1/9/2024 0 Comments Circuit tools vs. racerender![]() Often, I was in events with timing by transponders which I could compare to the apps timing and realized that, many times, the app lap times were off by a significant amount. Then, after some time, I also started to get frustrated with the cell phone GPS quality. ![]() I used it for some years until buying my first GoPro camera, which dramatically improved the quality of my onboard videos. Yep, Harry's and a good cell phone does the trick for basic lapping and video. Can easily build up from there with other additions (external GPS, GoPro, etc.), but Harry's has been solid for our group. If you're only looking for lap times/video/basic data logging and don't have a GoPro, then this is probably one of the least expensive ways to start. I still go super basic and just use Harry's Lap Timer using my phone camera and a basic short armed Ram mount to the windshield. Note: processing the app files is free, but there is a little fee for processing GoPro files. Check the results below and access to know more. vbo file, which can be used in CT to analyze the driving, with very good quality (of course, quality depends on how good you set up the GoPro). The code I've put together will parse the MLaptimer low res GPS track with the high res GPS track from the camera, sync everything together, and output a csv file for rendering videos with Dashware or RaceRender. By the way, the MLaptimer for iPhone is a really cool app, specially if you consider that the car sensors (but the GPS) are very accurate. All you need is to go out on the track while recording with the GoPro and with the MLaptimer app. It is very straight forward to use, no need for wiring into any ECU neither pairing different devices via bluetooth. Recently, I've put together some code to use a GoPro as video and GPS along with the MLaptimer app. There is another option for those who want to spare some bucks (my case). So while you could wirelessly transfer the files from GoPro into phone I think a direct card reader is faster. GoPro does sync with the phone, but for a whole session if you're recording 1080 60 fps (what my vids are) the total size is something like 8 GB I think, maybe a few more. I have an iphone and can't use a card reader? Doesn't GoPro synch to your phone already? I have a wireless dongle, I'll see if it works. Then, also within RaceChrono you export the sync'd vid with whatever overlay you want to an mp4. It's auto-sync feature works quite well, click one button and done. With this setup, you do need to import the corresponding GoPro vids into your phone (using a portable card reader), then you ID those vid files within RaceChrono to synchronize with the data. Optional: Add a cheap wired lavalier mic to the GoPro, run it through your trunk, and tape it to your license plate for better engine sound.Įverything talks to your phone/RaceChrono pretty seamlessly. RaceChrono + external GPS + wireless OBD2 + GoPro If you just want the basics, I think the following setup (what I use) strikes the best balance between ease of use and what you get:
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