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1.2 inch 4-digit 7-segment display not working with raspberr
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Please be positive and constructive with your questions and comments.

1.2 inch 4-digit 7-segment display not working with raspberr

by jamesmerleck on Thu Oct 08, 2020 4:45 pm

Hello,

I ordered this product: https://www.adafruit.com/product/1270 and I received it on October 4th. I soldered it according to the instructions and wired it according to this diagram: https://learn.adafruit.com/assets/87743.

On my Raspberry Pi i2c and SPI are both enabled. I have installed the Adafruit_Blinka library, the HT16K33 library via pip detailed here: https://learn.adafruit.com/adafruit-led-backpack/python-wiring-and-setup-d74df15e-c55c-487a-acce-a905497ef9db

However, running

Code: Select all | TOGGLE FULL SIZE
i2cdetect -y 1

Results in the following:

Code: Select all | TOGGLE FULL SIZE
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --


According to the instructions, i2c 70 should be enabled. I have not seen anything light up in the display or anything else that indicates that it works so far, so I'm not sure if the issue is with my setup or with the hardware itself.

Thanks in advance for any assistance.

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by jamesmerleck on Wed Oct 14, 2020 2:37 pm

Not to be rude but It would be nice to have some kind of assistance getting to the bottom of my issue now that this ticket is almost a week old now. This is my very first purchase with Adafruit and my product, which was fairly pricey for me, simply does not function. It's possible that it's entirely my fault, but I also could have been sold a defective product that I cannot return because I soldered it. It frankly makes me very wary of dealing with Adafruit in the future.

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by adafruit_support_carter on Wed Oct 14, 2020 3:13 pm

Please post a photo of your setup showing how everything is connected. Let's make sure it's not hardware related.

adafruit_support_carter
 
Posts: 17112
Joined: Tue Nov 29, 2016 2:45 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by jamesmerleck on Wed Oct 14, 2020 3:38 pm

Thanks for the reply. Here are my connections:

Top:
Image

Sides:

Image


Image

Breadboard connection:

Image

RPi Connection:

Image


Black to 1: 3v3, connected to 10 on the backpack
Yellow to 3: GPIO2, connected to D on the backpack
Green to 5: GPIO3, connected to C on the backpack
White to 2: 5v, connected to + on the backpack
Orange to 6: Ground connected to - on the backpack

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by adafruit_support_carter on Wed Oct 14, 2020 6:59 pm

Thanks. That all looks OK.

Can you post another photo straight down that shows the main chip as well as the other resistors, all of this:
ht16k.jpg
ht16k.jpg (27.67 KiB) Viewed 51 times

adafruit_support_carter
 
Posts: 17112
Joined: Tue Nov 29, 2016 2:45 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by jamesmerleck on Wed Oct 14, 2020 7:09 pm

Sure, here's the rear side of the backpack:

Image

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by adafruit_support_carter on Thu Oct 15, 2020 5:25 pm

Thanks. That also looks fine. That chip on the back is what will report with an I2C scan. And it's fairly simply connected to the Pi - just directly via the I2C pins.

Have you used any other I2C device on your Pi? (to rule out it being the Pi's I2C port)

And let's double check the soldering here:
solder.jpg
solder.jpg (9.47 KiB) Viewed 39 times

That looks OK but can't tell for sure because of the focus. Those are the only pins that matter for being able to get an address in the I2C scan.

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Re: 1.2 inch 4-digit 7-segment display not working with rasp

by jamesmerleck on Sun Oct 18, 2020 10:19 pm

Thanks. Unfortunately I don't have a second i2c device in order to test that.

Here's as good of picture I could take with my phone:
Image

I had to order some female-to-female DuPont cables in order to directly connect it without the breadboard, so that took a few days.

Image

Image


Running
Code: Select all | TOGGLE FULL SIZE
i2cdetect -y 1
results in the same output as before directly connected:

Code: Select all | TOGGLE FULL SIZE
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by adafruit_support_carter on Mon Oct 19, 2020 11:48 am

Let's just replace it. I'm not seeing anything obviously wrong. That soldering looks OK. It should just show up in the I2C scan.

Send an email to support@adafruit.com with a link to this thread and your order number and they can send you another display.

adafruit_support_carter
 
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Joined: Tue Nov 29, 2016 2:45 pm

Re: 1.2 inch 4-digit 7-segment display not working with rasp

by jamesmerleck on Mon Oct 19, 2020 1:31 pm

Great, thank you very much.

jamesmerleck
 
Posts: 6
Joined: Thu Oct 08, 2020 4:34 pm

Please be positive and constructive with your questions and comments.