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Will Raspberry Pi Pico work with Quad Alphanumeric Display?
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Will Raspberry Pi Pico work with Quad Alphanumeric Display?

by JPJ on Sat Jan 22, 2022 7:29 pm

I've been successfully driving the 7 Segment Display with Raspberry Pi Pico and backpack, but tried the alpha4numeric today https://www.adafruit.com/product/1912 and it works perfectly from an Arduino Uno but garbage is displayed when used with the Pico. Exact same code on both. Photos follow. I checked and have the latest library releases for Adafruit_GFX and Adafruit_LEDBackpack. Thanks!

Code: Select all | TOGGLE FULL SIZE
#include <Wire.h>
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4();

void setup()
{
  alpha4.begin(0x70);
  alpha4.writeDigitAscii(0, 'A');
  alpha4.writeDigitAscii(1, 'B');
  alpha4.writeDigitAscii(2, 'C');
  alpha4.writeDigitAscii(3, 'D');

  alpha4.writeDisplay();
}

void loop()
{
  delay(500);                       // wait for a second
}
Attachments
IMG_0336.jpeg
IMG_0336.jpeg (214.53 KiB) Viewed 96 times
IMG_0337.jpeg
IMG_0337.jpeg (163.21 KiB) Viewed 96 times

JPJ
 
Posts: 24
Joined: Fri Jun 20, 2014 7:01 am

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by adafruit_support_carter on Mon Jan 24, 2022 3:15 pm

Try moving this pin to 3V3 OUT instead of VBUS:

pins.jpg
pins.jpg (28.56 KiB) Viewed 78 times

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Posts: 23520
Joined: Tue Nov 29, 2016 2:45 pm

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by JPJ on Mon Jan 24, 2022 3:27 pm

Thanks for the reply and suggestion. Unfortunately same exact results as shown in first photo I attached above, meaning same exact LED elements illuminated.

JPJ
 
Posts: 24
Joined: Fri Jun 20, 2014 7:01 am

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by JPJ on Mon Jan 24, 2022 3:28 pm

p.s. I also have a RED Alphanumeric display, same exact results.

JPJ
 
Posts: 24
Joined: Fri Jun 20, 2014 7:01 am

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by adafruit_support_carter on Tue Jan 25, 2022 9:01 pm

Something does seem up with that combo. I've recreated this and opened a new issue for it here:
https://github.com/adafruit/Adafruit_LE ... /issues/68

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Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by JPJ on Tue Jan 25, 2022 10:29 pm

Thank you! I very much appreciate your support!

Regards,
JpJ

JPJ
 
Posts: 24
Joined: Fri Jun 20, 2014 7:01 am

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by JPJ on Sat Jan 29, 2022 8:33 am

RESOLVED

Update Earle Philhower's Ardinuo Pico Board library to 1.19.5 and tested. Characters display normally as expected now.

Thank you!

JPJ
 
Posts: 24
Joined: Fri Jun 20, 2014 7:01 am

Re: Will Raspberry Pi Pico work with Quad Alphanumeric Displ

by adafruit_support_carter on Sat Jan 29, 2022 11:54 am

Cool. Glad that fixed it. Thanks for letting us know. Have fun!

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Please be positive and constructive with your questions and comments.