RPICT3V1

• 3 AC current sensor
• 1 AC Voltage sensor.
• Compute real power.
• Fit on Raspberrypi 2 holes mounting pattern.
• Attiny84 Mcu

Recommended sensors

• AC Current sensor: SCT-013-000
• AC Voltage sensor:
  • UK: 77DB-06-09
  • EU: 77DE-06-09
  • US: 77DA-10-09 or CT3957-NA

EmonCMS Output

Using the default sketch the output will be
NodeID Realpower1 Realpower2 Realpower3 Irms1 Irms2 Irms3 Vrms

• RealPower in Watts
• Irms in MilliAmps
• Vrms in Volts

Sketch

Version 1.0

If you wish to use the board as a RPICT3 without any use of the voltage use the sketch below. Note power will be estimated power only.
No Voltage Version 1.0

View the data with Python

Please note the uploaded sketch must have CSV enabled. 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/ttyS0', 38400, timeout=1)
ser.open()

try:
       while 1:
               response = ser.readline()
               z = response.split(",")
               if len(z)>=6:
                       print "RealP 1: %s Watts" % z[0]
                       print "RealP 2: %s Watts" % z[1]
                       print "RealP 3: %s Watts" % z[2]
                       print "Power 1: %s Watts" % z[3]
                       print "Power 2: %s Watts" % z[4]
                       print "Power 3: %s Watts" % z[5]
                       print "Vrms   : %s Volts" % z[6][:-2]
except KeyboardInterrupt:
       ser.close()

Related Links

How to calibrate the Voltage Port