RPI LCT4V3

Link to shop

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

The RPI LCT3V1 has been specifically designed for large CT of 400A and more. CT connector are screw terminal types as opposed to jack connectors.

• 4 AC current sensor
• 3 AC Voltage sensor.
• Compute real power.
• Fit on Raspberrypi 2 holes mounting pattern.
• Attiny84 Mcu
• Use with 400A CT

Compatibility

Version	Compatible?
Raspberrypi 1 A	Yes
Raspberrypi 1 B+	Yes
Raspberrypi 2 B	Yes
Raspberrypi 3 B	Yes
Raspberrypi 3 B+	Yes

Recommended sensors

• AC Current sensor: SCT-024
• AC Voltage sensor:
  • UK: 77DB-06-09
  • EU: 77DE-06-09
  • US: 77DA-10-09

Configuration

See general instructions for configuration below:

Configuration over serial for sketch version 1.2.

View the data with Python

Please note the configuration must have Emonhub format enabled (format=3). The example script below will be a good starting point.

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.

#!/usr/bin/python
import serial
ser = serial.Serial('/dev/ttyAMA0', 38400)

try:
       while 1:
               response = ser.readline()
               z = response.split(" ")
               if len(z)>=7:
                       print "Vrms 1: %s Volt" % z[1]
                       print "Vrms 2: %s Volt" % z[2]
                       print "Vrms 3: %s Volt" % z[3]
                       print "RealP 1: %s Watt" % z[4]
                       print "RealP 2: %s Watt" % z[5]
                       print "RealP 3: %s Watt" % z[6]
                       print "RealP 4: %s Watt" % z[7][:-2]
except KeyboardInterrupt:
       ser.close()

Emoncms Config (Emonhub)

For default configuration.

 [[11]]
   nodename = my_RPICT3V1
   hardware = RPICT3V1
   [[[rx]]]
      names = Vrms1, Vrms2, Vrms3, RP1, RP2, RP3, RP4
      datacode = 0
      scales = 1,1,1,1,1,1,1
      units = V,V,V,W,W,W,W

Using the default sketch the output will be
NodeID Vrms1 Vrms2 Vrms3 RealPower1 RealPower2 RealPower3 RealPower4

• RealPower in Watts
• Vrms in Volts

Sketch

Units are sold flashed with sketch for use with Voltage sensor.

Usage with Voltage sensor

Version 1.0
Version 1.1
Version 1.2

Usage without Voltage sensor

If you wish to use the board without using the voltage sensor use the sketch below. Note power will be estimated power only using fixed voltage setup in configuration.
No Voltage Version 1.0
No Voltage Version 1.1

Once the sketch uploaded write the configuration as follow:

$ wget lechacal.com/RPICT/config/A0/rpict3t1.conf
$ ./lcl-rpict-config.py -w rpict3t1.conf

* rpict3t1 above is not a tipo

Related Pages

How to calibrate the Voltage Port

Use Emonhub with RPICT

Howto setup rpi3 for CSV reading

How to program an Attiny85 or Attiny84