Host Engineering Forum
General Category => Do-more CPUs and Do-more Designer Software => Topic started by: unsyndicated on July 06, 2021, 09:17:38 AM
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Apologies if its been discussed before. I've tried searching but with no luck.
I have msd 7al3 ignition box, I'm attempting to see if I can output its tach signal to a BRX high speed input. The 7al3 outputs 12vdc square wave signal. Would the BRX be able to capture the signal?
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BRX inputs should work down to 9v and speed is likely be plenty fast an ignition. The BX-HSIO4 module has differential inputs that work down to TTL levels and is even faster.
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Perfect we'll be spinning at 10k rpms and wanted to see if I could build my own digital display and data logger.
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Perfect we'll be spinning at 10k rpms and wanted to see if I could build my own digital display and data logger.
Easy. 10K RPM is only 166Hz, nothing at all. For something that slow, you may want to use a timer with interval scaling.
Fun fact: Host did some telemetry for ADC's TransAm car many years back. I was trying to get good numbers from a wheel speed sensor and was struggling with the high speed counter being too slow and crunchy to provide good rate numbers. So rather than counting rotations, I switched over to timing them. That was the inspiration for the Free Run Edge Timer w/Interval Scaling that got added to the CTRIO, and then eventually to BRX.
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sounds like you have given me another idea, might just have to put a sensor to measure wheel speed. Now to figure out air/fuel ratio logging.
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sounds like you have given me another idea, might just have to put a sensor to measure wheel speed. Now to figure out air/fuel ratio logging.
Good luck!