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> Connecting Multiple Signals To Adc
yamadanao
Posted: July 11, 2017 11:13 am
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I am designing a signal conditioning circuit which reads in data from 20 sensors and output it to the ADC of a microcontroller. My problem is I don't really understand how to connect these signals into the microcontroller due to the limited number of pins available (8 pins because the microcontroller comes with a 8 channel analog MUX).

Here is the ds18b20 datesheet


Currently, my idea is to group the sensors into 5 groups, each containing 5,4,4,4,3 sensors respectively. Then, use connect each group of sensors to one pin of the 8-channel ADC. I'm not sure if this idea is feasible nor am I aware of the hardware available to do so. Please advice!

Some basic information of the microcontroller is listed below for your reference:

12-bit
Sampling frequency: 200 ksamples/s
Clock speed: 24MHz
Conversion time: 50 clock cycles

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Nothing40
Posted: July 11, 2017 04:56 pm
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DS18B20 temp sensors aren't analog,they're digital "1-wire" sensors.
You can connect all 20 of them to one digital pin.
You may want to study the datasheet for them a bit more. smile.gif


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