Is a Multiplexing ADC the Best Solution for My University Project?

AI Thread Summary
For a university project involving 9 hall effect current sensors with a maximum output of 25mA, the user is considering using an analog multiplexer to cycle through the inputs before converting them to digital signals with a single ADC. The evaluation board has a serial input port, raising questions about the necessity of a multiplexer. Suggestions include exploring ADCs and multiplexers with I2C interfaces or using a microcontroller with built-in ADC inputs, such as the PIC 18F2455. An Arduino board is also mentioned as a potential solution due to its available software resources. Understanding the evaluation board's capabilities and the required programming skills is essential for project success.
Callum121
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Hi

For my final year university project, I have an array of 9 hall effect current sensors producing a maximum current output of 25mA each. They're producing an analog output which I need to convert into digital signals so I can process them using an evaluation board and C++ code.

At the moment I'm thinking about using an analog multiplexer to cycle through the 9 inputs (using C++ code somehow?) one by one, then using an a single input ADC to convert them to digital signals.

Is there such a thing a multiplexing ADC?

The evaluation board has a serial input port.. so would I even need a multiplexer? I'm a bit confused..

Any thoughts?


Thanks!

Callum121

p.s The manual for the evaluation board I am using can be found at:
http://www.analog.com/static/import...854542ADSP_21065L_EZ_KIT_Lite_Manual_Rev2.pdf
 
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I had a quick look at the manual, and it seems your board has an expansion connector intended to be used with analogue front-ends; it also seems to support I2C
I would look into ADCs and multiplexers with I2C interfaces.
 
You could also use a micro-controller with multiple ADC inputs -- e.g., the PIC 18F2455 has 10 10bit inputs -- basically it is one ADC with a front end multiplexer built in. But that means a lot of new programming skills to acquire. Or an Arduino hobby board might have enough inputs and has a lot of available software already.
 
Thanks for the advise!
 
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