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### Topic: How to calculate burdon and divider resistor value? (Read 619 times)previous topic - next topic

#### sonixax

##### Jan 12, 2018, 02:08 am
Hi Everyone
I just want to make my own Current and Voltage monitoring system using Arduino!
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

#### jremington

#1
##### Jan 12, 2018, 02:19 amLast Edit: Jan 12, 2018, 02:29 am by jremington
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 at Adafruit.

#### TomGeorge

#2
##### Jan 12, 2018, 01:42 pm
Hi,
OPs image;

Tom...
Everything runs on smoke, let the smoke out, it stops running....

#### MarkT

#3
##### 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.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### TomGeorge

#4
##### 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...
Everything runs on smoke, let the smoke out, it stops running....

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