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Issue... using VR to HALL adapter
It's the second [vr-to-hall adapter] that I'm receiving and cannot get it to work, I own a Toyota corolla 99 model equipped with ABS of course, so ordered this to make use of the sensors as wheels speed source to feed my link ecu digital input.
- Measure the DC "mean" voltage of the signal (with DVM, ignition on) WRITE THE RESULT HERE
- measure the AC voltage of the signal (with DVM, roadspeed > 5km/h get someone to help, take care). WRITE THE RESULT HERE
- Notice that even the most basic measurements (above) are not done, or not written here, If instructions are simply neglected, it is impossible to help.
- Does the signal go negative ? (important for LM1815)
- if measured AC > 0.9*DC than most likely the signal goes negative. If AC > DC than certainly the signal goes negative.
- can be verified with scope, of course (recommended)
I've wired
- +5v
- GND
- signal out to ecu using the /8 from the one side
- connect reset to GND, please
'''this was the mistake!!!! Finally everything is working, I wish I ve tried it from the first converter but I was told in link ecu forum not to connect it!! After lots of reading every divider/counter circuit had it connected and that was the whole deal!
Thanks!'''
*Sometimes abs check light is coming on but if I turn off and on the engine it goes off again, maybe some diodes or resistors to try somewhere??
- maybe, start with the above. Notice that even the most basic measurements (above) are not done, or not written there, If instructions are simply neglected, it is impossible to help.
and vr+ and vr- from the other side.
Have I done something wrong? Difficult to know without seeing the exact pins. Please care to write pin numbers.
- I need to connect the Reset counter pin to GND?
- yes
Results are when and if the converter is working, it's working just fine, with the /8 I needed a little adjustment in the link ecu settings and voila my speed was there. After my first 2-3km driving around, it stopped. So you say I guess wiring issue..but same time once it's working and next moment it's not. Even tried a 2nd sensor, same results, even ordered a 2nd adapter again same results.
- On the 2nd order received there were 3 triplets of resistors, 470, 2k7 and 4.7 if I remember correctly,so where shall I test/install these?
- See GenBoard/VrInputWithHallSensor (this was sent in private message, please carefully read the messages sent to you. Unfortunately the "question" in the first 5 email requests did NOT include any useful information about the environment, so it is most likely NOT applicable if -8V is not available easily in the actual environment.)
Two hints: One is if while driving around and no sign of the converter working I touch it with my hands and pushing it, it starts showing speed just fine, this was happening with both the converters.
Can you resolder/reheat the soldering on the PCB (not many pins, luckily), just in case ?
- it is either voltage bias/threshold problem, or contact / soldering problem, but impossible to know because we don't see your basic voltage measurements (related to the setup).
Second is if I let it "rest" for a while, then the first time spinning the wheel even by hand having the car on a jack, is always successful, BUT not the second one.
Again PLEASE don't start asking me about the wiring, I've tested it with a MAX9926 circuit and working just fine every time, using it two days in a row not a single problem anywhere. I need the VEMS one and ordered it for it's divby steps because my ecu can handle up to 500hz signal and MAX circuit which doesn't offer divby options has already 1000hz at 70kph. If someone can point me how to use only the 4024 part of the VEMS, it's fine for me although the MAX one is a bulk pcb, so I keep on struggling to make the vems one working ok, having it in its connectors-casings!
Ive also tried to set it to the most sensitive mode with the solderblob on the first two points with the >=150mv threshold, no luck too.
- again, see the measurements above
- I can't figure out what more to try
- read again, carefully
Can you please help to get to the bottom of it as it drives me crazy? How is it possible to "squeeze" something by hand and have it working great like this until you leave it? Is there something wrong with the ground?
One more hint (maybe) : If I add a 4024 ic after my max9926, I get no signal too no matter what /x I choose to use or at what speed I drive!
- The 1:1 output on the vems VR-HALL adapter is directly from the lm1815 just to give it a try tomorrow?
- Yes, short pulse.
- Too bad you forgot to detail your setup in the first 2 orders and 5+ mails, we could have sent you HC4024 PCB for your experiments (without LM1815) for no extra charge. But "detaching" LM1815 output (cutting trace) so HC4024 clock is fed from external signal is easy.
What does anyone need to measure so as to help?
See top of the page: The DC mean voltage, and the min/max voltages