Go Back  R/C Tech Forums > General Forums > Radio and Electronics
RCHourglass DIY Lap Timing (AKA Cano revised) >

RCHourglass DIY Lap Timing (AKA Cano revised)

Like Tree160Likes

RCHourglass DIY Lap Timing (AKA Cano revised)

Old 05-08-2024, 04:24 AM
  #1021  
Tech Regular
Thread Starter
 
Join Date: Mar 2015
Posts: 311
Default

RCHourglass Manager does it for you. You can find in the source code. openAST in not 100% accurate. Having said that, if you want to 'forge' new numbers they will probably NOT work on Mylaps decoders, because it seems that even the number itself has some kind of CRC.
mv4wd is offline  
Old 05-12-2024, 07:52 AM
  #1022  
Tech Initiate
 
Join Date: Mar 2014
Posts: 34
Default

Originally Posted by gusdepaulasd
Guys, I finally managed to test the equipment on the track.
It worked perfectly, no missed laps, no fastama transponders detected.
I used the original decoder for the loop I used the MLA30+, 4.5m * 0.3m loop.
It worked fantastically, I'm very happy.
After a long time I managed to make everything work perfectly.

I have some questions that I think you can help me with.

1st, how could I put an LCD display on the decoder to show the transponder number that passed, number of hits, etc...
I saw that some people managed it but I didn't find how I could do it.

2 This question is simpler, lol.
The mla30+ has a beasing tee, I could incorporate this beasing tee together with the decoder so that it is outside my decoder box instead of the loop box itself.
I honestly don't think there will be any problems because everyone who uses the mla30 places this beasing tee glued to the decoder box, but it's better to ask than to have to do unnecessary work.

I thank everyone.
hello,

sorry i'm a bit late ....

i already made an LCD + Arduino :

RCHourglass DIY Lap Timing (AKA Cano revised)

you can take my code il the links ....

Have fun
zouky23 is offline  
Old 05-29-2024, 01:28 AM
  #1023  
Tech Rookie
 
Join Date: Apr 2024
Location: Lower Bavaria
Posts: 3
Default

Last week we did tests with the Decoder and Transponder. Instead of the original Amplifier i use a modified MLA30+ (changed sma plug to BNC and power it directly without the BiasTee)
Registering mylaps Transponders worked fine.
I only have always low Hits at the Software, around 1 or 2, only when cars passing by slowly, hits increase to 10-20 or more. This happens with MyLaps and self built Transonders. And sometimes cars are not recognized when passing loop. And i got ghost-Numbers from the Transponders too. Unfortenaly i did not have my oscilloscope by me on the track.
Back at the workbench i did again tests with the oscilloscope. Here is a screenshot of TP8 and the feedback pin.
Next days i will go back to racetrack with the oscilloscope. Any ideas what can i test test/optimize? Thank you very much for help!
h*ttps://ibb.co/Gxy89JM
h*ttps://ibb.co/yPMPSSY
Thomas@SBR is offline  
Old 05-29-2024, 04:19 AM
  #1024  
Tech Regular
Thread Starter
 
Join Date: Mar 2015
Posts: 311
Default

The waveform on TP8 seems quiteasymetrical, meaning that upper waveform is much higher than lower respect to zero. This can impair the zero crossing detection, but could also be caused by your probes.Please try to check voltage without signal (center waveform) and you might also want to investigate signal amplification. You might have too much input gain causing asymetrical clipping. If you can play with antenna gain. What I see is that waveform is quite 'slow' to get a good level after phase reversal. Compare the wave with the one you see in the wiki Decoder build instructions
mv4wd is offline  
Old 06-01-2024, 01:22 AM
  #1025  
Tech Rookie
 
Join Date: Apr 2024
Location: Lower Bavaria
Posts: 3
Default

Thank you for your help. Few days ago i was on racetrack with my eqipement.
Sadly we still got some problems.
I checked Voltage on TP8 without Transponder and the basline is looking very bad in my opinion. Very much peaks like you see in this picture:
h*ttps://ibb.co/b7VLKj4
h*ttps://ibb.co/PNbw0Fq
Playing with the Gain-Poti at MLA30+ makes it a little better wenn turning it down but then i have more problems to recognize Transponders.

What i did too when i built Transponders, i changed C5 from 68 to 120p because it gave me a better amplitude at a single loop-wire at oscilloskope, but a longer "Ring-up time" at the waveform, and this happens after phase shift too? Could this be a problem too?

Here is a photo when a car with Transponder stands near the loop:
h*ttps://ibb.co/gwKfyS6

And my Decoder:
h*ttps://ibb.co/jJZ97xg

Thank you!
Thomas@SBR is offline  
Old 06-02-2024, 05:53 AM
  #1026  
Tech Regular
Thread Starter
 
Join Date: Mar 2015
Posts: 311
Default

Two different things going on there. First, the bursts of noise might come from everywhere, and they seem quite powerful compared to the decoder signal. They might be real 'air' noise, they could be a noisy usb power, or they might be the pc or scope ungrounded power supply or ground loop. If you get that noise without the antenna connected (shorted) it's not from the air. Ttry to power just from battery. For the spikes in the transponder signal, those might come from a un-tuned loop. You will find in original 'Cano transpoder' thread the tuning relation with quick or slow phase reverse, and overshoots. It seems to me strange that you have overshooting in the normal sine part (without phase reverse). Can you just try and measure the transponder signal with just a loop of wire on the scope probe?
mv4wd is offline  
Old 06-02-2024, 10:40 PM
  #1027  
Tech Adept
 
kiwidave72's Avatar
 
Join Date: Apr 2010
Location: Gold Coast, Australia
Posts: 164
Default decoder , loop BOM

is anyone able to provide a BOM as a csv,xls file that i can then upload to digikey for ordering.

thanks
kiwidave72 is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.