code and data, via SPI Flash; usual size 4MB
  • GPIO: 34 (GPIOs are multiplexed with other functions, including external FlashROM, UART, etc.)
  • UART: 3 RX/TX UART (no hardware handshaking), one TX-only UART
  • SPI: 4 SPI interfaces (one used for FlashROM)
  • I2C: 2 I2C (bitbang implementation available on any pins)
  • I2S: 2
  • ADC: 12-bit SAR ADC up to 18 channels
  • DAC: 2 8-bit DACs
  • RMT: 8 channels allowing accurate pulse transmit/receive
  • Programming: using BootROM bootloader from UART - due to external FlashROM and always-available BootROM bootloader, the ESP32 is not brickable


Rev 3 CAD 2 1.PNG

H1 - 3.3V from on-board regulator Header[edit]

  • Install jumper

H1 PWR 3v3.png

  • Alternate for 3.3V power is to install S to V jumper at 3.3V header position (bottom right)
    • H1 should not be installed for that case

PWR 3v3 2.png

H2 - 5V SRC Header[edit]

  • 2x3 header
  • Care must be taken to install the correct jumpers
  • USB jumper sends out 5V when a USB cable is connected to the ESP32 module
  • USB jumper sends 5V into the ESP32 module when there is no USB cable connected to the ESP32 module

Power from USB on ESP32 module[edit]

H2 USB.png

  • Do not install FTDI jumper
  • Do not install DCJ jumper
  • Install USB jumper

Power from 5V jack[edit]

H2 DCJ.png

  • Do not install FTDI jumper
  • Install DCJ jumper
  • Install USB jumper

Power from FTDI[edit]

H2 FTDI.png

  • Unstall FTDI jumper
  • Do not install DCJ jumper
  • Install USB jumper

J2 - FTDI[edit]

  • Rx0/Tx0 connect to the USB-Serial interface on the ESP32 module


FTDI rot.jpg

J3 - I2C Mux Base Address Select Jumpers[edit]

  • A0-A2
    • Install for 0
    • Remove for 1

J3 A0-2.png

J7 - I2C Interface[edit]

  • Also goes to the I2C Hub chip
  1. INT* (GPIO5)
  2. SCL (GPIO22)
  3. SDA (GPIO11)
  4. VCC
  5. GND

J4, J5, J6, J8 - I2C Power Select (Ports #0-#3)[edit]

  • Selects 3.3V or 5V on I2C
  • 1-2 = 3.3V
  • 2-3 = 5V

J9, J10, J11, J12 - I2C interfaces #0-#3[edit]

  1. GND
  2. VCC
  3. SDA
  4. SCL
  5. INT*

P1 - 5V Power[edit]

  • 2x8 pin header

P1 5V Power.png

P8 - SPIbus connector[edit]

  1. MISO
  2. 3.3V
  3. SCK
  4. MOSI
  5. n/c
  6. GND


Left GVS connector[edit]

  1. EN (Pull low to shut off 3.3V reg)
  2. VP/GPI36 (Input only)
  3. VN/GPI39 (Input only)
  4. GPI34 (Input only)
  5. GPI35/A7 (Input only)
  6. P32/A4
  7. P33/A5
  8. P25/A8
  9. P26/A9
  10. P27/SCL
  11. P14/SD_CLK
  12. P12/SD_D2
  13. P13/SD_D3
  14. VUSB

Right GVS connector[edit]

  1. P23/MOSI
  2. SCL/RTS1
  3. P1/TX
  4. I3/RX
  5. P21/SDA
  6. P19/CTS0
  7. P18/SCK
  8. P5
  9. P17/TX2
  10. P16/RX2
  11. P4/SD_D1
  12. P2/SD_D0
  13. P15/SD_CMD
  14. 3.3V

Software Support[edit]


MicroPython SD Card Support[edit]

sdcard support is included which uses esp-idf sdmmc driver and 
can work in SD mode (1-bit and 4-bit)  or in SPI mode (sd card can 
be connected to any pins).
  • GPIO14 = SD_Card CLK = SCK
  • GPIO15 = SD_Card CMD/DI = MOSI
  • GPIO2 = SD_Card DATA0/DO = MISO
  • GPIO13 = SD_Card DAT3 = CS

Arduino Programming[edit]

  • Board : "DOIT ESP32 DEVKIT V1"

Ardino ESP32.png


Assembly Sheet[edit]