The DAQCplate（Data Acquisition and Controller）from Pi-Plates adds a rich set of input/output options to your Raspberry Pi. It includes seven powerful digital outputs for driving external devices such as relays and high-current LEDs, as well as eight analog-to-digital inputs for measuring temperature, voltage, humidity and more. Additionally, there are eight digital inputs, two analog outputs and seven general-purpose indicator LEDs.
Pi-Plates are a family of stackable and interchangeable add-on circuit boards that allow you to interact with the outside world using your Raspberry Pi. Every Pi-Plate is designed to provide a robust set of features at minimal cost while using the fewest pins possible on the RPi header. Pi-Plates are mechanically and electrically compatible with all revisions of the Raspberry Pi with 40 pin headers（including the Pi 3 Model B and Pi Zero）and are designed to satisfy the needs of hobbyists, experimenters and professionals.
Features
Dedicated onboard processor
8 protected digital inputs
8 protected analog inputs
2 protected analog outputs
7 open collector outputs
Provides real-time data collection
Allows for future code updates
Only needs two dedicated RPI pins（GPIO 25 and CE1）
Compatible with all versions of Raspberry Pi
Design allows up to eight DAQCplates to be stacked together for eight times the I/O
Uses less than 20mA of DC current during standby2
Includes programmable bi-color LED
Additional 14-pin header included if B+ signals are required
Capable of reading up to seven HC-SR04 distance sensors
