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1.2" Green 7 segment display flicker
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1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 2:24 pm

Having some flickering issues on the 1.2" 7 segment LED display. I have it hooked up to the I2C backpack but it is flickering a lot. The display is also a lot dimmer than I expected. Is this a connection problem or a soldering problem?

Cipriana
 
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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 2:27 pm

Sounds like a power problem. How are you powering the display?

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 2:31 pm

I am using an ArduinoMega2560 to power it with 5V.

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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 2:34 pm

That should be good. Let's check soldering. Can you post a photo showing the solder job on the backpack.

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 2:53 pm

Hope the quality is ok. I had to crop to fit the file limit.
Attachments
one side.jpg
one side.jpg (417.62 KiB) Viewed 174 times
other side.jpg
other side.jpg (276.26 KiB) Viewed 174 times

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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 4:10 pm

Thanks. It might be worth trying to reflow your solder connections. A few of them look under soldered with possibly insufficient wetting out.
https://learn.adafruit.com/adafruit-gui ... n-problems

These are just some that stand out, but check them all:
soldering.jpg
soldering.jpg (15.89 KiB) Viewed 158 times

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 5:48 pm

I resoldered the pins and the flickering problem persists. Is there anything else I can try?

Thanks!

Cipriana
 
Posts: 8
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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 5:49 pm

Let's check software. Post full code for the sketch you are running.

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 5:53 pm

I am just running the sevenseg example code given from the adafruit github library. I did modify it a bit with matrix.setBrightness(255); , but that is the only change to the code.

Cipriana
 
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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 6:26 pm

Try this and see if you still get the flickering:
Code: Select all | TOGGLE FULL SIZE
#include "Adafruit_LEDBackpack.h"

Adafruit_7segment matrix = Adafruit_7segment();

void setup() {
  matrix.begin(0x70);
  matrix.setBrightness(255);
  matrix.print(8888, DEC);
  matrix.writeDisplay();
}

void loop() {
}

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 6:43 pm

Hmm...nothing happens when I run that code. I can see a faint greeness, but nothing else.

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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 7:17 pm

OK, back to hardware. Can you post a photo of your setup showing how everything is wired together.

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 7:42 pm

Here is my setup. Hope there's a clue to the problem here...
Attachments
Circuit3.jpg
Circuit3.jpg (584.77 KiB) Viewed 120 times
Circuit2.jpg
Circuit2.jpg (749.66 KiB) Viewed 120 times
Circuit1.jpg
Circuit1.jpg (988.24 KiB) Viewed 120 times

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Re: 1.2" Green 7 segment display flicker

by adafruit_support_carter on Mon Aug 12, 2019 8:40 pm

Thanks. Photos always help.

Your breadboard has split power rails. They are not continuous down the entire length of the breadboard. So the display is not being grounded. Jumper the rails or move the wire.
bb.jpg
bb.jpg (48.25 KiB) Viewed 113 times

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Re: 1.2" Green 7 segment display flicker

by Cipriana on Mon Aug 12, 2019 8:52 pm

It works!! Thank you so much for all the help!

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Posts: 8
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Please be positive and constructive with your questions and comments.