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Old Aug 18, 2011, 08:27 PM
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rimshotcopter's Avatar
United States, CA, Los Angeles
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ESC RPM Senor

Hello everyone,

I would like to ask if someone knows of a good way to creating an senor that would connect to one or two wires coming from an ESC? The output from this sensor then would connected to an Arduino and the RPM calculated.

Thank you in advance.
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Old Aug 20, 2011, 06:03 AM
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Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
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Here's the rpm sensing circuit I used for my DIY Wattmeter.
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Old Aug 20, 2011, 08:19 AM
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Quote:
Originally Posted by Bruce Abbott View Post
Here's the rpm sensing circuit I used for my DIY Wattmeter.
Thank you so very Much.
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Old Aug 27, 2011, 03:46 PM
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pitlab's Avatar
Warsaw, Poland
Joined Oct 2004
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Some time ago I tried to build something similar, but had problems with counting PWM impulses instead phase turn on.
Maybe few pictures describe better the nature of the signal:

On the picture is one phase of the ESC. We can see current ramp up, turn on for about 4ms and next ramp down.

On closer look we can see series of impulses. Most probably the circuit described above will count the short PWM impuses instead total phast on.
I tried to filter the impulses, but the signal has wide range of frequency changes, so filter not worked well in all conditions.


More close view of the PWM impulse. Im my ESC it had frequency 7.8kHz.


Finally I builded optical RPM sensor. It works well in all conditions. Actually I use 2 sensors on my quadrocopter. It "looks" on the engines with glued black stickers on the half of circumference. Second half can be with white sticker, or like in my case is reflective metalic body of the engine.

Actually I use the sensors to compare parameters of the drives. For example test run with empty engine and engine with 10x4.5 propeller


Upper graph shows current (red) and voltage (blue), middle graph shows servo signal going to the both ESC. It is scaled in microseconds. Bottom graph shows RPM of the both engines measured with my sensors.
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Old Aug 27, 2011, 05:13 PM
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Thank you, the IR senor may just be the better Mouse Trap.
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Old Aug 28, 2011, 03:37 AM
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Germany, HB, Bremen
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Have a look in this thread for a simple IR solution http://www.rcgroups.com/forums/showthread.php?t=1450032
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Old Aug 28, 2011, 08:10 AM
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Quote:
Originally Posted by Zen09 View Post
Have a look in this thread for a simple IR solution http://www.rcgroups.com/forums/showthread.php?t=1450032

Thank you.
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Old Dec 13, 2012, 07:58 PM
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United States, GA, Fort Valley
Joined Aug 2007
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Hi do you know of any senored input ESC 's 25A to 40A using hall effect sensors on outrunner motor?
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