Three timing systems - an overview

No switch, unfortunately

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We ran this setup on five different boards and had trouble consistently logging lap times it was hit and miss. We tried moving the transponder around we tried different angles on different boards with the transponders and to no avail couldn’t get consistent reads. The two race boards were plugged into the receiver which is a 5 volt signal and neither of the race boards would register consistently. The other three were on a battery system and I realize now that the three volts is too low but they were behaving exactly like the others on the 5 volt system inconsistently. Need more time on the system, some tips on how to set it up would be helpful.

Love it - You should be able to find room for the T-race track there :slight_smile:

Where did you put the Lap Counter? on a straight where the deck doesn’t tilt or in a hairpin where the deck tilts and the transducer therefore is not level?
Were the sun (if clear sky) facing the lap counter?

I had mine hooked up to a fully charged 21700, never went under 4.15v. Placement is everything.

The bullbars dont tilt with the deck, which i think helped

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Yup, We did all these things.
Will give it another try this weekend.
That’s a good idea with the bull bar mount.
I was thinking about trying an ankle strap on the front foot .

Do you have GoPro mounts on the stooge nose? If you do We can just 3D print a little platform out of the way of the metal for it to sit on

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Hi, this is Franck from LapMonitor, thanks for your interested in our product and your interesting tests. We recommand you using classical transponders with built-in LED with JR/Futaba or Molex connector depending how you want to connect them.
Miniz transponder are for very small rc cars and their range is much smaller then our classical black model transponders

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Hi @rcfranck! Welcome to the forum.

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Hey! Welcome! I love your product!

If you scroll up you can read my very informal review

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RaceChrono…

I know the RaceChrono system can’t be used inside. But I had to try. Just to see for my self.

GPS trakking was all over the place.

LapMonitor though is working like a charm. I have the counter next to the start / finish line and the a tripod with the connected phone in the pit area. Phone and counter can be up to 80 meters apart.

I can take a lap swing by the pit and look at the lap time and go again. Works really good.

I still need to test it in a multi rider setup. Hope to get the change soon.


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I just learned that the Metr app works with the RaceChrono app. And their gps is 10hz. That’s friking good news!

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I made these things that can hold a generic 18650 battery bank, then all you need to do is use a doner USB cable to extract 5V for the Lapmonitor ™ transponder.

I got fancy right angle USB cables coming in the mail tomorrow, will update.

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Nice. I am still looking for the best solution for me. Would it be using the suggested 1s lipos. or something like this. Will follow your progress.

How many cells does the bank hold?

I made this to be able to hold a pre-made battery bank or a 21700 with a 1SBMS connected to it. I’m going to be using them with the generic USB charger things because I can charge my remote off of it in a pinch, also will be more accessible to those who don’t feel like soldering anything to race their boards

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I bought ten transponders for the LapMonitor system so I can time everyone else.

I needed some kind of protective solution so I can hand out a transponder without worrying that it will brake.

I made this case. Seems to work alright. Will test it.

Will velcro it on the board.

Battery should be enough to power the transponder for 7 hours.

If anyone have an idea for a better mounting solution, hit me.

Next I will make an angle strap. I am skeptical that it will work. But need to test it.




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This one uses a USB battery bank, I can’t find a photo but I have a wire sending 5v to it made

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LapMonitor have a very interesting new feature. You can now share an url for real time / live sharing of lap times and races.

We share the url and everyone can follow anywhere in the world. What an update!!

As for the time being its a beta feature on Android. Hopefully they will make it work on iOS soon.

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Wow that’s super cool! Too bad it’s a bit expensive

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