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

Latest Activity

Hardy Maxa commented on Roberto Navoni's blog post The Better Computer for our Advanced 3D Ground station .
"Here's a trip down memory lane. System 80 (aka Genie / TRS80) with extra 32K ram chips piggy backed, and a Z80A upgrade from the Z80 --> Amstrad 6128 --> IBM XT (orig) --> 80286 (NEAT chipset) etc.. With some hardcore Z80, I recon the…"
Apr 12, 2011
Hardy Maxa replied to Allen Burch's discussion Ardupilot and Nitro Heli's
"Hi Allen.  I'd be very interested in hearing your opinions on vibration damping.  I haven't tackled mounting the APM into my heli yet, most of my work has been modifying the PPM encoder to sense the rotor RPM. So I now have the…"
Apr 12, 2011
Hardy Maxa commented on Hardy Maxa's blog post The PPM Saga continues
"Well Darren, Jack - I'll take your comments as compliments.  Esp when you see the age of the rest of my collection.  I think my milling machine was made in about 1920.   But aside from this, I have recoded the RPM timers from…"
Feb 28, 2011
Hardy Maxa posted blog posts
Feb 25, 2011
Darren commented on Hardy Maxa's blog post The PPM Saga continues
"too funny, that was my first impression too... I had a mac that looked so much like it, I had to look twice. :)"
Feb 24, 2011
Jack Crossfire commented on Hardy Maxa's blog post The PPM Saga continues
"That looks like an original Mac converted into an oscilloscope & that looks like a living breathing CRT monitor.  It's like 1999.    "
Feb 24, 2011
Gudrex commented on Hardy Maxa's blog post PPM Encoder MUX Switch modifications
"Intetesting. BTW.. Enjoyed seeing your JR Ergo's. I love mine."
Feb 19, 2011
Hardy Maxa posted a blog post

PPM Encoder MUX Switch modifications

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 detection.  Not sure…See More
Feb 19, 2011
Hardy Maxa commented on Hardy Maxa's blog post PPM Encoder updated.
"What - microphone or RPM sensor ?  The microphone I guess could sense engine RPM if the signal was processed right.  The RPM sensor I need to keep the engine / rotor running at constant revs.  With collective pitch, you want your lift…"
Feb 17, 2011
Eric commented on Hardy Maxa's blog post PPM Encoder updated.
"What would this be used for?"
Feb 16, 2011
Ersin Acar commented on Hardy Maxa's blog post PPM Encoder updated.
"belive me microphone sux. about magnet. you need very sensetive hall effect sensor. to manage it. event motor will effect result. you need lots of test but when you are done its better then optic sensors for me."
Feb 16, 2011
Hardy Maxa commented on Hardy Maxa's blog post PPM Encoder updated.
"Yeah - thanks guys.  I tried a hall effect sensor I had in my collection, which was from an old tape drive motor, but it had some circuit inside and was setup for a specific magnetic field strength.  I had the sensor mounted next to the…"
Feb 16, 2011

Moderator
John Church commented on Hardy Maxa's blog post PPM Encoder updated.
"Very nice work. Good call on hall effect sensor Ersin. I'd go for a tiny magnet embedded on the main gear over drilling my main mast- ingenious none the less, Hardy. ;)  I like the compact nature of your hardware mod- I could see myself…"
Feb 16, 2011
Ersin Acar commented on Hardy Maxa's blog post PPM Encoder updated.
"We used same method on volkswagen T2(1972) minibus' engine. but in dirty places hall effect sensor & magnet rox. you should try it too :)"
Feb 16, 2011
Hardy Maxa posted a blog post

PPM Encoder updated.

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, glued into holes drilled into the frame either side of the…See More
Feb 16, 2011
Hardy Maxa replied to Hardy Maxa's discussion Problem using the PPM encoder as RPM sensor on Nitro Heli
"Wrong forum maybe ?   Anyway - Code is mod'd now.  Refer to my blog."
Feb 16, 2011

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 UAS 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…

Continue

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,…

Continue

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…

Continue

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