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Link to the shop

  • 4 AC current sensors.
  • 3 AC Voltage sensors.
  • 1 Temperature port
  • Compute real power.
  • Fit on Raspberrypi 4 holes mounting pattern.
  • AtMega328 Mcu (Arduino UNO)
  • MCP3208 12 bits ADC
  • Stackable with RPICT8_slave and RPI_T8.
  • Onboard voltage transformer

RPICT4W3T1 is the equivalent board to the RPICT4V3 with ZMPT voltage transformer integrated and the addition of a DS18B20 temperature sensor port.

Recommended sensors

  • AC Current sensor:
    • SCT-013-000
    • SCT-019
    • SCT-006
  • AC Voltage sensor:
    • ZMPT101B module is integrated.
  • Temperature:
    • DS18B20

VOLTAGE OUTPUT CT SUCH AS SCT-013-030 and other SCT-013-0XX ARE NOT COMPATIBLE WITH THIS BOARD. Only use the SCT-013-000 which is a current output CT.

Temperature Sensor


The temperature port supports mutiple sensor on the same Onewire line.

The sketch is programmed to search for all connected probe at bootup and output all their values when polled.

Multiple probes should connected as shown below.

Ds18b20 daisychain.png

Software Configuration

The documentation for serial configuration can be found on this page.
Configuration for 3Phase firmware

The online configurator can be used with the RPICT4W3T1. Use a single board of RPICT4V3 when editing the configuration.

Online config 01.pngOnline configurator.

Data Output

Using the manufacture firmware the data output is:

NodeID Vrms1 Vrms2 Vrms3 Realpower1 Realpower2 Realpower3 Irms1 Irms2 Irms3 Irms4 PF1 PF2 PF3 Temperature

Real Powers are computed using the following rules:

RealPower1 -> CT1 & V1
RealPower2 -> CT2 & V2
RealPower3 -> CT3 & V3

These rules can be modified in the configuration if needed.

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

All outputs type available are

  • Vrms (V)
  • Irms (mA)
  • Real Power (W)
  • Apparent Power (W)
  • Power Factor
  • Estimated Power
  • Frequency
  • Reactive Power
  • Temperature


3Phase sketch

This is the default firmware from manufacture.

3Phase Sketch V1.2

This sketch can be loaded directly from the Raspberrypi following this guide and executing the commands below.

wget lechacal.com/RPICT/sketch/RPICT4V3_3Phase_V5_v1.2.ino.hex
lcl-upload-sketch RPICT4V3_3Phase_V5_v1.2.ino.hex

Related Pages


How to calibrate the Voltage Port

Update RPICT firmware (CT7V1/CT4V3/CT8)