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 donāt want to use those SCT-013-000 because everything will be in the box and I donāt want to hook anything to any cable!
With my current circuit I use 56ā¦ Burden Resistor and 100K as divider.
So I need to know how can I calculate burden resistor and dividers to work with Emonlib Library.
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?
Take a look at the āLearnā section. How to bias the Arduino input, and how to calculate all the resistor values, is there. Current:
The āquickā method is to choose a burden resistor that will give you as close to but not more than 1.6 V rms (for a 5 V Arduino) at the maximum current that you wish to measure, assuming that your c.t. is suitable, which I think it is. Voltage:
Choose an isolating transformer (the a.c. adapter is one of those) that will give you 1.6 V or more at your maximum mains voltage. You then need to choose 2 resistors (R1 & R2 in the diagram in āLearnā) to give you as close to but not more than 1.6 V rms (for a 5 V Arduino) at your maximum mains voltage.
(Note: the magic number ā1.6 Vā takes into account all the normal tolerances and other factors.)
You can calculate the calibration coefficients that you should use by knowing that the coefficient is the voltage or current that will give you 1 V at the Arduino analogue input.
Thanks a lot
I just calculate based on my CT sensor Datasheet which had 1000:1 turn ratio!
And I donāt want to calculate more than 30A 220v (16A is enough too because every Fuse in my home are 16A), So if my calculations are correct the value is 58ā¦! and this means 56ā¦ is right choice
Please correct me if I wrong!
So, Next Step is Divider resistors! which I do not know how can I choose! on the Learn Section its just wrote more resistance means less power consumption! this means I can use any value?
currently I use 100Kā¦, if I go with 470Kā¦ I will have the same result?
That transformer is OK. Remember that the output voltage is only 9 V at full load. You are effectively using it with no load, so the voltage will be quite a lot higher - I guess between 10.5 and 11.5 V, and it is not specified. You will need to measure the voltage when you get it and then calculate the resistors.