- Sun May 15, 2016 7:37 pm
#47494
For my project I bought 5 large LED displays. Initially I tried small ones, but they we way too small. They were cheap, these run about $10 shipped: http://www.ebay.com/itm/221957276989
They are i2C and you can address 8 of them. On my pictures see a back of it with A0 A1 A2 pads that can be soldered to designate ones in binary.
The initial address is 0x70 hex, so, next ones would be 0x70 and your custom address on top.
The display runs on 5v but allowes 3.3v logic. It has IO pin, if you provide 5v positive, logic will be in 5v, if you supply 3.3v, then logic will be in 3.3v.
To display a char, imagine 1,2,4,8,16,32 going from top all around in clockwise manner. 1 being "roof" and 64 being middle dash. By adding segment values, you can come up with char values. Thus, digit one is "2+4=7" and digit 8 would be value 127 (a sum of them all).
Here is the code I came up with: http://pastebin.com/SUeRSqga
Here are the damn pictures you are probably dying to see: http://imgur.com/a/wnOQo
Note, I took pics on minimum display brightness.
If you have any questions, ask...
They are i2C and you can address 8 of them. On my pictures see a back of it with A0 A1 A2 pads that can be soldered to designate ones in binary.
The initial address is 0x70 hex, so, next ones would be 0x70 and your custom address on top.
The display runs on 5v but allowes 3.3v logic. It has IO pin, if you provide 5v positive, logic will be in 5v, if you supply 3.3v, then logic will be in 3.3v.
To display a char, imagine 1,2,4,8,16,32 going from top all around in clockwise manner. 1 being "roof" and 64 being middle dash. By adding segment values, you can come up with char values. Thus, digit one is "2+4=7" and digit 8 would be value 127 (a sum of them all).
Here is the code I came up with: http://pastebin.com/SUeRSqga
Here are the damn pictures you are probably dying to see: http://imgur.com/a/wnOQo
Note, I took pics on minimum display brightness.
If you have any questions, ask...
