Connecting the Splitsecond hardware to Lapcounter hardware
hello Alex
My name is Carsten i`m 26 and from Denmark i`ve just startet racing and it is a lot of fun.
I hav a question for you I want to build a labcounter but I don`t know much about eletronic so the thing is I want to build your LDR sensor system but to trigger a normal counter. Do you know how to do this?
I`ve made drawing of the basic idea. Could you make a drawing for me and tell me what parts to use.
Thanks
Yours friendly
Carsten
His basic idea :
Our Solution :
LAP-COUNTER WITH 7-SEGMENT DISPLAY
This lap counter will give you a reading of the number of laps on a 7-segment display, with any kind of digits as you like.
The schematic is drawn for three digits, but you can add or remove as many digits as you want by just cascading the IC’s (Hey, it’s YOUR lapcounter, so do what ever you like!). This counter will only display a number; it does not count the laps. For the actual counting you will need the schematic with the LDR’s, also on this web-page. That counter will provide a positive pulse whenever the car goes over it. This pulse should be connected to pin 1 of IC3. In the left corner below, there’s a push button to reset the counter, and a push button for a lamp test. Ofcourse the last one is optional. (The first one also but then you will have to drive many rounds before the counter goes to zero).
The 7-segment display used, is a common kathode version. I cannot give you an exact pin out for all kind of displays, because that can differ from display to display. Anyway, if you have a display, find the ground pin (there are often two, in the middle, one at each side). Connect the ground and apply +5V via a 470E resistor to each of the other pins and just see which segment will lit. Remember it’s just a LED so you can fool around pretty much before it breaks!
The IC’s used are all CD4033B or HEF4033B, or whatever prefix but make sure you get the B-version as the A version will probably go up in smoke. To be honest, I did not build this circuit but I’m quite sure it will work. Nevertheless, if you have any kind of problem whith it, please let me know and I’ll fix it.
Components used:
IC1, IC2, IC3: xx4033B
C1, C2, C3 100nF ceramic
Examples for 7-segment displays: (height 10mm)
Yellow: MAN5360
Green: MAN5460
Red: MAN5760
Happy lap-counting!
