Timeline for Drive multiple LEDs ON together using PIC Microcontroller
Current License: CC BY-SA 3.0
17 events
| when toggle format | what | by | license | comment | |
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| Nov 23, 2016 at 1:01 | answer | added | IstvanK | timeline score: 1 | |
| Feb 25, 2016 at 15:53 | comment | added | user101095 | thank you, that's right, I would have to revise my requirements or will require more IO pins to drive this in parallel.. | |
| Feb 22, 2016 at 8:00 | comment | added | jwsc | At this point I am inclined to say that your requirements can not be met. You don't want to drive those 20 LEDs in parallel, because too many pins. You don't want to multiplex them, because too low brightness. Any Port extenders, working off PWM, Serial, I2C are too big and too costly for you. So I have to conclude that I am out of ideas. Maybe you should revise your requirements. Maybe you could change your design to fewer LEDs. Maybe incorporating the brightness in your display? | |
| Feb 22, 2016 at 5:33 | answer | added | Matthew Pang | timeline score: 0 | |
| Feb 22, 2016 at 0:46 | comment | added | user101095 | I am aware about the port expanders but would like to avoid them if I can to reduce the cost and layout space on board.. | |
| Feb 22, 2016 at 0:45 | history | edited | user101095 | CC BY-SA 3.0 |
added 350 characters in body
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| Feb 22, 2016 at 0:38 | comment | added | user101095 | Sorry for the confusion and thank you for your feedback..I don't want to turn all 20 LEDs on/off at the same time..These LEDs are level indicators and as per the user input, I need to turn each next level indicator LED ON by keeping all lower level indicators ON as well, as level is increased by user and turn off each highest level LED off one at a time, as level is decreased by the user.. | |
| Feb 21, 2016 at 22:19 | history | edited | Chetan Bhargava | CC BY-SA 3.0 |
removed unnecessary tail
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| Feb 21, 2016 at 22:16 | comment | added | Passerby | There is 16 and 24 bit port expanders. And you could always use a second PIC as a port expander. | |
| S Feb 21, 2016 at 22:06 | history | suggested | Korozjin | CC BY-SA 3.0 |
Erroneously stating that the LED's were in series
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| Feb 21, 2016 at 21:34 | answer | added | Transistor | timeline score: 3 | |
| Feb 21, 2016 at 21:16 | answer | added | Peter Bennett | timeline score: 0 | |
| Feb 21, 2016 at 21:09 | review | Suggested edits | |||
| S Feb 21, 2016 at 22:06 | |||||
| Feb 21, 2016 at 21:05 | comment | added | Marla | This is confusing : "connecting all 20 LEDs in series and hooking the anode to the rail (~ 30V) and connecting cathode of each LED to a PIC I/O pin" If the LED's were in series, you would only need one I/O pin to turn them on (using a transistor to buffer your Output pin) | |
| Feb 21, 2016 at 21:04 | answer | added | Korozjin | timeline score: 1 | |
| Feb 21, 2016 at 20:58 | review | First posts | |||
| Feb 21, 2016 at 21:02 | |||||
| Feb 21, 2016 at 20:54 | history | asked | user101095 | CC BY-SA 3.0 |