The WIN-PIHAT-8AO by Augmatic Technologies is an 8-channel analog output expansion board designed for Raspberry Pi 4 and CM4. It enables precise 0–10V signal generation, allowing users to control industrial actuators like Variable Frequency Drives (VFDs) and proportional valves directly from their Raspberry Pi.
High-Precision Output: Supports selectable 12-bit or 16-bit DAC (Digital-to-Analog Converter) resolution.
8 Channels: Scalable architecture with up to 8 independent single-ended voltage outputs.
Voltage Range: Fixed 0–10V DC, perfect for standard industrial control interfaces.
Load Capacity: Provides ~15 mA continuous current (short-circuit protection up to 35 mA).
Industrial Durability: Operates on 12/24V DC input; temperature rated for 0°C to 60°C.
Safety: Includes short-circuit protection to ground for each channel.
The board translates digital commands from the Raspberry Pi into physical voltages using the SPI communication bus:
Software Command: The user defines a digital value (12-bit or 16-bit).
SPI Transfer: The Raspberry Pi sends this value to the onboard DAC IC (TCP112S8 or TCP116S8).
Analog Drive: The DAC converts the data into a proportional 0–10V signal at the terminal blocks.
The module communicates via the SPI bus on the Raspberry Pi 40-pin header:
| Signal Name | Pi GPIO | Header Pin | Description |
| MOSI | GPIO 10 | 19 | SPI Data Output |
| MISO | GPIO 09 | 21 | SPI Data Input |
| SCLK | GPIO 11 | 23 | SPI Clock |
| CE0 / CE1 | GPIO 08/07 | 24 / 26 | Chip Select lines |
