Using analog channels as digital
Hi
The number of digital pins on the IND.I/O is not enough for my project. I would like to use the analog pins as digital ones (by reading the analog value and treat everything above 50 % of the voltage range as digital 1). But the analog section is only intended for up to 10 Volts. My system works on 12 V. Is it possible to connect 12 V to the analog inputs or will they get damage
I
Hi, you can use a voltage divider with resistors to reduce the 12V to e.g. 8V with a 20K/10K voltage divider.
12V <10K resistor> 8V (connect to analog channel) <20K resistor> GND
One customer even wrote some code to multiplex several digital inputs to 1 analog channel, see https://github.com/DG2RDD/eControls-BMS-Dry-Contacts-Multiplexer-for-Industruino
Hi,
I guess I'm the customer refered to by Tom ... Just ask if you want some up-to-date code, we have been tinkering a bit with it lately.
Didier, DG2R
Thank you so much!! I am considering to update the hardware and will notify you when approved by my manager!
Hi
My goal is to avoid special Hardware hacks. Otherwise, a voltage divider is the best way to go. But I interpret your answer as that the analog channels will damage if voltages above 10 V are applied.
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| Asked: 8/23/20, 11:56 PM |
| Seen: 1689 times |
| Last updated: 8/24/20, 6:09 AM |
Thank you Tom. is it needed to calibrate the DAC/ADC even for digial usage?