Wemos D1 R32 (ESPDuino-32)

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Support for the Wemos D1 R32 (ESPDuino-32) board

Tip

When using this board with RIOT, set the BOARD variable to esp32-wemos-d1-r32 in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

./Makefile

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= esp32-wemos-d1-r32

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Support for the Wemos D1 R32 (ESPDuino-32) board @author Gunar Schorcht gunar@schorcht.net

\section esp32_wemos_d1_r32 Wemos D1 R32 board (ESPDuino-32)

Overview

The Wemos D1 R32 board is an ESP32 board in the Arduino Uno format that uses the ESP32-WROOM-32 module. It is exactly the same board that is also known as ESPDuino-32 on the market. The board is pin compatible with the Arduino Uno board. The peripheral configuration corresponds to the Arduino Uno pinout and guaranties the compatibility with Arduino Uno Shields.

Hardware

MCU

Most features of the board are provided by the ESP32 SoC. For detailed information about the ESP32, see section esp32_mcu_esp32 “MCU ESP32”.

Board Configuration

The board configuration guarantees that the board is compatible with Arduino Uno Shield. The board configuration provides:

• 6 x ADC channels
• 2 x DAC channels
• 2 x PWM devices with a total of 7 channels
• 1 x SPI device
• 1 x I2C device
• 2 x UART devices

The following table shows the default board configuration, which is sorted according to the defined functionality of GPIOs.

Function | GPIOs | Arduino Pin |Configuration :---------------|:-------|:------------|:---------------------------------- ADC_LINE(0) | GPIO2 | A0 | esp32_adc_channels "ADC Channels" ADC_LINE(1) | GPIO4 | A1 | esp32_adc_channels "ADC Channels" ADC_LINE(2) | GPIO35 | A2 | esp32_adc_channels "ADC Channels" ADC_LINE(3) | GPIO34 | A3 | esp32_adc_channels "ADC Channels" ADC_LINE(4) | GPIO36 | A4 | esp32_adc_channels "ADC Channels" ADC_LINE(5) | GPIO39 | A5 | esp32_adc_channels "ADC Channels" DAC_LINE(0) | GPIO25 | D3 | esp32_pwm_channels "DAC Channels" DAC_LINE(1) | GPIO26 | D2 | esp32_pwm_channels "DAC Channels" I2C_DEV(0):SDA | GPIO21 | SDA | esp32_i2c_interfaces "I2C Interfaces" I2C_DEV(0):SCL | GPIO22 | SCL | esp32_i2c_interfaces "I2C Interfaces" LED | GPIO2 | A0 | - PWM_DEV(0):0 | GPIO25 | D3 | esp32_pwm_channels "PWM Channels" PWM_DEV(0):1 | GPIO16 | D5 | esp32_pwm_channels "PWM Channels" PWM_DEV(0):2 | GPIO27 | D6 | esp32_pwm_channels "PWM Channels" PWM_DEV(0):3 | GPIO13 | D9 | esp32_pwm_channels "PWM Channels" PWM_DEV(0):4 | GPIO2 | A0 | esp32_pwm_channels "PWM Channels" PWM_DEV(1):0 | GPIO5 | D10 | esp32_pwm_channels "PWM Channels" PWM_DEV(1):1 | GPIO23 | D11 | esp32_pwm_channels "PWM Channels" SPI_DEV(0):CLK | GPIO18 | D13 | esp32_spi_interfaces "SPI Interfaces" SPI_DEV(0):MISO | GPIO19 | D12 | esp32_spi_interfaces "SPI Interfaces" SPI_DEV(0):MOSI | GPIO23 | D11 | esp32_spi_interfaces "SPI Interfaces" SPI_DEV(0):CS0 | GPIO5 | D10 | esp32_spi_interfaces "SPI Interfaces" UART_DEV(0):TxD | GPIO1 | D1 | esp32_uart_interfaces "UART interfaces" UART_DEV(0):RxD | GPIO3 | D0 | esp32_uart_interfaces "UART interfaces" UART_DEV(1):TxD | GPIO10 | D4 | esp32_uart_interfaces "UART interfaces" UART_DEV(1):RxD | GPIO9 | D5 | esp32_uart_interfaces "UART interfaces"

For detailed information about the configuration of ESP32 boards, see section esp32_peripherals “Common Peripherals”.

Board Pinout

The following figure shows the pinout of the Wemos D1 R32 board. It is exactly the same as for the ESPDuino-32 board. The corresponding board schematics can be found here.

Warning: The pinout contains the following errors. Analog Arduino pin A2 with white label IO36 is actually ADC1 Channel7 that is connected to GPIO35 and analog Arduino pin A4 with white label IO38 is actually ADC1 Channel0 that is connected to GPIO36. That is the colored labels are correct in the pinout.

Flashing the Device

Flashing RIOT is quite easy. The board has a Micro-USB connector with reset/boot/flash logic. Just connect the board to your host computer and type using the programming port:

BOARD=esp32-wemos-d1-r32 make flash ...

For detailed information about ESP32 as well as configuring and compiling RIOT for ESP32 boards, see esp32_riot.