palouseflyer
Newbie level 1
remote tachometer
I am looking for some ideas for a small remote wireless tachometer.
The application would be for an remote controlled helicopter, where the RPM of the main baldes could be measured and transmitted remotely.
One basic idea is to mount a small magnet to the fan of the heli - this fan rotates at a known ratio to the main blades. Then mount a small coil close to this magnet location, and feed that pulse to a small transmitter somehow... the received signal would then be perhaps amplified and fed into a multimeter that measures frequency. I realize this is quite sketchy, perhaps there are alternative ways to accomplish the same results. Bottom line, it has to be CHEAP to build!
thanks
I am looking for some ideas for a small remote wireless tachometer.
The application would be for an remote controlled helicopter, where the RPM of the main baldes could be measured and transmitted remotely.
One basic idea is to mount a small magnet to the fan of the heli - this fan rotates at a known ratio to the main blades. Then mount a small coil close to this magnet location, and feed that pulse to a small transmitter somehow... the received signal would then be perhaps amplified and fed into a multimeter that measures frequency. I realize this is quite sketchy, perhaps there are alternative ways to accomplish the same results. Bottom line, it has to be CHEAP to build!
thanks
