Can someone please help me create a simple 7-segment number display? [see below for details]
My name is Simon. I'm a member of the Classic Celica Club of Victoria (Australia) that competes in an anual event called the Winton 6hr Regularity Relay.
It's a 6 hour long track event with about 40 teams and 6 cars per team.
Each team has one car on the track for the 6 hours.
Prior to the race, each car nominates a time that they believe they can consistently do for their share of the race (usually approx. an hour each).
Points are awarded for each lap achieved that is within 1 second of the nominated time. Points are deducted for any lap that is faster than the nominated time.
The thing is THE DRIVERS CANNOT CARRY ANY FORM OF TIMING DEVICE IN THE CAR.
The aim :
To build a board that clearly displays a 3 digit time. (eg: 1min 56sec). Team members will time the car on the track and then use the board to display the time for the driver to read as they pass by the pit wall. (note: this practice is not against the rules).
The requirements :
The board must be big enough, and clear enough, to be read from >75m away.
The adjustment of the board must be very quick and intuitive. (the task of timing is shared around and there's no time to train people to use the device).
The board must be light enough to be held by outstretched arms.
No timing device is required in the board itself. The time displayed on the board isn't always the time that is recorded. Adjustments are sometimes made for one reason or another.
Scrolling through the numbers is fine, so long as you can scroll both up and down.
Each digit should be completely individual (ie: not linked).
[see attached images]
I was thinking of using a typical 7-segment display layout made up of 79 x 10mm LEDs.
The actual physical construction of the board is well within my ability. It's all the circuitry that i am clueless on. I am a total newbie so please be gentle when describing electronics.
I'm new to instructables but i have spent quite a few hours searching this site for answers. The thing i've found is that my device is far simpler than anything posted on here but i'm still too much of a newb to work out how to do it.
ps: I hope i have posted in the correct section.