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  • ScavangeR87 commented on ernie666's instructable Laser Sensor Timer6 months ago
    Laser Sensor Timer

    Just registered to tell that I did this as my first electronic project. As I was not really confident in my skills, I just made a couple of the first sensor (w/o the latching) and got it to work fairly easily. Thanks @Ernie666 !I Made it to be used for Roller skating speed slalom. The run lenght is about 28m (~92Ft) and we got 2 lanes side by side. So i had to build each sensor twice. Derivation worked just fine so i managed to get a "Start" case with both sensors and a "stop case" with both sensors too.Then i built 4 Transmitters.Since the lenght of wire would have been a pain to manage, I came up with the idea of a RJ45 connection. I had long enought wire available for free and get the RJ45 connectors from old computers motherboards. So instead of wirring my reeds ...see more »Just registered to tell that I did this as my first electronic project. As I was not really confident in my skills, I just made a couple of the first sensor (w/o the latching) and got it to work fairly easily. Thanks @Ernie666 !I Made it to be used for Roller skating speed slalom. The run lenght is about 28m (~92Ft) and we got 2 lanes side by side. So i had to build each sensor twice. Derivation worked just fine so i managed to get a "Start" case with both sensors and a "stop case" with both sensors too.Then i built 4 Transmitters.Since the lenght of wire would have been a pain to manage, I came up with the idea of a RJ45 connection. I had long enought wire available for free and get the RJ45 connectors from old computers motherboards. So instead of wirring my reeds straight to the stopwatches I soldered them to pin 1&2 for lane 1 and 7&8 for the lane 2. This way, i got only 1 wire by case for both lane. Then i Hacked 2 stopwatches, soldering start/stop button to a couple of RJ45 connectors and put everything in a nice case.Eventually i wanted to wired up everything to my computer. A developer friend of mine, helped me to program a little software with specific needs of our sport. Here is how i got my sensor working with my computer:I simply get an old usb keyboard and hacked it. Got ride of the plastic case and buttons and kept only the electronics part.At the bottom of it, you'll get connectors. Each keys is a combo of 2 of them. Hook whats left of your keyboard and try each combo (IE in a notepad) till you identify the key binded to your start function in your software. Do the same with the stop function. Once you get the needed keys, just solder (can be tricky) your reeds on them instead of soldering them on a stopwatch.In my project i soldered 2 RJ45 connectors so it can work with my setup.To finish this , I'm really sorry for my english. It's clearly a mess and maybe everything isnt crystal clear, But if you have any question, feel free to ask me. I'll try to get things with differents words or pictures :)PS: 1st picture: Sensors Wired to Stopwatches (Lane one stopwatch is missing on the picture x) )2nd picture: The interface Sensors > Computer from an old KeyboardExtra: A video of Sensors working with my software > https://youtu.be/FtvuAD_tA40

    Hi ! I'm working on it and got it working with old IDE conectors wire.Cheap (you can get it from free in all computer store if you ask nicely) and with only 1 IDE connector you got all the wire needed for the project.To connect each sensors and stop watch I used RJ45 connectors and wires. You can get this for cheap too (connectors from every old network devices, and wires are decently priced).Hope it can still help you :)

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