View source for RPICT3V1 Sketch version 1.3 documentation

This is the archived documentation for firmware 1.3 of the RPICT3V1.

Make sure to check your firmware version using the command

 lcl-show-header.py

==Default Data Output==

Using the default sketch '''version 1.3''' and below the output is <br>
 NodeID Realpower1 Realpower2 Realpower3 Irms1 Irms2 Irms3 Vrms
* RealPower in Watts
* Irms in MilliAmps
* Vrms in Volts


==Restore Default Config==

You should have received a key when acquiring the unit. Use this key to download and restore the default configuration.<br>
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

==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.
This is below for '''sketch 1.3''' and below.

<syntaxhighlight lang="python">
 #!/usr/bin/python3
 import serial
 ser = serial.Serial('/dev/ttyAMA0', 38400)
 
 try:
        while 1:
             # Read one line from the serial buffer
             line = ser.readline().decode().strip()
 
             # 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])
                 elif i in [1,2,3]:
                     print ("RealPower %d: %s W" % (i, Z[i]))
                 elif i in [4,5,6]:
                     print ("Irms %d: %s mA" % (i, Z[i]))
                 elif i==7:
                     print ("Vrms: %s V" % (Z[i]))
                        
 except KeyboardInterrupt:
        ser.close()
</syntaxhighlight>





==Emoncms Config (Emonhub)==

For default configuration with sketch '''version 1.3'''.

  <nowiki>[[11]]</nowiki>
    nodename = my_RPICT3V1
    hardware = RPICT3V1
    [[[rx]]]
       names = RP1, RP2, RP3, Irms1, Irms2, Irms3, Vrms
       datacode = 0
       scales = 1,1,1,1,1,1,1
       units =W,W,W,mA,mA,mA,V


[[File:rpict3v1_channel_emoncms.png]]



==Sketch==

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

===Usage with Voltage sensor===

[http://lechacal.com/RPICT/CT3V1/RPICT3V1_v1_0.ino Version 1.0]<br>
[http://lechacal.com/RPICT/CT3V1/RPICT3V1_v1_1.ino Version 1.1]<br>
[http://lechacal.com/RPICT/CT3V1/RPICT3V1_v1_2.ino Version 1.2]<br>
[http://lechacal.com/RPICT/CT3V1/RPICT3V1_v1_3.ino Version 1.3]<br>

===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.<br>
[http://lechacal.com/RPICT/CT3V1/RPICT3V1_noV_v2.0.ino No Voltage Version 2.0]

Once the sketch uploaded write the configuration as follow:

 $ wget lechacal.com/RPICT/config/A2/rpict3v1.conf
 $ lcl-rpict-config.py -w rpict3v1.conf
<small>Output will be in AMps. Change VEST in config from 1 to 240 or 110 to get estimated power.</small>



==Related Pages==

[[Howto setup Raspbian for serial read]]

[[Gen3_Passive_Component_Setup]]

[[How to calibrate the Voltage Port]]

[[How to program an Attiny85 or Attiny84]]

[[Use Emonhub with RPICT]]

[[Flash RPICT Attiny84 with Arduino UNO]]

==FAQ==

More generic FAQ are here.
[[Frequently Asked | Frequently Asked Questions]]

===Why are there 3 Vrms output for only 1 Voltage port?===
The RPICT3V1 computes power using associated pairs for Current/Voltage (CV pairs). The result of this computation gives Vrms Irms ActivePower etc.
The CV pairs in the RPICT3V1 are <br>
P1-> CT1/V1<br>
P2-> CT2/V1<br>
P3-> CT3/V1<br>

The output reports the result of Vrms for each of these computation. We do expect the three Vrms values to be the nearly the same with a small diffrence because there are computed at a different time.

In practice for voltage monitoring you should just use one of the three Vrms. 

However if you need to know precisely which Vrms was used when computing a given Active Power then make sure you compare it against the Vrms it is associated with.