Arduino Forum

Using Arduino => General Electronics => Topic started by: sonixax on Jan 12, 2018, 02:08 am

Title: How to calculate burdon and divider resistor value?
Post by: sonixax on Jan 12, 2018, 02:08 am
Hi Everyone :)
I just want to make my own Current and Voltage monitoring system using Arduino!
I Already made one but it can only calculate current!
So, I have This CT censor (TALEMA INDIA 51/16 AC1030) and don't want to use those SCT-013-000 because everything will be in the box and I don't want to hook anything to any cable!
With my current circuit I use 56Ω Burden Resistor and 100K as divider.
So I need to know how can I calculate burden resistor and dividers to work with Emonlib Library. (This tutorial: https://learn.openenergymonitor.org/electricity-monitoring/ctac/how-to-build-an-arduino-energy-monitor)

Here is my Current circuit: http://www.the-diy-life.com/simple-arduino-home-energy-meter/

Should I use the same resistors and values for my circuit?
also Can I use Voltage sensing value output as input in current calculation code to have better results?

Thanks a lot and have a lovely day :)
Title: Re: How to calculate burdon and divider resistor value?
Post by: jremington on Jan 12, 2018, 02:19 am
If you use a different CT sensor or resistor than in the tutorials, the best approach is to calibrate the system.

I do that by placing the CT sensor over one wire to an AC socket, and plug in various known wattage loads, like a 100 Watt light bulb, a 1000 W room heater, etc.  Then observe the Arduino output and calculate a "best fit" scale factor.

Excellent tutorial on sensor calibration (https://learn.adafruit.com/calibrating-sensors/why-calibrate) at Adafruit.
Title: Re: How to calculate burdon and divider resistor value?
Post by: TomGeorge on Jan 12, 2018, 01:42 pm
Hi,
OPs image;
(https://i2.wp.com/www.the-diy-life.com/wp-content/uploads/2016/11/energy-meter-wiring-diagram.png?w=692)

Tom... :)
Title: Re: How to calculate burdon and divider resistor value?
Post by: MarkT on Jan 12, 2018, 07:48 pm
Datasheet for the sensor?

I would recommend only using sensors with a built-in burden resistor since operating one with a burden
resistor is dangerous.
Title: Re: How to calculate burdon and divider resistor value?
Post by: TomGeorge on Jan 12, 2018, 10:54 pm
Datasheet for the sensor?

I would recommend only using sensors with a built-in burden resistor since operating one with a burden
resistor is dangerous.
"without a burden resistor is dangerous"



Tom... :)