32u4 pins not isolated?

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jhf5167
 
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32u4 pins not isolated?

Post by jhf5167 »

Wondering if anyone else has come across this issue, it seems to me like for some reason just on this one board I'm not getting reading properly. All I need is a few buttons to read, but it is just acting weird. Buttons on non-sequential pins to make sure it's not me being dumb, pressing any button gives readings on all others. Tried different wires, different buttons, still same thing. Checked with a meter to see if there were any shorts, no issues there. Any ideas?

Thanks for taking the time to read this.

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dastels
 
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Re: 32u4 pins not isolated?

Post by dastels »

Do you have pullups turned on on those inputs?

Dave

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

Yep, tried both with and without pull-ups on all inputs.

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adafruit_support_bill
 
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Re: 32u4 pins not isolated?

Post by adafruit_support_bill »

And how do you have your buttons wired? If wired to GND, you need pullups. If wired to VCC you need pull-downs.

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

All wired to gnd

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adafruit_support_bill
 
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Re: 32u4 pins not isolated?

Post by adafruit_support_bill »

If you post your code - along with some photos showing all your soldering and connections, we'll see if we can spot the problem.

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

No the prettiest connections coz I was already annoyed about it not working and just threw a bunch of different cables at it (btw the one strand that looks like it goes down in the second pic is cut right there and is far from touching anythign else)

EDIT: wow my photography skills aren't great, that green wire connected to nothing is soldered to the the jst connector down the other side not to gnd

This is pretty much the code I was using to test, tried every variation of this (mostly using analogRead to see if it would tell me anything), tried increasing the time between reads with delay() but that didn't help either:

Code: Select all

//int val1 = 0;
int val3 = 0;
int val5 = 0;
int on = 0;
void setup() {
//pinMode(1,INPUT_PULLUP);
pinMode(3,INPUT_PULLUP);
pinMode(5,INPUT_PULLUP);
}

void loop() {
 on = 0;
 //val1 = analogRead(1);
 val3 = analogRead(3);
 val5 = analogRead(5);
 Serial.println(val3);
}
Attachments
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IMG-7373-min.JPG (605.53 KiB) Viewed 103 times
IMG-7372-min.JPG
IMG-7372-min.JPG (860.51 KiB) Viewed 103 times
Last edited by dastels on Mon Aug 15, 2022 9:21 am, edited 1 time in total.
Reason: Add code tag

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adafruit_support_bill
 
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Re: 32u4 pins not isolated?

Post by adafruit_support_bill »

For reading switch inputs, you should use digitalRead. I believe analogRead automatically changes the pinmode to INPUT.

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dastels
 
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Re: 32u4 pins not isolated?

Post by dastels »

Bill's right. Using analogRead will remove the pullup.

Dave

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

When I have digitalRead, it just gives a 1 no matter what.

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sj_remington
 
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Re: 32u4 pins not isolated?

Post by sj_remington »

Use your multimeter to verify that a switch actually connects the input to GND, when the button is pressed.

In one photo, it appears that the switches are wired via a blue wire to RST instead of GND.
Last edited by sj_remington on Sun Aug 14, 2022 10:15 pm, edited 3 times in total.

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dastels
 
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Re: 32u4 pins not isolated?

Post by dastels »

jhf5167 wrote: Sun Aug 14, 2022 8:39 pm When I have digitalRead, it just gives a 1 no matter what.
Yes, it sounds like your switches are either miswired or not working.

Dave

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

Just tested again with multimeter, all connections seem to be fine. Definitely connected to gnd. Tried with probably 10 switches now, all having the same thing happen.
I think I have a spare nano somewhere, I'll try move everything to that probably this weekend and see if that works

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dastels
 
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Re: 32u4 pins not isolated?

Post by dastels »

Can you post your current code?

Dave

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jhf5167
 
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Re: 32u4 pins not isolated?

Post by jhf5167 »

This is the most recent:

Code: Select all

int val1 = 0;
int val3 = 0;
int val5 = 0;
int on = 0;
void setup() {
pinMode(13, OUTPUT);
//pinMode(1,INPUT_PULLUP);
pinMode(3,INPUT_PULLUP);
//pinMode(5,INPUT_PULLUP);
}

void loop() {
 //on = 0;
 //val1 = digitalRead(1);
 val3 = digitalRead(3);
 //val5 = digitalRead(5);
 Serial.println(val3);
 /*if (val1 == 0){
    on = 1;
 }
 if (val3 == 0){
    on = 1;
 }
 if (val5 == 0){
    on = 1;
    }
 
 if (on == 1){
    digitalWrite(13,HIGH);
    }
 else{
    digitalWrite(13,LOW);
    }
  */
}

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