Multichannel Professional Data Logger on Raspberry Pi – Part 1


See the Part 2 for the hardware and Part 3 for the software implementation.

In this series of articles I’ll explain how to build a multichannel Data Logger, capable of collecting voltage, current and temperature measurements over the specified intervals of time.

Our alternate goal is to proof that Raspberry Pi is not just a nice tool to promote teaching of basic computer skills in school, but a serious instrument capable of handling professional tasks.
Multichannel Professional Data Logger on Raspberry Pi - Part 1 SchematicA “data logger” definition from Wikipedia: “A data logger is an electronic device that records data over time, or in relation to location either with a built in instrument or sensor or via external instruments and sensors”.

Requirements

Let’s first clarify our requirements. As a field / service engineer, I want to have:

  • 8 input ports which can measure temperature in ranges between 0 and 260 C (about 32…500 F);
  • 8 input ports to measure either voltage (30mV … 30V, +/- 2mV) or current (10mA … 500A);
  • time measurement interval (1 … 60 sec);
  • a simple way to configure data logger and store configuration parameters between restarts;
  • an intuitive way to retrieve collected data or represent it in graph format;

Multichannel Professional Data Logger on Raspberry Pi - Part 1 SchematicNice-to-haves:

  • lightweight and portable solution: logger should run on batteries;
  • easy to handle and operate in both field or in lab conditions;
  • Desktop or laptop computer is not needed to operate and collect data;

The requirements above would let you have a tool to test or tune your Segway, car or boat electric circuits, chicken incubator, solar battery or greenhouse.

 

For more detail: Multichannel Professional Data Logger on Raspberry Pi – Part 1


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