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scoobe dog |
lap timmer question's |
Lead | |
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Ok, I got an old computer for this. Now, what do I need for this? LOL! What software? What parts? Thanks!
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frank9129 |
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Scoobe,
Crab Alley Speedway
GIT-R-DONE |
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scoobe dog |
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LOL! Thats what I need, lap timmers for dummies!
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farmnurd |
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I used ultimate racer to time the sprint race. It's a free program at uracerweb.org. My hardware needs were two 33 ohm resistors, two ir emitters, two
phototransistors and a 25 pin d ring serial communication cable. Total cost under $20. If you would like the radio shack parts numbers PM me.
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moparjenny |
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pfuetze |
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i´m using laptimer2000, easy to use, nothing fancy about, follows the KISS principe
here is philippe´s article for lap timing: http://homepage.mac.com/pmarchand/lapcounter.htm in the cool tools thread, you can find the part numbers for the needed parts (2 resistors, 2 IR emitters, 2 IR receivers, 1 old parallel port (printer) cable). done. need more info? just let me know! puddle dude
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Isaac McLove |
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I'm using Ultimate Racer and these things...Here's a pic of the phototransistors from Radio Shack. I wired these to a DB25 printer cable. Please let
me know if I can help out. Installing the computer system has really enhanced our enjoyment of the track!
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MOTS |
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Youz guys can search the site. Peter has the wiring diagrams. Or you can PM me and I'll explain exactly what you need to do in englais, por favor! Step by
step. Does anyone
else's emitters get hotter than a two dollar pistol? |
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Nor Cal Mike |
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I am somewhat of a computer dummy so when I read about pin #37 of the printer port or #19 of the game port, my mind goes blank and scratch building a system
goes out the window. I took the easy way out and bought a Trackmate system with easy to hook up wires and complete directions. I chose the dead strip method
and it works flawlessly. I just started dabbling in 1/43 so I haven't used it on a 1/43 track but Trackmate counts my SCX compact cars just find on my 1/32
woody.
Mike A |
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farmnurd |
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I didn't want to have to have an external power supply to run a light tower so first I tried a sub micro lever arm switch as my trigger. It worked for cars
with guide flags at all speeds and ones with pins if you went slow but it didn't see every lap if the car was going fast.
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So I scrapped that approach and tried the light tower approach with a 5v wallwart for power.
This works but can I get my 5v from from one of the outputs from my computer through the serial communications cable? I want to eliminate the need for an external power supply for my ir emitters. Seems like it should but I'm no expert and don't want to smoke my computer
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Barfly101 |
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MOTS wrote:That's a two "barrel" pistol LOL |
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ffries61 |
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What kind of computer are you using?, I'm using the power supply to run my emitters on my system (ATX) style PC. You should be able to get 5V from an old
AT power supply also.
Fred |
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farmnurd |
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I am using a Compac Presario 2100 laptop. What I am wondering is, on ultimate racer pin 2 is an output for power control. I know it puts out 5v when enabled so
it can turn on an external relay that puts track voltage to your track. If I don't use the power control option can I use this 5v to power my light tower
and eliminate my external power supply?
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pfuetze |
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Farmy, i strongly recommend an external power supply for the timing, i learned this leason the hard way!
Wrong counts, additional counts, no counts, everything you can imagine. If anyone need any information, just let me know, i´ll try help. I´ll try to make a photo of pin 10 of parallel port to explain this as well. Peter |
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scoobe dog |
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I need all the help I can get!
Part #'s, how to's, where
to's.
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farmnurd |
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Scoobe check your PM.
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pfuetze |
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copied from the cool tools sticky thread (page 2):
as some of us are up to building computer based a lap timer here is a part list and some tipps. here are the parts that you would need for a timing system: - 2 pcs. IR emitter SFH485 - Digi-Key Part Number 475-1469-ND - 2 pcs. resistor 30 ohm 1W Digi-Key Part Number BC30W-1CT-ND - 2 pcs. IR receiver SFH 309 FA - Digi-Key Part Number 475-1440-ND - 1 power supply (wall wart) with something around 5V and 200mA you can use an artin wallwart as well. if you use a 7.5V@800mA artin wall wart it would be better to use this resistor 1W 47 ohm digikey part number PPC47W-1CT-ND - 1 parallel port printer cable (to connect the receivers) i would place the emitters under the track and the receivers above the track in a bridge or something like that. be sure to align the emitters and receivers really well, otherwise it will not work. the maximum distance between emitters and receivers is something around 2" to 3" (depending on powersupply) If you can measure the current to the emitters, it should be between 70 and 100mA to each emitter. 100mA is the max.rating for the emitters! here is a wiring diagramm, done by Gregory Braun, for Laptimer2000.
and here is the wiring of the emitters:
this is how it looks on the track: active lightbridge The hardware should work for all kinds of race software, i prefer laptimer2000, but it should work with UltimateRacer3.0 as well, even with SlotmanLight (but this is a german only programm). did i miss anything? Peter |
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farmnurd |
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Spent the day inside in the air and after looking at some Ultimate Racer help sites saw that the outputs could be used to run LEDs and/or relays. So why not
run a ir LED emitter and eliminate the external power supply? I enabled pins 2 and 3 to power my emitters (with 33 ohm resistors)and they use pin 25 as common
same as my photo-resistors. Power is at 4.6v and is only on when you are in the race menu and until you access another menu. I was able to make it to work out
to 2 1/2 inches apart on these test boards with my laptop. It may go further but I was too lazy to move stuff around. This unit will go out in beta form to
blancboys track and computer and we will report later on it's performance.
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