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Community => Gigs and Collaborations => Topic started by: abhatia117 on Sep 17, 2020, 01:53 am

Title: Prototype for 7 Segment counter
Post by: abhatia117 on Sep 17, 2020, 01:53 am
Hello!

I am looking to make a counting device using a 7 segment screen.

The casing I am looking at is:
https://www.polycase.com/kt-35

The number I am looking at is:
https://www.alibaba.com/product-detail/E-ERA15012CB-15012-high-light-custom_62142987035.html?spm=a2700.galleryofferlist.0.0.58a7530cndB63r

I have attached a quick drawing I put together using the image of the actual case I am looking at and superimposing the number onto it (estimated to scale). The buttons are just random and I am open to any type of button.

Number 1 should be displayed as green
Number 2 - 9 should be displayed as red

One button should increase the number, the other should decrease. Device should turn off if 'down' is pressed when 1 is displayed on the screen. Device should turn on when 'up' is pressed and no number is displayed on the screen. Nothing should happen if 'up' is pressed and 9 is displayed on the screen.

Goal is for this to be a rechargeable device. I would like the number to dim after 2 minutes of no buttons being pressed.

Thanks in advance for pricing!

(https://forum.arduino.cc/index.php?action=dlattach;topic=705379.0;attach=382048)
Title: Re: Prototype for 7 Segment counter
Post by: CrossRoads on Sep 17, 2020, 04:18 am
Have you located multi-color 7-segment displays yet? Try looking at www.kingbrightusa.com
Title: Re: Prototype for 7 Segment counter
Post by: jimLee on Sep 20, 2020, 09:14 pm
Just use a TFT, pretend its a 7 segment. Heck you could even use a touch screen and loose the buttons?

I wonder if a 3D printed casing would be ok?

-jim lee
Title: Re: Prototype for 7 Segment counter
Post by: abhatia117 on Sep 21, 2020, 08:11 pm
Just use a TFT, pretend its a 7 segment. Heck you could even use a touch screen and loose the buttons?

I wonder if a 3D printed casing would be ok?

-jim lee
Hi jimLee. Thanks for the response. If I use a TFT, would I be able to keep the total cost down to about $6 at 1000 units? 3D printed case will work fine.
Title: Re: Prototype for 7 Segment counter
Post by: jimLee on Sep 21, 2020, 08:59 pm
Costing? $6? Probably not. Also, 3D won't work for doing thousands.

-jim lee
Title: Re: Prototype for 7 Segment counter
Post by: J-M-L on Sep 23, 2020, 01:55 pm
keep the total cost down to about $6 at 1000 units?
You'll have to carve a hole out of your "KT-35 Handheld Electronics Enclosure" top to fit the 1.5 inch 7 segment led display (note that the ones you point at are only in one color, you won't be able to display green and then red). Then you need to drill a hole for the buttons, find a way to fit a battery and a micro-controller (custom PCB likely given the size). You'll also have to think if you want to be able to recharge the battery within the enclosure or end user will have to open the box to swap batteries.

Not sure your BOM + assembly work will be  < $6 .

going TFT would also use up more battery, so you need to also think in terms of how long does the battery need to last.