Mario Schneiderbanger Posted July 20, 2019 Report Share Posted July 20, 2019 I dont think I can use DI1-8 for an ap1 s2000 speed input since the frequency is much higher than that of other sensors. Here is a chart i found. At very low speed it works fine but anything faster than 20 mph the reading goes erratic reading as high as 1500mph at times. Any suggestions? I already tried to switch from rising to falling. I have not tried the pullup resistor since it does read speed. EDIT: I just checked the runtime values on DI3 and it reads up to 1600hz reliably before it starts to drop out. Unfortunately 1600hz is only 34ish mph which coincides with the chart below. VSS Signal: speed(MPH) S2000(hrtz) Integra(Hrtz) 0 0-100 0 010 500 15 20 940 26 30 1340 38 40 1800 48 50 2230 59 60 2640 70 70 3090 80 80 3500 91 90 3910 101 100 4310 112110 4810 123120 5240 134 Quote Link to comment Share on other sites More sharing options...
Richard Hill Posted July 20, 2019 Report Share Posted July 20, 2019 What ecu are you using? if its a thunder then yes the differential digital inputs are fine to use with high speed inputs. All other ecus are restricted to lower speeds, so a divider circuit would need to be used. Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 20, 2019 Author Report Share Posted July 20, 2019 Thanks Rich, i realized after asking about DI11+ that my Fury doesn't have them. Any idea where I might find a divider circuit that I can configure to divide by 39? Edit: It only needs to divide by 6 or 8 to get the full resolution Quote Link to comment Share on other sites More sharing options...
cj Posted July 22, 2019 Report Share Posted July 22, 2019 You can build one using these chips for a few $ https://www.jaycar.co.nz/4024-7-stage-ripple-carry-counter-divider-cmos-ic/p/ZC4024 Depending on which output you take the signal from it will divide by 2/4/8/16/32/64/128 I've used these in the past to adapt high frequency gearbox outputs down to something that can be fed to a DI at lower frequency and they have worked fine. Only thing to check is whether you need a pullup on the input & output circuits - input you need to add a pullup resistor to 5v or 12v, output side (ECU input side) you do in the ECU config for the DI. Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 22, 2019 Author Report Share Posted July 22, 2019 my circuit building knowledge is very slim. can i feed 12 into the VDD (14) or must i feed it 5v? ground goes to VSS(7) My sensor signal goes to pin (1) and my output i’ll have to try Q3(9) i’m also not quite sure how to calculate the pull-up resistor value for the VDD side Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 22, 2019 Report Share Posted July 22, 2019 Q3 gives you a divide by 8, Q4 is divide by 16. Mario Schneiderbanger 1 Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 22, 2019 Author Report Share Posted July 22, 2019 thx adam! Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 24, 2019 Author Report Share Posted July 24, 2019 Gonna give this guy a go Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 26, 2019 Author Report Share Posted July 26, 2019 Were in business! Quote Link to comment Share on other sites More sharing options...
1320MINI Posted July 29, 2019 Report Share Posted July 29, 2019 Adam, It worked for me also, Mario Schneiderbanger 1 Quote Link to comment Share on other sites More sharing options...
Mario Schneiderbanger Posted July 30, 2019 Author Report Share Posted July 30, 2019 Can’t say enough good things about Link tech support! Quote Link to comment Share on other sites More sharing options...
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