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21 lines
970 B
Markdown
21 lines
970 B
Markdown
5 years ago
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HiFiLOGIX Utilities
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The following sketches have been created to aid you should you decide to build
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and use HiFiLOGIX for your own system.
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# Analog Switch Matrix Helper
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This literally just reads the value returned by the ADC on A0 and displays it to
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the serial console.
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It is recommended that you take these measurements with a pull-down resistor on A0.
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Upload the sketch, open serial monitor. You should either see a bunch of 0's if you
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have a pull-down resistor connected; or some wildly changing numbers if you don't.
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Stick a resistor between A0 and 5V. The ADC in the ATMega will spit out a number
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between 0 and 1023 and display it on the console. I really can't stress enough how
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much better this works if you have a pull-down on A0.
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In theory you could calculate all this out by figuring out what voltage the A0 pin
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would see in the voltage-divider you're creating; then figuring out what it's 5-bit
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sampled value would be. But that's a pain in the ass.
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