UnitController - Web-Based Control for Pressure Washing Valves Overview UnitController is a Flask-based web server designed to control pressure washing valves via Digital-to-Analog Converters (DACs) on a Raspberry Pi. The system enables remote control of valves and relays through a web-based interface, making use of I2C communication and relay modules. Features Web-Based Control: Provides a web interface to manage valves and relays. DAC Voltage Control: Adjusts valve states by setting DAC output voltages. Engine Starter Control: Controls relays to start or stop the engine. Preset Management: Allows users to save and apply voltage configurations. I2C Device Detection: Automatically detects connected DACs on the I2C bus. Hardware Setup Power Distribution 12V Power Source: Feeds an amped distributor. 12V Valves: Directly powered from the distributor. 5V Step-Down Regulator: Powers DACs, relays, and the Raspberry Pi. I2C Rail: Handles communication between the Raspberry Pi and DACs. Software Setup Prerequisites Raspberry Pi Setup Install Raspberry Pi OS (preferably Lite for headless operation). Ensure Python 3 and Flask are installed. Network Configuration The Raspberry Pi must run an Access Point (AP) on boot to enable local network access. I2C Configuration Enable I2C on the Raspberry Pi using raspi-config. Install required libraries for I2C communication. Installation Steps Clone the Repository git clone https://github.com/Jtanner5674/unitcontroller.git cd unitcontroller Install Dependencies pip install flask flask-cors busio board Enable AP Mod Follow Raspberry Pi AP setup guides. Run UnitController on Boot Add unit.py to system startup by modifying rc.local or creating a systemd service. sudo nano /etc/rc.local Add before exit 0: python3 /path/to/unit.py & Running the Application Manually python3 unit.py API Endpoints Web Pages / - Main control interface /settings - Configuration page API Functions Voltage Control POST /set_voltage - Sets DAC voltage POST /close1 - Closes valve (0V) POST /open1 - Opens valve (100% voltage) GET /get_current_voltage/string:dac_id - Retrieves current DAC voltage Engine Control POST /start-engine - Starts or stops the engine Preset Management GET /get_presets - Retrieves stored presets POST /save_preset - Saves a new preset POST /apply_preset - Applies a stored preset POST /delete_preset/<preset_name> - Deletes a preset Troubleshooting I2C Devices Not Detected: Ensure correct wiring and I2C is enabled in raspi-config. DAC Output Incorrect: Check power supply and DAC address configuration.