The WIN-PIHAT-8DO(MOSFET) by Augmatic Technologies is an 8-channel industrial expansion board for Raspberry Pi 4 and CM4. It utilizes High-Side P-Channel MOSFETs to provide reliable solid-state switching for industrial loads, offering superior speed and durability compared to traditional mechanical relays.
Solid-State Switching: Features 8 independent P-MOSFET channels for virtually unlimited operational life.
High Load Capacity: Supports up to 2A continuous current per channel at 12V–24V DC.
High-Side Output: The output voltage reflects the input supply (e.g., 24V input results in 24V output).
Fast Response: Rapid switching time of < 100 µs, ideal for high-speed automation.
Built-in Protection: Each channel includes an integrated flyback diode to protect against inductive load spikes.
Industrial Design: Operates within 0°C to 60°C and fits the standard 40-pin Raspberry Pi GPIO header.
The board uses a BJT-to-MOSFET driver stage to interface with the Raspberry Pi safely:
GPIO HIGH: The Bipolar Transistor (BJT) pulls the MOSFET gate LOW, turning the channel ON and powering the load.
GPIO LOW: The MOSFET turns OFF, cutting power to the load.
This architecture provides level shifting and buffering, protecting the Raspberry Pi’s GPIO pins from high-voltage industrial loads.
The module connects via the 40-pin header and uses the following GPIO mapping:
| Channel | Pi GPIO | Header Pin | Channel | Pi GPIO | Header Pin |
| DO1 | GPIO 17 | 11 | DO5 | GPIO 25 | 22 |
| DO2 | GPIO 27 | 13 | DO6 | GPIO 05 | 29 |
| DO3 | GPIO 22 | 15 | DO7 | GPIO 06 | 31 |
| DO4 | GPIO 24 | 18 | DO8 |
