RPICT8 Version 5

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IMG 0425 small.png

Link to shop

This page is for board specific information. More information can be found on the generic page for RPICT series.

  • 8 AC current sensors.
  • Compute real power.
  • Fit on Raspberrypi 4 holes mounting pattern.
  • AtMega328 Mcu (Arduino UNO)
  • MCP3208 12bit ADC
  • Stackable with RPICT8 Slave


Version Compatible?
Raspberrypi 1 A No
Raspberrypi 1 B+ Yes
Raspberrypi 2 B Yes
Raspberrypi 3 B Yes
Raspberrypi 3 B+ Yes RPICT8 v3.0 (Version RPICT8 v1.3 see this link).
Raspberrypi 4 B Yes

  • Asus Tinkerboard has been reported to work with RPICT units. Note we wont be able to provide support for the Tinkerboard.

Recommended sensors

AC Current sensor

  • SCT-013-000
  • SCT-006
  • SCT-019

Only current output CT are supported.

IMG 1921 small.png

Stacking Configuration

General stacking information is described in the RPICT stacking page.

RPICT_Stacking Version 5

Software Configuration

Using a serial line terminal program one can configure the following:

- Polling interval
- Output format (csv or emoncms)
- Calibration values (Voltage and Current)
- Voltage/current combinations for real power computation.
- Output channels

The documentation for serial configuration can be found on this page.

Over Serial Configuration - Sketch 3.0

Online config 01.png The board can be configured with the online configurator.

Auto Reset

Version 5 units have auto reset support. When using the lcl-rpict-config.py command it is possible to reset the RPICT remotely with the -a option.

lcl-rpict-config.py -a 


lcl-rpict-config.py -a -w myfile.conf


Default Sketch

Default Sketch V3.1.0.
Default Sketch V3.2.0. hex

noOSC Sketch

The Default sketch allows up to 28 computation nodes to be run. If more are needed for higher stacks then we recommend to use the noOSC sketch. This is the same as the default sketch but Over Serial Configuration (OSC) as been removed to allow up to 40 nodes to be computed. Configuration has to be edited in the sketch.

noOSC Sketch v1.0
noOSC Sketch v1.1

Default Data Output

Using the manufacture firmware the data output is:

NodeID P1 P2 P3 P4 P4 P5 P6 P7 P8

P1 being the estimated Power using CT1. `Estimated Power` computes power multiplying Irms by Vest. Where Vest is the estimated Voltage setup in the config. By default Vest=240V we recommend to change this to 220V or 110V if your local voltage supply differ.

Other output type can be streamed out. This should be configured in the unit.

All outputs type available are

  • Estimated Power (W)
  • Irms (A)

If stacked with another unit that include a voltage port the following outputs can also be added:

  • Real Power (W)
  • Apparent Power (W)
  • Power Factor
  • Vrms (V)

Restore Default Config

You should have received a key when acquiring the unit. Use this key to download and restore the default configuration.
If the key was XXXX then execute these commands below. Replace XXXX with your own key.

$ wget lechacal.com/hardware/c/XXXX.conf
$ lcl-rpict-config.py -w XXXX.conf

Emoncms Config (Emonhub)

Make you read this first.

For default configuration.

   nodename = RPICT8
   hardware = RPICT8
       names = Power1, Power2, Power3, Power4, Power5, Power6, Power7, Power8
       datacode = 0
       scales = 1,1,1,1,1,1,1,1
       units = W,W,W,W,W,W,W,W

Python demo script

First of all make sure you have python-serial package installed

$ sudo apt-get install python-serial

Then copy the following into an executable file and run it.

 import serial
 ser = serial.Serial('/dev/ttyAMA0', 38400)
        while 1:
             # Read one line from the serial buffer
             line = ser.readline()
             # Remove the trailing carriage return line feed
             line = line[:-2]
             # Create an array of the data
             Z = line.split(' ')
             # Print it nicely
             print ("----------")
             for i in range(len(Z)):
                 if i==0:
                     print ("NodeID: %s" % Z[0])
                     print ("Power %d: %s W" % (i, Z[i]))
 except KeyboardInterrupt:


Enclosures kit are available as a 3D printed product. Link to the shop.

Both Raspberrypi 3 and 4 format are available.


Related Pages

Howto setup Raspbian for serial read


Update RPICT firmware (CT7V1/CT4V3/CT8)

Use Emonhub with RPICT