My moving message display 245 LED that I engineered back in 2006 does not flicker at 20Hz.You need to go back and do the test.
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My moving message display 245 LED that I engineered back in 2006 does not flicker at 20Hz.You need to go back and do the test.
Then you need to explain why. Or how.My moving message display 245 LED that I engineered back in 2006 does not flicker at 20Hz.
Project that I did back in 2006: https://www.picbasic.co.uk/forum/showthread.php?t=6033Then you need to explain why. Or how.
Do you update the LED at 20hz but leave the LEDs on 100% of the time? It may be like the movies, 20hz update but 60hz flashes.
My advertising sign back in the 80s used multiplex LEDs at 120hz. It there was no multiplexing then 20hz is fine.
Have used them. There is no flicker. The LED current is continuous.zxld1360
Have used them. There is no flicker. The LED current is continuous.
My moving message display 245 LED that I engineered back in 2006 does not flicker at 20Hz.
I agree that 20Hz is not the best, but unfortunately with my project there is time taken to read from the serial EEPROM. Usually, however, though -- when I multiplex displays I will scan the columns / digits as fast as possible. Another project I have made which uses multiplexing to deal with 4 digit 7-segment displays runs much faster than 20Hz (I do not know the scan rate but it is probably several KHz:The eye has persistence when the object or eye does not move, so everyone's perception depends on the test conditions & criteria.
There are also longer term effects. Just stare a a bright Yellow LED and watch it change colour, then view the sky for a ghosted complimentary colour dot.