Thermostat Controller Application

Overview

This embedded C application implements a closed-loop thermostat system using a BME680 temperature sensor and a pump controlled through GPIO. The system automatically turns the pump ON or OFF based on ambient temperature thresholds.

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Author

Bibin Alias

• APP_Thermostat.c Created on: 22-Apr-2025
• Dev_TempSensor.c Created on: 18-Apr-2025

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Hardware Requirements

Component	Description
ZG28 Explorer Board	Silicon Labs ZG28-based development board
BME680 Sensor Module	Bosch BME680 sensor (I2C interface)
Pump Control Circuit	Connected to a GPIO for ON/OFF switching
I2C Wiring	SDA/SCL lines connected from ZG28 to BME680

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Features

• Sensor initialization, configuration, and self-test
• Temperature-based pump control
• I2C-based sensor interface
• Retrying mechanism for sensor and pump failures
• Real-time temperature display with trend symbols
• Graceful shutdown with deinitialization

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Application Architecture

Files:

File	Description
APP_Thermostat.c	Main control loop and logic
Dev_TempSensor.c	BME680 sensor driver interface
Dev_Pump.c/h	Hardware abstraction for pump control
I2C_Wrapper.c/h	Platform-specific I2C interface
bme68x_defs.h/.c	Bosch sensor definitions
bme68x.c/.h	Bosch BME68x sensor driver

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Functional Flow

graph TD
    A[Start App_vThermostat()] --> B[Pump Initialization]
    B --> C[Pump Off]
    C --> D[Sensor Self-Test]
    D --> E[Sensor Initialization]
    E --> F[Enter Main Loop]
    F --> G[Get Temperature]
    G --> H{Temperature < Low Threshold?}
    H -- Yes --> I[Pump On]
    H -- No --> J{Temperature > High Threshold?}
    J -- Yes --> K[Pump Off]
    J -- No --> L[Do Nothing]
    I --> M[Print Temp + Delay]
    K --> M
    L --> M
    M --> F

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