Blinky with ESPHome ESP32-C3

Updated on 13 November 2023

dev board ESP32-C3-DevKitM-1

chip ESP32-C3-MINI-1-N4

features esphome esp32c3 blinky

Before starting

Dependancies

Ensure the following dependancies are downloaded and available:

ESPHome

Buy the components

ESP32-C3-DevKitM-1

Code

Download config blinky-esphome-esp32c3.yaml

esphome:
  name: blinky
  platformio_options:
    board_build.flash_mode: dio

esp32:
  board: esp32-c3-devkitm-1
  variant: ESP32C3
  framework:
    type: esp-idf

logger:
  level: VERBOSE
  baud_rate: 115200
  deassert_rts_dtr: true

switch:
  - platform: gpio
    pin:
      number: 3 # on-board LED GPIO8 does not work, so GPIO3 is used
      mode: output
    id: led

interval:
  - interval: 2s
    then:
      - switch.toggle: led
      - logger.log: "LED toggling"

Makefile

YAML_FILE=blinky-esphome-esp32c3.yaml
PORT?=/dev/cu.usbserial-*

.PHONY: default compile upload log clean

default: clean compile upload log

help: ## Show help message
	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[$$()% 0-9a-zA-Z_-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)

compile: ## Compile esphome
	esphome compile $(YAML_FILE)

upload: ## Upload the firmware to the board
	esphome upload --device $(PORT) $(YAML_FILE)

log: ## Start the logs
	esphome logs --device $(PORT) $(YAML_FILE)

clean: ## Remove all build files
	rm -rf .esphome

Prototype

A photo of the actual setup.

Schematic

Wire up the hardware accordingly

Serial console

Serial output from the firmware.

Description

LED

The default RGB LED on-board which is GPIO8 does on work. So, wire up a simple LED to GPIO3 with a 1k resistor to the ground.

Compile and upload

Compile firmware for this board

 esphome compile blinky-esphome-esp32c3.yaml

Plug into the USB port of the board and check the port address

 $ ls /dev/cu.*
 /dev/cu.Bluetooth-Incoming-Port  /dev/cu.SLAB_USBtoUART  /dev/cu.usbserial-1410

Upload the firmware

 esphome upload --device /dev/cu.SLAB_USBtoUART blinky-esphome-esp32c3.yaml

Access logs

Plug into the USB port of the board

Check the new port address

 $ ls /dev/cu.*
 /dev/cu.Bluetooth-Incoming-Port  /dev/cu.SLAB_USBtoUART  /dev/cu.usbserial-1410

Access the logs

 esphome logs --device /dev/cu.SLAB_USBtoUART blinky-esphome-esp32c3.yaml