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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 4 years ago
Posts: 7410
 

@the-apprentice FYI @davee Here is a link to Bills (dronebot-workshop) article and video, maybe that will help, it does use the UNO for power.

https://dronebotworkshop.com/led-displays/#Display_Types

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.


   
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(@davee)
Member
Joined: 3 years ago
Posts: 1794
 

Hi Ron @zander,

  Thanks for the link to Bill's (@dronebot-workshop) article. Please note how he carefully describes popular configurations with common anode, common cathode, 1, 2, 4 or more digits in the same package and so on. Whilst these often follow the same pinout patterns, current and voltage requirements, etc. there are no 'rules', so it is important to have data describing the device you actually have on the bench. (Or be prepared to diagnose the device and risk damaging it - I am not supporting this suggestion.)

Best wishes, Dave


   
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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 4 years ago
Posts: 7410
 

@davee Which suggestion are you NOT supporting?

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.


   
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(@davee)
Member
Joined: 3 years ago
Posts: 1794
 

Hi Ron @zander,

  RE: Which suggestion are you NOT supporting?

In short, for any project, any question for which the questioner fails to provide full data (direct link or included snapshot) of all of the relevant parts and circuit, as well as test software when appropriate.

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This is not because I wish to be awkward, but because, in the absence of a full 'information pack', any answers are quite likely to be inappropriate and incorrect.  

Of course, this rather stark statement sounds very unfriendly, and don't intend to be unfriendly. I am normally happy to prompt for specific missing data, in the same way that I would do in a face-to-face conversation, but, in general, I do not think it is fair to be expected to do basic research, such as identifying a data sheet for an obscure part someone has chosen to use, or to have to guess what circuit someone has on their bench, based on a video that is only referenced as being "by Bob", who I have never heard of.

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With regard to the 7-segment LED options, all of them can be made to work, given enough work, and the requisite information. The pinout can usually be deduced from bench tests, provided the person doing the testing understands the likely possibilities, and can provide suitable test voltages, etc., but the operational current limits can only be found in the data sheet.

In addition, displays with more than 1 digit, are often multiplex driven, which can add a level of complexity, as well as increasing the current demands. A small, single digit display, can often be directly driven by a microcontroller, but increasing the digit size, and increasing the number of digits, both tend to increase the current demand, which may necessitate the need for an additional driver chip. (This has been previously discussed in relation to the 'widget counter project' a few months ago.) I would recommend fully determining this part of the design, before ordering any components, as it is necessary to ensure the selection of components are compatible with each other, and the requirements of the project.

Best wishes, Dave


   
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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 4 years ago
Posts: 7410
 

@davee It would sure make things easier if we had ALL the required information. The other thing that makes helping difficult is some folks do not answer questions, and some do not follow instructions. I hate to say it, but that is simply rude and disrespectful. I bring over 50 years of varied experience and I think you and a few others do as well. I think it's time to use that unsubscribe button.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.


   
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