MCP23017 GPIO Expansion for Home Capability

S.C.O.R.E. → Convenience → Device Control

Overview

The MCP23017 is a GPIO expander that allows homeowners to control multiple devices and sensors from a single I2C interface, enhancing their home capability capabilities. This integration simplifies the connection of additional devices, making it easier to manage and automate various tasks around the home.

Benefits

• Increased control over multiple devices using fewer GPIO pins.
• Seamless integration with existing Home Assistant setups for enhanced capability.
• Ability to expand home capability projects without the need for additional microcontrollers.

Intent

This capability enables users to expand their home capability system by adding more input and output options through the MCP23017 GPIO expander. It achieves a more versatile and efficient home control environment.

Preconditions

• Home Assistant installed and configured.
• MCP23017 connected to a compatible microcontroller or Raspberry Pi.
• Integration available and authenticated: Zigbee2MQTT.
• Device installed and reachable: Network Video Recorder (NVR) and Cameras.

Actors

• Homeowner
• Family member
• Guest

Trigger

The capability is triggered by a specific input from the MCP23017, such as a button press or sensor activation.

Workflow Diagram

flowchart TD
    A[Input from MCP23017] -->|check| B{{Is Input Active?}}
    B -->|Yes| C[Execute Capability Action]
    C --> D[Update Device Status]
    B -->|No| E[Wait for Next Input]

Workflow Description

1. Connect MCP23017

Physically connect the MCP23017 to the Raspberry Pi or microcontroller using the I2C interface.

2. Configure Home Assistant

Add the MCP23017 integration in Home Assistant to recognize the GPIO pins and map them to desired functions.

3. Define Capability Triggers

Set up capabilities that respond to inputs from the MCP23017, such as turning on lights or sending notifications.

4. Test the Setup

Activate each input to ensure the corresponding output actions are executed correctly.

5. Monitor and Adjust

Observe the performance and make any necessary adjustments to the configuration or capability settings.

Postconditions

After the capability is utilized, the home capability system can respond dynamically to multiple inputs from the MCP23017, providing enhanced control and convenience.

Optional Enhancements

• Add a web interface for easier management of GPIO configurations.
• Integrate with voice assistants for voice control of GPIO outputs.
• Implement logging for monitoring GPIO activity over time.

Recommended Components

Source Examples

• 2026.1: Home is where the dashboard is ?? – Home Assistant (homeassistant)