![]() (I added a LED in the button, just for fun) I also added a button to be able to reset the system. ![]() Each is connected (with a resistor) to two digital pins on the Arduino. On the front, the bridge has 3 LEDs, one above each lane that can light up in red or green. Three white LEDs in the bridge above them make sure they have enough light to "see" the cars. 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)
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March 2023
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