Arduino Nano buttons Limit | MobiFlight | Page 1

fickle osprey Mar 16, 2026, 5:16 PM

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What ?? I just need to add 2 more buttons... There is a solution please ?

livid basalt Mar 16, 2026, 5:18 PM

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And what pins are you planning to use for them?

fickle osprey Mar 16, 2026, 5:18 PM

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D3 and D2

livid basalt Mar 16, 2026, 5:19 PM

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If you have 18 buttons, that should already have taken up all pins...

fickle osprey Mar 16, 2026, 5:20 PM

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No, some button need 1 pin (ON-ON) and some button need 2 pin (ON OFF ON)

livid basalt Mar 16, 2026, 5:20 PM

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12 digital pins (D2-D13) and 6 analog pins that can be used for digital I/O (A0-A5)

fickle osprey Mar 16, 2026, 5:20 PM

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Im using analog pin for my switches

livid basalt Mar 16, 2026, 5:21 PM

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A6/A7 only work with potentiometer inputs

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that's a limitation of the Arduino Nano, nothing we can do about it

fickle osprey Mar 16, 2026, 5:21 PM

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Maybe a multiplexer ?

livid basalt Mar 16, 2026, 5:21 PM

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multiplexer should work. Shift register too

fickle osprey Mar 16, 2026, 5:48 PM

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I watched a lot of tutorials and I don't understand how I have to wire it, I have a 16 multiplexer. I have three cables, they have to become 1 cable. Is it possible ?

livid basalt Mar 16, 2026, 5:55 PM

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you need four digital pins as address lines as well, so it is more like turning seven lines into 5

fickle osprey Mar 16, 2026, 5:56 PM

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so how can I wire it ?

restive acornBOT Mar 16, 2026, 5:57 PM

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👉 Check out this wiki page for information on using multiplexers with MobiFlight:
Beginner's guide to input multiplexers

fickle osprey Mar 16, 2026, 5:58 PM

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thanks

restive acornBOT Mar 16, 2026, 5:58 PM

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👉 Check out this wiki page for information on using input shifters with MobiFlight:
Adding lots of buttons with an input shift register

dreamy herald Mar 16, 2026, 5:58 PM

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@fickle osprey what commands you want to use fo ON-On switches?

fickle osprey Mar 16, 2026, 5:59 PM

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? I don't understand

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commands ?

dreamy herald Mar 16, 2026, 6:00 PM

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What you want to do with those switches?

fickle osprey Mar 16, 2026, 6:01 PM

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light panel

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dreamy herald Mar 16, 2026, 6:01 PM

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aaahok, nevermind, I misread on the phone one of your previous messages

fickle osprey Mar 16, 2026, 6:01 PM

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No problem

amber oyster Apr 10, 2026, 10:38 PM

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Just a thought,... You could use A6 and A7 for switches by fooling them into thinking that they're conncted to potentiometers.

amber oyster Apr 10, 2026, 11:21 PM

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Your switch is probably an SPDT center off type, right?
So here we tie A6 high with a pullup resistor. When the switch is in that center off position, the Nano sees a potentiometer that's putting out 5 volts, so it returns an input value of 1023.
When you flip the switch to the up position, A6 is now connected to both the pullup resistor and to ground through R2. The Nano now sees a potentiometer that's sitting in it's middle position and returns a value around 512.
When you flip the switch the other way, A6 is now connected to ground through the switch. (don't worry, our good friend R1 will keep this from being a dead short) What the Nano sees is a potentiometer turned all the way down and returns a value of 0.
In the MobiFlight configuration, you'll need to do a little coding to tell the sim what you want it to do when the value equals each of those conditions, but you've just fooled it into accepting a couple of switch inputs on those pesky analog input only pins...

south latch Apr 11, 2026, 2:16 PM

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amber oyster Your switch is probably an SPDT center off type, right? So here we tie A6 high w...

Sure, that should work. I think a two position switch would only require one resistor. You could wire a rotary switch with a resistor ladder too.

#Arduino Nano buttons Limit