Timeline for LED display Atmega - Running out of output pins
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Jun 4, 2016 at 10:36 | history | edited | Transistor | CC BY-SA 3.0 |
Added Figures 2 & 3 and text.
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| Jun 4, 2016 at 9:12 | comment | added | Transistor | I think not. Read my tri-state points again. You would be putting out 0b1xxxxxx1 and 0b0xxxxxx0. i.e., The 'x' outputs are floating they are neither pulled high or low. You need to look out for sneak paths through all the "off" LEDs. Are there any? | |
| Jun 3, 2016 at 23:41 | comment | added | user83582 | It's clever, but will it really work? The 8x8 led matrix has 64 LED. to light it up, it needs multiplexing anyway. when connected in reverse, won't doing multiplexing on the first led display accidentally turn on the second one? For example, if I want to turn on 2 corner leds from first display, I will use port1=0b10000001, port0=0b01111110; this will also switch on second display. | |
| Jun 3, 2016 at 23:32 | comment | added | Transistor | Um, I've accounted for all seven displays in the OP's question and I referenced and linked Charlieplexing on the last line. | |
| Jun 3, 2016 at 23:12 | comment | added | Dwayne Reid | Add two more displays in the same fashion but connected to Ports 1 & 2. FWIW - this technique is often called "Charlieplexing". | |
| Jun 3, 2016 at 22:35 | history | answered | Transistor | CC BY-SA 3.0 |