They all have a 10k pull down resistor to GND. They are connected to the analog pins of the Arduino. I use an Arduino nano to do all the hard work.įor the actual sensing of the cars I used 3 light sensing resistors in the 3 lanes. I didn't make pictures or diagrams of how I build it, so all I can do here is explain the idea and share the code. The second (more complicated) system shows your time on a display on the back of the finish. The LED colors green when you are first, doesn't go on when you're second and goes red when you're last. System one is the two color LEDs that show immediately when a car crosses the line in what place he finished. I also glued a L-profile on the length of the bottom to make it easy to use a table as a stand for the track. I had to vile some material off the startbutton, to make it work. Print the parts and glue and bold it all in place like you see on the pictures. 1 Block to put the start-button on (3D printed).You can download this program for free and edit the files if you want. These parts are also easily to make from wood, but I have a 3D-printer, so I might as well use it.Īll added 3D-files are 123D-Design files. I printed 5 parts for het starting system. Now it was time for me to make some use of my 3D-printer. Cut a slit in the middle of the 3 tracks starting (at least) 175 mm from the edge of the track. You will need enough track above the start to put the cars. The start and the finish part will be essentially the same, only the start part won't have the aluminum L-profiles on them.ĭecide where you want your cars to start. It is wise to make the profiles extend just a little more than the strips (I didn't do this) Glue the L-profiles on the bottom of the track on the side where the strips are extending.Weigh it all down and wait for it to dry.Glue the 4,5 cm strip on the track, using the clamped templates and the extra 4,5 cm part as a guide.Clamp the 27,5 mm templates on the edge of the 30 cm plywood.2 20 x 5 mm aluminum L-profiles that are 15 cm long (I used J-profiles).I want the guide tracks to overlap the next track-part so I extended them a track width (45 mm) forward. To make het even easier, I made some templates from 55 mm wide and some 27,5 mm wide. To make it even easier for myself, I had the plywood precut from the store, so that gave me (for all the tracks): Making the 6 straight track-parts is very easy.
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