Login Register
Back Yard Green Taz RPM Prototype Display
Advanced Search
RSS Feed for this Photo

RPM

1. Shaft ... 5. IR Emitter ... 6. Circuit Done 7. It Works! 8. Prototype... 9. Halfway Done 10. Done 11. Test pattern ... 15. Push-Pull

Random Image

Done

Done

Date: 07/06/09 Views: 6040

Prototype Display

I built a quick prototype display unit. The microcontroller is a PIC18F4550 chip. The T1OSO pin 17 receives the pulse signal from the RPM sensor. The chip's program reads this value three times a second. This value is converted into revolutions per minute and display on the 7 LEDs.

I was not sure how bright I wanted to make the LEDs. So, I decided to use the PWM feature of the PIC18F. The AN0 pin 2 reads a voltage value from a potentiometer. This value is used to scale the Pulse Width of the signal sent out Pin 17 CCP1. This signal drives a TIP120 NPN transistor to sink current from the LEDs.

Date: 07/06/09
Size:
Full size: 1960x1209
nextlast
first previous
Prototype Display
 
 
nextlast
first previous
Powered by Gallery v2.2