148: Friday 23rd July 2010

Last weekend I managed to find some time to mount the 9 blue ultra-bright LEDs behind the numbers of the rev counter in my instrument cluster for the instantaneous amps x 100 bargraph display. I also reworked the LEDs in the state-of-charge gauge that I have mounted behind the fuel gauge mask. It now has 4 red, 1 blue, then 5 green indicators. It seems to work o.k. now after a little bit of tweaking. When the indicators are red then the car will be running slower and I need to get it on charge. Now with 10 LEDs I can tell much easier when that time is approaching. It still drops down when I am driving, but when I release the throttle pedal I can get a good reading. I am not going to fix this quirk as when I have my matrix display working, it will just be rough guide. The photo below shows the 9 blue LEDs mounted.
The next photo shows the ribbon cable connected. I used the same connector strip as the state-of-charge gauge, so to give it a quick test I swapped them over and the blue LEDs light up nicely. I shall post another photo when I have built up the sensor circuit and bar graph driver for this display. I checked the data sheet for the hall effect current sensor and it needs a 5v regulated power supply, so that is another little circuit I need to build. Progress will be slow but steady now as time and money are at a premium.

No comments:

Post a Comment