jrz126
Active Member
I need some help with a (hoopefully) simple circuit for the leds I have mounted in my roof of my car. Heres alittle background first...
The leds are controlled by 8 bit shift registers with transistor arrays connected to the 8 outputs to provide the high current. I then control the shift in bit and clock bit using a couple 4017 Counters (used as a frequency divider). The clocks of the counters are controlled by a LM3915 VU meter IC which is connected to my subwoofer amp. So the LEDs change with the music.
I'm looking for a circuit that has a 5VDC square wave output. which changes frequency over time. (ie. it starts running at say 10 Hz then it increases slowly to say 50 Hz. over a period of 15 seconds, then it goes back to 10Hz and repeats).
I know a PIC would be excellent for this job, but I dont have any idea how to program one. (I'll be taking a microprocessors class next fall though ). So right now I'm hoping for a simple solution.
If you need any more information or have any extra questions please ask. I'd greatly appreciate the help.
The leds are controlled by 8 bit shift registers with transistor arrays connected to the 8 outputs to provide the high current. I then control the shift in bit and clock bit using a couple 4017 Counters (used as a frequency divider). The clocks of the counters are controlled by a LM3915 VU meter IC which is connected to my subwoofer amp. So the LEDs change with the music.
I'm looking for a circuit that has a 5VDC square wave output. which changes frequency over time. (ie. it starts running at say 10 Hz then it increases slowly to say 50 Hz. over a period of 15 seconds, then it goes back to 10Hz and repeats).
I know a PIC would be excellent for this job, but I dont have any idea how to program one. (I'll be taking a microprocessors class next fall though ). So right now I'm hoping for a simple solution.
If you need any more information or have any extra questions please ask. I'd greatly appreciate the help.