SensorBroadcast (ESP32 + SCD41)

ESP-IDF application that connects an ESP32 to Wi-Fi, polls a Sensirion SCD41 CO₂/temperature/humidity sensor over I²C, reads a local ADC channel, and broadcasts measurements via UDP.

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Features

• Our device streams telemetry packets over UDP to configurable IP/port(s). Currently, at the very minimum the following hardware schematic can be followed:

Software Architecture

flowchart TD
    A[app_main] --> B[Init ADC/I2C + NVS]
    B --> C[Configure & Start Wi-Fi STA]
    C --> D[Create UDP Task]
    D --> E[Loop: Check SCD41 Data Ready]
    E -->|If ready| F[Read CO₂, Temp, Humidity]
    F --> G[Update globals + flag new data]
    G --> H[UDP Task formats + sends packet]
    E -->|Else| I[Increment fail counter / reset bus]

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Edit these macros hello_world_main.c.

#define EXAMPLE_ESP_WIFI_SSID  "YourSSID"
#define EXAMPLE_ESP_WIFI_PASS  "YourPassword"

#define I2C_SDA_GPIO   21
#define I2C_SCL_GPIO   22
#define TEST_INPUT_ADC_PIN GPIO_NUM_34

// Destination UDP IP/Port
const char *dst_ip   = "192.168.1.100";
uint16_t dst_port    = 12345;

To run use the ESP idf to build in the classical manner. The main file is named hello_world_main.c, the other 2 are availiable for individual feature testing.:

idf.py set-target esp32
idf.py menuconfig   # (optional) adjust configs
idf.py build
idf.py -p /dev/ttyUSB0 flash monitor