I am using an Arduino Mega to control the speed of an AC pump. This can be done by connecting to the variable frequency drive. Here is a link of the relevant datasheet, pages 66 and 67 relate to what I am doing.
From what I have read and been told already, I should be able to control this using a 4 - 20 mA loop, which is fed into AIN2, as long as I connect the 0V terminal as well?
My question is what is the best way to make a current loop transmitter using an Arduino Mega.
So far the options I have are:
- Create a circuit out of discrete components, this would then be controlled using the Megas PWM
- Use an IC circuit, I was looking at the AD694JNZ
- Use an add on board, I was looking at this one: http://uk.rs-online.com/web/p/products/8828929/?grossPrice=Y&cm_mmc=UK-PLA--google--PLA_UK_EN_Semiconductors-_-Semiconductor_Development_Kits&mkwid=sm9dTYvCc_dc|pcrid|88057061283|pkw||pmt||prd|8828929&gclid=CjwKEAjwk6K8BRDM3aCSkdCtzSQSJAA3Vf38mNs9lZrg2A1AjrVpS3SCubT0AbAr7L8OImUZbfCPzRoCIXjw_wcB
I have a budget for my project so cost is not an issue, however I am running out of time. What would be the easiest method to implement and how?
I have been thinking of using options 2 or 3, however my issues are that this is my first Arduino project. I understand what PWM is but I don't know how I would go about implementing it. I also can't find any tutorials online that demonstrate how to program the MIKROE board using an Arduino.
Thank you in advance for any help :)