The Automation pHAT is a compact home monitoring and automation controller for Raspberry Pi in the smaller pHAT form factor. With a relay, three analogue channels, buffered inputs, and sinking outputs — all 24V tolerant — it packs serious control capability into a minimal footprint.

Uses the same Python library as the full-size Automation HAT, with automatic board detection. The library includes examples for reading analogue and digital inputs, switching outputs, and controlling the relay. Female header and broken-out pins require soldering.

Key Features

• 1× 24V @ 2A Relay – NC and NO terminals for high-side load switching
• 3× 12-bit ADC (0–24V) – ADS1015 with ±2% accuracy
• 3× Buffered Inputs – 24V tolerant digital inputs
• 3× Sinking Outputs – 24V tolerant, up to 500 mA total across all three
• 3.5 mm Screw Terminals – Secure, tool-friendly connections
• SPI Pins Broken Out – For additional peripheral connectivity
• pHAT Form Factor – Compact size ideal for Pi Zero builds

Compatibility

• Raspberry Pi 3B+, 3, 2, B+, A+, Zero, and Zero W

Important Notes

• Buffered outputs switch on the ground side: 12/24V (supply) → load → output terminal → ground (supply)
• Relay should be switched on the high side (up to 2A)
• Sinking outputs share a 500 mA total budget — a single channel can use the full 500 mA
• Software does not support Raspbian Wheezy

Ideal For

• Compact smart home automation
• Greenhouse and garden monitoring
• Pi Zero-based sensor and relay control
• Industrial monitoring prototypes

Resources

• Python Library (GitHub)
• Automation pHAT Pinout