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Multichannel ADC chip

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SimonST:
Hi!

I started a project to get better at non-RF electronics and I am looking for an IC or design trick.
I wanted to try to build pyrotechnic firing system for fun. It is basically a box which provides power to different outputs depending on a control signal, to the outputs you connect an e-match which when about 500mA-1000mA is provided for a short while it burns. One nice feature to include is the ability to measure the resistance of an e-match. With that information you can deduce if you most likely have connected the correct pyro to the correct port or not and the health of the e-match. The level of accuracy needed is quite low. everything below .1ohms is considered a short, then measure which range the circuit is in 1 to 5 ohm, 5 to 10 ohm, 30-50 Ohms or >50Ohms. The measuring current has to be below 10mA.

Does anyone know of a cheap multichannel (8-16 channels) ADC that could do something like this? Or some other way to do it. I imagined it would be easy to find a chip used for multi select buttons but have not been able to find one. Any tips?

ataradov:
A lot of modern MCUs will have at least 8 channels. Put a couple of them to get 16.

SAM D09 in QFN-24 package is $1 in single quantity and has 10 ADC channels, for example.

MasterT:
ADC has to be interfaced with a uCPU, and based on the question I think OP is not ready yet to design PCB for QFN.  Better to get arduino MEGA2560, there a lot of examples and finished projects like that.

Bassman59:
Do you need simultaneous sampling or can you deal with sequentially sampling each channel?
Do you need to read data from all channels simultaneously or can you read each channel’s result sequentially?

jaycee:
Microchip MCP3008 has 8 channels. Cascade 2 of them to get 16 channels. They are SPI devices so you can control them with an Arduino easily.

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