Microcontroller › 8051 › problem with the counter up down › are you using the same
May 28, 2013 at 9:24 pm #9852
are you using the same schematic as mentioned there ?
the method implemented there is called as persistence of vision. so your project might be working and 7 segment leds are glowing with very less intensity. (although transistors are used there to increase source current this shouldn’t be happening). try using red gelatin or glass type material to overlay 7 segment.