Race Starter,Timer and Speed Measure-Hot Wheels diecast cars

Race start sequence, then show winner for Hot Wheels diecast cars. Displays race time, both car real speed and winning difference in ms.

Feb 8, 2021

9509 views

8 respects

Components and supplies

4

Resistor 220 ohm

1

Buzzer, Piezo

4

5mm LED IR Emitter

1

Resistor 100 ohm

1

Arduino Nano R3

2

Through Hole Resistor, 390 ohm

4

Resistor 10k ohm

2

5 mm LED: Green

1

Alphanumeric LCD, 16 x 2

1

Wire, Wrapping Wire

1

Approx A3 Perspex coloured sheet

4

5mm LED IR Receiver

Tools and machines

1

Saw

1

Multitool, Screwdriver

1

Solder Flux, Soldering

1

Soldering iron (generic)

Project description

Code

Race Timer/Start Finish Line Code

arduino

Downloadable files

speedtraplogo_575uywYBWU.png

speedtraplogo_575uywYBWU.png

speedtraplogo_575uywYBWU.png

speedtraplogo_575uywYBWU.png

Comments

Only logged in users can leave comments

Anonymous user

2 years ago

My 12-y.o. and I just built this. It works great! The schematic and design were perfect.. It took maybe 4-5 hours to build, mostly doing the wiring for the LEDs and sensors. It works great on cars and we've had a lot of good races. We've also used it to measure Nerf speeds. The time resolution at Nerf-like speeds isn't as good as it is for cars, but it's still very reliable at catching the dart as it passes. The default sensitivity settings worked fine. A couple of minor comments: - Final device size is 12 cm on each side. We were able to cut all the parts out of a 12 cm x 60 cm Perspex sheet, 3 mm thickness. I used an Arduino Nano Every, on a breadboard. - There are a few quirks in the version of the code as posted. A) The RHS scale speed does not display at all (or rather, it's printed on top of the LHS speed). To fix, there's SetCursor(10,0) command in line 360, which should be (10,1). B) The scale speed only prints three three digits (e.g., 1002 kph is truncated to 002 kph). It's pretty easy to exceed this. To fix, change the formatting in lines 345 - 365. - The biggest problem was shoving all of the wires inside the case when done! I cut them all far too generously. - The LCD we have appears to match the one you link to in the description, but I had to use a different driver to get it to work. - As an upgrade, I may add a switch to restart the clock, rather than wait for it to time out. The switch could also toggle it between two-track mode, and single-track mode. Oftentimes we don't need both tracks -- we just want to measure speed along a single track.

Anonymous user

2 years ago

Like the timer love it

cooksprojects

2 years ago

Thank you! Hope you have as much fun using the timer as we have.

Anonymous user

2 years ago

My 12-y.o. and I just built this. It works great! The schematic and design were perfect.. It took maybe 4-5 hours to build, mostly doing the wiring for the LEDs and sensors. It works great on cars and we've had a lot of good races. We've also used it to measure Nerf speeds. The time resolution at Nerf-like speeds isn't as good as it is for cars, but it's still very reliable at catching the dart as it passes. The default sensitivity settings worked fine. A couple of minor comments: - Final device size is 12 cm on each side. We were able to cut all the parts out of a 12 cm x 60 cm Perspex sheet, 3 mm thickness. I used an Arduino Nano Every, on a breadboard. - There are a few quirks in the version of the code as posted. A) The RHS scale speed does not display at all (or rather, it's printed on top of the LHS speed). To fix, there's SetCursor(10,0) command in line 360, which should be (10,1). B) The scale speed only prints three three digits (e.g., 1002 kph is truncated to 002 kph). It's pretty easy to exceed this. To fix, change the formatting in lines 345 - 365. - The biggest problem was shoving all of the wires inside the case when done! I cut them all far too generously. - The LCD we have appears to match the one you link to in the description, but I had to use a different driver to get it to work. - As an upgrade, I may add a switch to restart the clock, rather than wait for it to time out. The switch could also toggle it between two-track mode, and single-track mode. Oftentimes we don't need both tracks -- we just want to measure speed along a single track.

Anonymous user

4 years ago

idk what to say to this but good job puto

adin1234

4 years ago

Like the timer love it

cooksprojects

2 years ago

Thank you! Hope you have as much fun using the timer as we have.