🌡️ ESP32-C3 IR Blaster (Samsung AC + Sensors)
This project is an ESPHome-based smart IR blaster built on an ESP32-C3, designed to control a Samsung air conditioner and monitor room conditions using sensors.
It includes:
- 📡 IR transmitter (Samsung AC control via heatpumpir)
- 📥 IR receiver (signal learning / debugging)
- 🌡️ AHT20 temperature + humidity sensor
- 🌬️ BMP280 pressure sensor
- 📶 WiFi + Home Assistant integration
🧰 Hardware
Controller
- ESP32-C3 DevKitM-1
Sensors
- AHT20 (temperature + humidity)
- BMP280 (pressure)
IR system
- IR LED (transmitter)
- NPN transistor (2N2222A)
- IR receiver (VS1838B)
🔌 Wiring
ESP32-C3 GPIO map
| Component | Pin |
|---|---|
| AHT20 / BMP280 (I2C SDA) | GPIO4 |
| AHT20 / BMP280 (I2C SCL) | GPIO5 |
| IR Transmitter (signal) | GPIO7 |
| IR Receiver (OUT) | GPIO6 |
| GND | GND |
| VCC (sensors) | 3.3V |
📡 IR Transmitter wiring
- ESP32 GPIO7 → 1KΩ resistor → base (2N2222A)
- Emitter → GND
- Collector → IR LED cathode (-)
- IR LED anode (+) → 5V with resistor ~100Ω
📥 IR Receiver (VS1838B)
| Pin | Connection |
|---|---|
| OUT | GPIO6 |
| VCC | 3.3V |
| GND | GND |
👉 If pins are not labeled:
- Longer leg = VCC
- Middle = OUT
- Short leg = GND
🧠 Firmware
Built using ESPHome (ESP-IDF framework).
Features
🌡️ Sensors
- AHT20 temperature + humidity
- BMP280 pressure sensor
- Software calibration offsets (via Home Assistant)
📡 IR Control
- Samsung AC control via:
heatpumpir
- Protocol tested:
samsung_aqv
📥 IR Learning
- Remote receiver enabled
- Logs raw IR signals in Pronto format
❄️ Climate Control
Samsung AC integration:
climate:
- platform: heatpumpir
name: "Samsung AC"
transmitter_id: ir_tx
protocol: samsung_aqv
sensor: room_temperature
min_temperature: 16
max_temperature: 30
vertical_default: middle
horizontal_default: middle