I am interested in finding an existing project that uses a Arduino connected to the tachometer output from a two stroke CDI unit to operate a servo and turn off the choke.
This is a model aircraft application.
I start the engine with the choke on. It will start briefly and then flood slightly. If I could turn the choke off immediately it fired and ran at say, 250 RPM or so, it would continue to run.
Has something like this already been done?
Or, is there a RPM detector using arduino that partly does this function that I could modify the code to suit?
I am only a beginner with arduino.
PaulS:
There are projects using hall effect sensors, and other kinds of sensors, to measure RPM. You do not detect RPM.
That is an error of expression on my part: apologies.
What I mean is for a RPM sensor to measure RPM, as you say, then the arduino to process that and provide a trigger output pulse or voltage at a pre set threshold figure. ie: when the threshold figure is released, it triggers or switches an output.
That is why I mentioned, nominally, 250 RPM. (arbitrary, but would be less than 1000).
I've operate model aircraft engines and the like for the last 50 years or so and never found the need to choke more than the first rotation.
If you go with your original idea you will never get the engine to stop flooding.
Not much point in looking for a 250 or 1000 or anywhere in between rev count as I doubt the engine will ever get there, and once again , be flooded.
Even using a "count" method to turn the choke off after say 2 revolutions, by the time the servo gets to turn it off, you guessed it, engine flooded once again.
bluejets:
I've operate model aircraft engines and the like for the last 50 years or so and never found the need to choke more than the first rotation.
If you go with your original idea you will never get the engine to stop flooding.
Not much point in looking for a 250 or 1000 or anywhere in between rev count as I doubt the engine will ever get there, and once again , be flooded.
Even using a "count" method to turn the choke off after say 2 revolutions, by the time the servo gets to turn it off, you guessed it, engine flooded once again.
Ok, So possibly a no go idea.
No problem really to start the engine as it is.
Thanks,
I posted a question about this subject over on the rcgroups site.
It turns out that this choke control and much more is possible in the FrSky Taranis transmitter. I have just received mine in the mail and have yet to get into it.
This information renders my opening question even more redundant!
