lutzbellmann/esp32_aht20_bmp280

# esp32_aht20_bmp280 ESP-IDF component for reading temperature, humidity, and pressure from an **AHT20** + **BMP280** sensor pair over I2C, using the ESP-IDF I2C *master* driver (`driver/i2c_master.h`). Requires **ESP-IDF >= 5.2**. ## Installation ```bash idf.py add-dependency "lbellmann/esp32_aht20_bmp280^0.1.0" ``` Or add it manually to your `main/idf_component.yml`: ```yaml dependencies: lutzbellmann/esp32_aht20_bmp280: "^0.1.0" ``` ## Usage ```c #include "env_sensor.h" i2c_master_bus_handle_t bus; ESP_ERROR_CHECK(env_sensor_create_bus(GPIO_NUM_21, GPIO_NUM_22, 0, &bus)); env_sensor_t sensor; ESP_ERROR_CHECK(env_sensor_init(bus, ENV_SENSOR_BMP280_ADDR_LOW, &sensor)); env_sensor_reading_t reading; ESP_ERROR_CHECK(env_sensor_read(&sensor, &reading)); printf("%.2f°C %.2f%%RH %.2fhPa\n", reading.temperature, reading.humidity, reading.pressure); ``` See [`examples/basic`](examples/basic) for a complete, runnable project. ## Wiring | Signal | Notes | |--------|-------| | AHT20 address | fixed at `0x38` | | BMP280 address | `0x76` (SDO → GND) or `0x77` (SDO → VCC) — pass via `ENV_SENSOR_BMP280_ADDR_LOW`/`_HIGH` | | SDA / SCL | any free GPIOs, internal pull-ups are enabled by `env_sensor_create_bus` | | HINT: for the popular I2C sensor modules available on marketplaces choose `ENV_SENSOR_BMP280_ADDR_HIGH` | ## API | Function | Description | |----------|--------------| | `env_sensor_create_bus()` | Create an I2C master bus on the given pins (skip if a bus already exists) | | `env_sensor_init()` | Probe and initialize AHT20 + BMP280 on an existing bus | | `env_sensor_read()` | Trigger a measurement and return temperature, humidity, and pressure | ## License Apache-2.0, see [LICENSE](LICENSE).

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