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16  Using Arduino / Sensors / Differential Connections analog input on: February 06, 2013, 02:45:40 am
Hi

I have to measure the voltage drop over a shunt. It gives 60mV return when full current is passing. I want to measure it with the arduino. So here is the problems i cant really find a good solution for.

The power supply is not the same as the arduino. So i will have to measure it "like a voltmeter" - What op amps can i use to get a higher voltage for the arduino and be able to measure it correctly?

I will also need a higher ADC then the 10bit. Any suggestions that could help solve this project? Needs to be 14-16 bit. I have been looking at adafruits ADS1115 but is out of stock at the moment.

This is my idea;
Analog read max 60mV -> Some kind of gain -> ADC 16bit > Arduino

But really cant figure out what components is out there that will solve my problem.

Regards Mark
17  Using Arduino / Interfacing w/ Software on the Computer / Re: Communication with arduino and OPC/SCADA? on: February 01, 2013, 02:13:57 am
Thanks for the answer. I think i could get the modbus into the SCADA. I will work and try to find a solution with modbus.

If there is anybody else that have done it some other way feel free to contribuete.

18  Using Arduino / Interfacing w/ Software on the Computer / Communication with arduino and OPC/SCADA? on: January 30, 2013, 08:10:27 am
Hi

I posted this in the wrong forum before, so repost here.

Is it possible to get the arduino to communicate to a OPC server? Or is there another way so that i can get the arduino to communicate to scada software like factory talk (Allen-Bradley)

Thank you

Mark
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