Connect analog in to 5V pin

RafaeleAndrade

giuliomoro , Is it possible to connect analogue pins to the 5v pin on mini bela?

giuliomoro

You can safely connect a 5V signal to the analog inputs. Why do you want to connect them directly to the analog input though? They will read a saturated "1" value (actually 0.9999985). I do not recommend using the 5V as the voltage reference for analog sensors (e.g.: FSR or pot), because it's significantly noisier than the 3v3 line.

RafaeleAndrade

I have been using 3x 3.3 voltage and gnd pins for my instrument and for some reason, my minibela isnt booting if I wire the voltage and gnd pins of the potentiometers with the ones from the TrillCraft.

Indeed it could work but doesn´t seem really the best option.

ps: Minibela has 2x 3.3V connectors, one I am using for the sound. It didn´t sound good to mix that one with another signal.

giuliomoro What do you recommend me to do here?

giuliomoro

RafaeleAndrade ps: Minibela has 2x 3.3V connectors, one I am using for the sound. It didn´t sound good to mix that one with another signal.

the two 3.3V pins carry the same signal so they can be used interchangeably.

RafaeleAndrade I have been using 3x 3.3 voltage and gnd pins for my instrument and for some reason, my minibela isnt booting if I wire the voltage and gnd pins of the potentiometers with the ones from the TrillCraft.

This sounds like some miswiring issue. What is the behaviour when "not booting"?

RafaeleAndrade

giuliomoro It seems I have a problem in my new connections of 8 potentiometers.

The bela doesn't boot if the 3.3 and GND wires are connected, if the bela is already working and I try to run a project I receive this message:

make: *** INTERNAL: readdir: Input/output error. Stop.

giuliomoro

So that could be a consequence of a temporary voltage drop on the 3.3V line which casused the SD card to be remounted read-only. What are you connecting to the 3.3V line exactly? You may be drawing too much current.

RafaeleAndrade

giuliomoro I also tried to connect only the potentiometers and they also not work

RafaeleAndrade

giuliomoro I am connecting the trill and one mic as usual

RafaeleAndrade

PS: I have just connected one pot in this example.
alt text

RafaeleAndrade

More findings:

It seems the last 4 slides give me a problem, when I connect them I get these message and I cant even shut down the bela:

touch: cannot touch '/tmp/sclang.yaml': Read-only file system
rm: cannot remove '/tmp/sclangfifo': Read-only file system

giuliomoro

RafaeleAndrade touch: cannot touch '/tmp/sclang.yaml': Read-only file system

Same issue as above. Double check that you are wiring the sliders properly. Disconnect them from the Bela and from each other and use a voltmeter to measure the resistance between the pins. There will be two pins between which the resistance value you read is close to the nominal one and doesn't change as you move the slider. These are the pins you should use for GND and 3v3. Verify on each pot individually that those pins are indeed correct and there is no malfunctioning.