Using Multiple CTs with an arduino Uno

SmokyMcWire · 30 July 2019 12:29

Hi all,
I am attempting to set up my Arduino uno to monitor multiple wires using SCT013 sensors.
However I am struggling to find info on how to use more than one CT sensor.
If some one could point me in the right direction it would be greatly appreciated.
Cheers

SmokyMcWire · 30 July 2019 13:12

The ole classic posting for help too soon,
found what I needed, figured I should share it anyways.
https://openenergymonitor.org/forum-archive/node/5533.html

Robert.Wall · 30 July 2019 13:56

Hello Smoke, and welcome to the OEM forum.

I hope you read right to the bottom of that thread, because Photonut really did not understand C++ classes and how emonLib works.

Just to emphasize the point, look at any of our emonTx default sketches on Github - the most straightforward is probably this

github.com

openenergymonitor/emonTxFirmware/blob/master/emonTxV3/noRF/emonTxV3_DirectSerial/emonTxV3_DirectSerial.ino

// EmonTx V3 Direct Serial example
// AC-AC adapter must be used with this example (highly recomneded for more accurate Real Power calculations)
// Useful for direct connection to Raspberry Pi or computer via USB to UART cable 
// Forum thread: http://openenergymonitor.org/emon/node/3872



// Tell emonLib this is the emonTx V3
// - don't read Vcc assume Vcc = 3.3V as is always the case on emonTx V3
// - eliminates bandgap error and need for calibration http://harizanov.com/2013/09/thoughts-on-avr-adc-accuracy/
#define emonTxV3

// Include Emon Library
#include "EmonLib.h" 

// Create four instances
EnergyMonitor ct1, ct2, ct3, ct4;

unsigned long lastpost = 0;
const byte LEDpin=                          6;                               // emonTx V3 LED

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