Hi all,
Has anyone had any experience using an inductive speed pickup (2 wire) as an input to a Particle Electron? Is the signal strong enough to go straight into an interrupt pin, or is some type of amplificaiton required?
Thanks!
Hi all,
Has anyone had any experience using an inductive speed pickup (2 wire) as an input to a Particle Electron? Is the signal strong enough to go straight into an interrupt pin, or is some type of amplificaiton required?
Thanks!
Hi Stoo,
Not 100% what kind of sensor you’re referring to, do you have a link?
Hi Sam,
not sure exactly what the sensors are yet, but something like this http://au.rs-online.com/web/p/magnetic-pickups/0304166/
One of them is counting teeth in a gear box (I think it is 50 teeth/revolution @ up to 750 rpm), with only two wires on the sensor, and the other is also just a two wire sensor on a fan, which I think is one pulse/rev @ up to 1400 rpm.
Thanks Stoo. Looks like that sensor outputs up to 10V peak to peak. If indeed 10V pk-pk then it will certainly damage your Particle Electron without a voltage step down in place (basic resistor voltage divider would suffice) along with something to protect from negative voltages (the -10V could be isolated with a fly back diode).
Perhaps in the code include a small delay after a rising / falling edges are detected, to avoid false hits triggered by noise / etc. Would be easiest to checkout the signal on a scope - that way you could make an educated guess with what delay would suit.
If the Vnoise is < 200mV then no need as Particle Electron I/O pins have schmitt triggers which should keep clean reads.