Need help on 8 current sensor signal to RS232 signal to read by controller

[strameshkumar]

Hello EE,
I am using 8 current sensor to measure 208V AC current of each line. I have only one digital input pin to read all teh eight signal.
current sensor 1:1000 ratio for 10A.
I have converted to voltage level of 5V. circuit.
All the 8 sensor voltage signals need to be converted to serial input signal to my controlller to read.

What is the circuit i can use ?
Please provide me some circuit or digital conversion methods.

Thanks in Advance
Ramesh

 

[AnalogKid]

You will need more than one line. If the eight 5V circuits are analog, then you need an A/D comnerter since you say your controller has a digital input. You can have 8 A/D converters, or one converter with a 8:1 analog multiplexer in front of it. either way, you have to know how many bits of resolution you need to accurately convey your signal.

For a serial interconnect such as RS-232, I2C, SPI, etc., you need at least two digital signal pins at the controller (plus a ground). At the other end you need power, a microcontroller with a matching interface, something smart enough to control the multiplexer, tell the A/D when to start a conversion cycle, determine the end of a conversion cycle, and transmit both the digital data *and* information saying which sensor the data is coming from back to the system controller.

There are several ways to do each part, some easier than others, but this is not a simple project.

ak