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ESP32-C3 + WS2812 + battery
finkregh edited this page 2024-11-14 17:58:57 +00:00
The wonderful bleeptrack created https://a-star.bleeptrack.de/, and shows https://vis.social/@bleeptrack/113350197702251142 that you can put some LEDs in them to make them extra fancy.
This is a howto with parts, connections, configuration examples.
Features
- turn LEDs on when booting; slowly, randomly changing colors
- battery is used until it is empty, will be changed when connected via USB
- in this state the usage is not available, an example on how to connect additional parts can be seen on e.g. https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/#battery-usage or https://wiki.seeedstudio.com/check_battery_voltage/
- with another board you can use this configuration: https://esphome.io/components/sensor/adc.html#measuring-battery-voltage-on-the-firebeetle-esp32-e
Parts used
- ESP32-C3 board
- 3.7 V, 400 mAh battery
- USB-C -> USB-A cable
- WS2812B 5050 SMD
ESPHome / Homeassistant integration
All config values can be looked up in the esphome documentation: https://esphome.io/
This configuration will:
- be discoverable in HomeAssistant
- enable the LEDs with slowly randomly changing colors
- enable an wifi access point in case the wifi connection breaks or no credentials have been saved
- log events (visible in e.g. the devices' website)
- enable a webserver, where you can configure the light (access via e.g. http://a-star.local)
---
esp32:
board: seeed_xiao_esp32c3
#variant:
flash_size: 4MB
# not available on esp32c3
# perhaps some help is available here: <https://community.home-assistant.io/t/seeed-studio-xiao-esp32c3-seeed-xiao-esp32c3-enable-touchpad/794810>
#esp32_touch:
# setup_mode: true
#
#binary_sensor:
# - platform: esp32_touch
# name: "ESP32 Touch Pad GPIO20"
# pin: GPIO20
# threshold: 1000
# - platform: esp32_touch
# name: "ESP32 Touch Pad GPIO21"
# pin: GPIO21
# threshold: 1000
light:
- platform: neopixelbus
type: GRB
variant: WS2812
pin: GPIO3
num_leds: 2
name: "NeoPixel Light"
id: star_leds
restore_mode: ALWAYS_ON
on_turn_on:
- light.turn_on:
id: star_leds
effect: "My Slow Random Effect"
effects:
- random:
- random:
name: "My Slow Random Effect"
transition_length: 30s
update_interval: 30s
- random:
name: "My Fast Random Effect"
transition_length: 4s
update_interval: 5s
- pulse:
- pulse:
name: "Fast Pulse"
transition_length: 0.5s
update_interval: 0.5s
min_brightness: 0%
max_brightness: 100%
- pulse:
name: "Slow Pulse"
# transition_length: 1s # defaults to 1s
update_interval: 2s
- pulse:
name: "Asymmetrical Pulse"
transition_length:
on_length: 1s
off_length: 500ms
update_interval: 1.5s
- addressable_twinkle:
- addressable_twinkle:
name: Twinkle Effect With Custom Values
twinkle_probability: 5%
progress_interval: 4ms
esphome:
name: "a-star"
# Enable Home Assistant API
api:
encryption:
key: "" # get a random string from <https://esphome.io/components/api.html>
ota:
platform: esphome
password: "" # just use a random string
wifi:
#ssid: ""
#password: ""
# Enable fallback hotspot (captive portal) in case wifi connection fails or no credentials have been saved (see above)
# you will need to wait 1 minute for this to come up if credentials have been entered and the device is searching for wifi
ap:
ssid: "A-Star Fallback Hotspot"
password: "esphome1234"
captive_portal:
# Enable logging
logger:
# internal webserver
web_server:
port: 80
# all content served from flash, inline
local: true
Simple variant for standalone operation
---
esp32:
board: seeed_xiao_esp32c3
#variant:
flash_size: 4MB
# not available on esp32c3
# perhaps some help is available here: <https://community.home-assistant.io/t/seeed-studio-xiao-esp32c3-seeed-xiao-esp32c3-enable-touchpad/794810>
#esp32_touch:
# setup_mode: true
#
#binary_sensor:
# - platform: esp32_touch
# name: "ESP32 Touch Pad GPIO20"
# pin: GPIO20
# threshold: 1000
# - platform: esp32_touch
# name: "ESP32 Touch Pad GPIO21"
# pin: GPIO21
# threshold: 1000
light:
- platform: neopixelbus
type: GRB
variant: WS2812
pin: GPIO3
num_leds: 2
name: "NeoPixel Light"
id: star_leds
restore_mode: ALWAYS_ON
on_turn_on:
- light.turn_on:
id: star_leds
effect: "My Slow Random Effect"
effects:
- random:
- random:
name: "My Slow Random Effect"
transition_length: 30s
update_interval: 30s
- random:
name: "My Fast Random Effect"
transition_length: 4s
update_interval: 5s
- pulse:
- pulse:
name: "Fast Pulse"
transition_length: 0.5s
update_interval: 0.5s
min_brightness: 0%
max_brightness: 100%
- pulse:
name: "Slow Pulse"
# transition_length: 1s # defaults to 1s
update_interval: 2s
- pulse:
name: "Asymmetrical Pulse"
transition_length:
on_length: 1s
off_length: 500ms
update_interval: 1.5s
- addressable_twinkle:
- addressable_twinkle:
name: Twinkle Effect With Custom Values
twinkle_probability: 5%
progress_interval: 4ms
esphome:
name: "stern-test"
ota:
platform: esphome
password: "" # a random string
wifi:
ssid: ""
password: ""
# Enable fallback hotspot (captive portal) in case wifi connection fails or no credentials have been saved (see above)
# you will need to wait 1 minute for this to come up if credentials have been entered and the device is searching for wifi
ap:
ssid: "a-star Fallback Hotspot"
password: "esphome1234"
captive_portal:
# Enable logging
#logger:
# internal webserver
web_server:
port: 80
# all content served from flash, inline
local: true
Firmware installation
If you connect the board via USB to a computer and follow https://esphome.io/guides/getting_started_command_line#first-uploading you should be able to flash it.
Physical connections / cables
Battery
On the backside of the board you can see BAT with two copper pads above and + / -. Connect the red cable from the battery to + and the black one to -.
WS2812B LEDs
The LEDs can be connected one after another in serial, see Din/Dout on the backside to get an orientation on where stuff goes in and out.
For this project I connected the ESP32 board to LED1 via Din and its Dout to Din of LED2.
-
ESP32 GND -> GND[Din side] on LED1
-
ESP32 3V -> 5V[Din side] on LED1
-
ESP32 GPIO 3 -> Din on LED1
-
LED1 all from Dout side to LED2 on Din side