RPICT4T4

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

• 4x AC Current Sensors
• 4x DS18B20 Temperature Sensors
• Attiny84 Mcu

Current Sensor

Recommended sensor: SCT-013-000

Burden Resistor: 24 Ohm

Connector: 3.5mm Jack

Default Voltage for power calculation: 240V (can be modified in firmware).

For AC current only.

Temperature Sensor

Connector: 3.5mm Jack

The intended temperature sensor is the DS18B20 which can be configure in either parasite or normal mode.

The connection to a 3.5mm jack connector is shown below.

NOTE: Raspberrypi must be switched off while connecting and disconnecting the temperature sensor.

Configuration

Starting from sketch version 1.4 the RPICT4T4 is configured over serial.

See general instructions for configuration over serial.

Python Example

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)

try:
       while 1:
               response = ser.readline()
               z = response.split(",")
               if len(z)>6:
                       print "Power 1: %s Watts" % z[0]
                       print "Power 2: %s Watts" % z[1]
                       print "Power 3: %s Watts" % z[2]
                       print "Power 4: %s Watts" % z[3]
                       print "Temperature 1: %s C" % z[4]
                       print "Temperature 2: %s C" % z[5]
                       print "Temperature 3: %s C" % z[6]
                       print "Temperature 4: %s C" % z[7][:-2]
except KeyboardInterrupt:
       ser.close()

Files

Sketch version 1.2

Sketch version 1.3

Sketch version 1.4