This is a small PCB Christmas tree project. The design consists of circular circuit boards that are connected by stackable connectors. Each PCB contains mini versions of the WS2812 (size 2020). ESP32-C3 is used for control. Connected sensors measure ambient light, temperature and humidity. The program can be controlled using two buttons and a small OLED display.
Manual is only for Slovak guys. 😃
- Strom schematic
- datasheet to ESP32-C3 SuperMini
Mainboard - Top-side photo
| Pin | Connection |
|---|---|
| 0 | Analog input, ambient light from photo-resistor |
| 1 | Neopixel Output, 37 x WS2812 |
| 2 | GPIO2, free pad |
| 3 | GPIO3, free pad |
| 4 | PWM output, buzzer |
| 5 | Input, button SW2 |
| 6 | SDA, I2C data |
| 7 | SCL, I2C clock |
| 8 | PWM output, blue LED |
| 9 | NC, Boot button |
| 10 | Output, +5V enable, supply for WS2812 |
| 20 | Input, Alert from INA226 and TPS25200 |
| 21 | Input, button SW1 |
Devices at I2C bus:
| Device | Addr8 | Addr7 | Driver |
|---|---|---|---|
| GME12864 | 0x78 | 0x3C | ssd1306 |
| VEML7700 | 0x20 | 0x10 | veml7700 |
| HDC1080 | 0x80 | 0x40 | hdc1080 |
| INA226 | 0x8A | 0x45 | ina226 |
- software is written in micropython
- ESP32-C3 is flashed with variant LOLIN_C3_MINI