Hardy Maxa
  • Crib Point,VIC
  • Australia

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Problem using the PPM encoder as RPM sensor on Nitro Heli

Started this discussion. Last reply by Hardy Maxa Feb 16, 2011. 1 Reply

HI All. I've been going through the PPM Encoder software, and its taking some time to understand it enough to answer this question. I have connected an RPM sensor (IR Opto through a hole in the main…Continue

Tags: sensor, RPM, encoder, PPM


Hardy Maxa's Page

Profile Information

About Me:
Model aircraft pilot and electronics engineer for 20+ years. First autopilot about 15 years ago. Now building with Ardupilot-Mega
Please tell us a bit about your UAV interest
Want to turn the Ardupilot-Mega into a model aircraft training/safety system.

Hardy Maxa's Blog

The PPM Saga continues

Posted on February 24, 2011 at 6:00am 3 Comments

Following on from my PPM Encoder mods (PPM Encoder Updated), I needed to…


PPM Encoder MUX Switch modifications

Posted on February 19, 2011 at 4:00pm 1 Comment

After my RPM sensor additions to the PPM Encoder, it seems my MUX switch for enabling/disabling the Autopilot is not working.  Some testing with a proportional channel (Throttle) revealed the MUX channel mid value to be about 2800, which is where I have set the RC_MUX_MAX now.  The previous value of 1250 was too low for… Continue

PPM Encoder updated.

Posted on February 16, 2011 at 6:00am 6 Comments

So today, I have got the updated PPM encoder s/ware working to do RPM measurement on one input channel.



For an RPM range of about 300 - 2000, the output pulse to the AP CPU is ranging from 2mS to 0.5mS.  The ACM code might need modding to accept this, without thinking its a sync pulse, but thats the next task.  All this will need further calibration when I test it with the motor running.


The RPM sensor is an IR LED and IR photodiode,…


My Entry into the ArduPilot Mega game.

Posted on January 15, 2011 at 3:00am 0 Comments

Many years ago, I tried building a model heli autopilot out of some old mouse position sensors, an 8031 micro, and my Hirobo shuttle.  The whole thing seemed to work on the bench, but quickly broke a few blades when I slammed the throttle on for an air test.  Such is life.


Now - its happening all over again, but this time, due to the excellent work done by the Ardupilot teams, I expect much better results.


So I got my APM for xmas, and its taken a month of…


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