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Dim Yellow Green 1.2" 7-seg clock display
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Please be positive and constructive with your questions and comments.

Dim Yellow Green 1.2" 7-seg clock display

by n8kski on Tue Aug 25, 2020 8:51 pm

I'm having an issue identical to the users on these posts:
viewtopic.php?f=47&t=168531
viewtopic.php?f=47&t=110324

i.e., very dim display on max brightness. I do observe subtle differences when varying brightness settings but at max brightness, the display is really only readable in a dimly lit room. I'm powering a nano from my PC's USB. I used a USB power tester with dummy load to verify I can get 2A out of my ports but when the arduino + display are connected, they draw 56mA at max brightness. I can draw over 300mA by adding 3 other HT16K33 quadalpha displays at max brightness. I also saw the 1.2 display had a really hard time when the quadalphas were connected. It was even dimmer and could only light about 2 characters at a time with a bit of a scrolling effect occurring across the display (see image). All displays are connected to 5V pin on nano.
I've attached images of the solder joints as well.
Attachments
combined3.jpg
combined3.jpg (707.26 KiB) Viewed 37 times

n8kski
 
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Re: Dim Yellow Green 1.2" 7-seg clock display

by dastels on Tue Aug 25, 2020 10:35 pm

I'd start by redoing the solder joints. Some look less than ideal, and it's always the first thing I do.

Dave

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Re: Dim Yellow Green 1.2" 7-seg clock display

by n8kski on Wed Aug 26, 2020 8:40 pm

I globbed more solder on but it hasn't made any difference to the brightness of the display
Attachments
resolder2.jpg
resolder2.jpg (340.45 KiB) Viewed 30 times

n8kski
 
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Re: Dim Yellow Green 1.2" 7-seg clock display

by dastels on Thu Aug 27, 2020 11:58 am

Globbing more on isn't the goal, getting good quality connections is. You can have a big glob of solder and still have a poor connection. See https://learn.adafruit.com/adafruit-guide-excellent-soldering.

That said, most of those do look better.

Double check the power and ground lines connections as well.

Powering the Nano (and hence the display) via USB should provide 500mA which should be plenty for the 7-segment display on it's own.

Dave

dastels
 
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Re: Dim Yellow Green 1.2" 7-seg clock display

by n8kski on Fri Aug 28, 2020 6:15 pm

Power and ground connections are good. I moved everything to a different breadboard and used a different set of wires to connect the display. I'm still seeing the same behavior with it

n8kski
 
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Re: Dim Yellow Green 1.2" 7-seg clock display

by dastels on Fri Aug 28, 2020 6:18 pm

OK. Exactly what part in the shop is it?

Dave

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Re: Dim Yellow Green 1.2" 7-seg clock display

by n8kski on Fri Aug 28, 2020 9:31 pm


n8kski
 
Posts: 4
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Re: Dim Yellow Green 1.2" 7-seg clock display

by dastels on Fri Aug 28, 2020 9:33 pm

OK. Please email support@adafruit.com with a link to this thread, your order number, and request the replacement of one Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Green.

Dave

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Please be positive and constructive with your questions and comments.