View source for RPICT and Node-Red hosted on Raspberrypi



Make sure any program using the ttyAMA0 serial is off (emonhub, python programs etc).

We assume a fresh install of Raspberry Pi OS in this document.

Make sure the steps to setup the serial port have been completed first.<br>
[[Howto setup Raspbian for serial read]]

Install Node-Red as follow

 sudo apt-get install nodered

Start Node Red

 node-red-start

You will see a similar message to this below at the top

 Once Node-RED has started, point a browser at http://192.168.1.206:1880

Open a browser and go the indicated address. http://192.168.1.206:1880 for us here.

How to setup Node-Red depends on what the user wants to achieve. We will show a simple example here to split the data from the serial string.

Start to build a flow with a ''Serial Input'' a ''Function'' block and ''Debug'' output.

[[File:Rpictnodered_002.png]]

Now setup the serial port as shown below:

[[File:Rpictnodered_001.png| 300px]]

Then enter the java script in the function. Make 3 outputs are selected. Modify the script to your needs. We will just provide NodeID the First Real Power and Vrms from a RPICT7V1.

[[File:Rpictnodered_003.png| 300px]]

The code is here below for copy paste.

 var output = msg.payload.split(" ");
 
 var NodeID = parseInt(output[0]);
 var RP1    = parseFloat(output[1]);
 var Vrms   = parseFloat(output[15]);
 
 var msg1 = {payload : NodeID};
 var msg2 = {payload : RP1};
 var msg3 = {payload : Vrms};
 
 return [msg1, msg2, msg3];

The right pane debug will show the split values.

[[File:Rpictnodered_004.png| 300px]]