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Description: 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

Documents:

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Customer Comments

  • What is the ADC sampling frequency? The documentation does not immediately describe this feature in detail.

    • Pi-Plates communicate to the Raspberry Pi via the SPI interface. This limits the effective A/D sampling rate to about 1000 samples per second. The 50Khz bandwidth mentioned in another comment here is the maximum allowed input frequency.

    • User guide says 50KHz limit.

      • The user guide says the bandwidth is 50 kHz.

        Sampling rate is defined as the number of samples acquired in one second. The Nyquist theorem states that a signal must be sampled at least twice as fast as the bandwidth of the signal to accurately reconstruct the waveform.

        Given a max bandwidth of 50kHz, the sampling rate would have to be a minimum of 100 ksps.

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