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Woody
Joined: 11 Sep 2003
Posts: 85
Location: Warmenhuizen - NL
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| Quick question about ADC in a PIC18F04Q41 |
 Posted: Fri Dec 05, 2025 9:13 am |
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I am either experiencing a senior moment or I never understood how channel switching for the AD converter works.
Before I elaborate on what the problem is, can I ask: do you need to issue a | Code: | | set_adc_channel(sAN2); |
before every read of an ADC value? Also if I am only interested in on input channel? |
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Woody
Joined: 11 Sep 2003
Posts: 85
Location: Warmenhuizen - NL
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| Posted: Fri Dec 05, 2025 9:44 am |
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Yep, senior moment.
Reading my own question back I noticed the 'sAN2' and thought, that cannot be right....
And indeed, changing this to | Code: | | set_adc_channel(2); |
solved my problem.
My excuses for the stupid question. |
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temtronic
Joined: 01 Jul 2010
Posts: 9600
Location: Greensville,Ontario
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| Posted: Fri Dec 05, 2025 1:43 pm |
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| don't feel bad.... at 72 ALL my moments are 'senior' ! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19995
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| Posted: Sat Dec 06, 2025 12:34 pm |
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It is also a very common one.
The sANx designations are used for the setup, to specify which channels
are to be connected to the multiplexer. The set_adc_channel command
then just selects the numbered channel from the multiplexer you want
to read.
I suspect many of us have made that mistake at least once.....  |
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