AZDelivery ACS712 30A Amp Current Sensor Range Module Current Sensor compatible with Arduino including E-Book!

It functions well, but is not designed for 30A. The connector is 10A max and cannot take cables big enough for 30A. There are no mounting holes in the boards received unlike the picture in the product description which shows 2 holes.

Brilliant in that you can monitor current to a motor or coil or fan etc and if the current gets too big use the Arduino or Pi to turn the device off -- before any damage occurs. This little board is a must really for any circuit that pumps a lot of amps (like 2A or more) and is controlled by software. Use PWM = 0 to turn off the current is one way.

I wanted to be able to monitor currents using an Arduino circuit. These are just the job. Take various currents and simple to install, with isolation between the measured current and the rest of the circuit.

Works perfectly and great value. The instructions with it were great too!

Not accurate enough. Noisy values. Switched to INA219.

Don't know where to start but this 30A unit is crazy on a number of levels - it has a connector which if you read the markings state 10A. The pcb tracks are tiny so definitely won't hold 30A current. Also the pcd tracks are so close together that you will no doubt have cross arching even if you did put 30A through this.