AC Current Monitoring

 

*** A FeatherWing / Particle compatible board needs to be developed ***

 

 

Under Development

Non-Invasive AC Current Sensor - 30A

WARNING: Always make sure to ground one of the current transformer (CT) output wires when it’s under load.   If the CT is around a wire with current flowing through it, and the secondary side of the CT is not grounded, huge voltages can get induced inside the CT and it can damage te CT and possibly explode.

Helpful measurement calculation & sampling info.

Arduino EmonLib library

Use and links to mfg of current transformers (USA)

Hooking up CT to Arduino

 

Low Cost Three Phase Current Sensing with Short Circuit and Overload Detection

HCPL-788J Isolation Amplifier with Short Circuit and Overload Detection

MOC3020 optocoupler

FODM453 shielded optocoupler

Three Phase AC Voltage Measurement using Arduino - bridge rectified

Sinusoidal Frequency Meter using Arduino - bridge rectified 4N35 (2N35)

OPTOCOUPLER CIRCUITS

 

isolated zero-crossing detector circuit 2N3904 4N35

Use 1N4148 diodes for the above circuit

Use use 4 resistors of 100k in place of the 2x 220k resistors; rated properly; 230Vac (rms) = 310Vpk = 620Vp-p

Another write up of the same circuit

 

NI voltage, current, power measurement tutorial

 

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Projects

FeatherWing