RPIWA - Waveform Access & Continuous Monitoring

This product is under development. For stable products please refer to our RPICT range instead

RPIWA range aims to provide the same functionalities as RPICT range which is to compute RMS values and power related values at regular intervals. The bonus with RPIWA is the possibility to directly access the raw data. A developer can now perform his own RMS / power computations if desired. Or maybe plot the fft in real time. Or anything else you invented. A great benefit is the ability to perform continuous monitoring as the waveform sampling is now uninterrupted.

Let's compare RPICT and RPIWA in the current state.

RPIWA

• RMS and power related computations.
• Continuous monitoring.
• Limited Product (only RPIWA_CT7V1 for now).
• Not stackable.
• Not stable (we are still working on the software).

RPICT

• RMS and power related computations.
• No continuous monitoring.
• Stable and well established.
• Large range of product.
• Stackable.

If you are acquiring our product for the first time we recommend starting with RPICT units instead here.

Software installation

Get the package and install it

wget http://lechacal.com/RPIWA/rpiwa-realtime-v1.0.0_armhf.deb
sudo dpkg -i  rpiwa-realtime-v1.0.0_armhf.deb

Reading the data

Data are made available from a fifo located in /tmp/RPIWA.fifo. You can access the data with a simple cat command.

cat /tmp/RPIWA.fifo

An example of the output is shown below.

479169 -191.791 -0.009 -0.010 -0.009 -0.010 -0.017 -0.011 -0.025
479170 -223.441 -0.009 0.064 0.065 -0.010 -0.017 -0.011 -0.025
479171 -253.859 -0.009 -0.010 -0.009 -0.010 -0.017 -0.011 -0.025
479172 -277.439 -0.009 -0.010 -0.009 -0.010 -0.017 0.063 0.049
479173 -297.191 -0.009 -0.010 -0.009 -0.010 -0.017 -0.011 -0.025
479174 -312.319 0.065 -0.010 -0.009 -0.010 -0.017 0.063 0.049

The format normally depends on what is configured. In this instance the first field is the sample number followed by the instant value in Volts or Ampere for each channels.