For my current project I have a Arduino wired to 5 externals modules that requires a precise 5V input (CT measurement). The cable between the Arduino and theses modules will be a 4x0.22 mm² of about 1.5 meters long.
My questions are the following :
Can I create a clean 5v from a 9v AC to DC transformer inside my Arduino case (regulator + capacitor) and power up the Arduino and all modules from there without having loose in my modules voltages ?
Or should I transport 9v to each module and create the 5v current onto each module board ?
Also, which type of regulator should I use ? They will be enclosed in a small box, I don't know how much heat 9v to 5v are going to generate.
I only have a bit of electronic experience on bread board, I have never deployed a project in real world situation, so I am bit confused about the best practice to use.
- I would like a voltage precision of +/- 0.1v
- My externals modules are also homemade, they are basically composed of a AC relay and a CT. My precision need is for the CT voltage measurement.
- The only component drawing current in my modules is the relay, so at the maximum 5x 90mA + the arduino consumption (with Ethernet Shield).