Paul Lee
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Analog float switch to Pixhawk aux ports

Started this discussion. Last reply by John Fitter Aug 31. 3 Replies

Hello people!I am planning to build a UAV sprayer system that will trigger an RTL if the the liquid inside the tank reach a certain level. My idea is to install a float switch inside the tank and…Continue

 

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John Fitter replied to Paul Lee's discussion Analog float switch to Pixhawk aux ports
"Paul, the problem with measuring tank contents in an aircraft is that the fluid is subject to forces outside of the aircraft's inertial frame of reference. Put simply, the fluid sloshes around. Full size aircraft face this problem. Float…"
Aug 31
Crady von Pawlak replied to Paul Lee's discussion Analog float switch to Pixhawk aux ports
"Hi Paul.  Chris definitely has the right idea. A float would be unnecessarily heavy and complex - especially if you simply want to know when the tank is empty.  Back in the day I designed a meniscus sensor for an automated pipettor that…"
Apr 11

3D Robotics
Chris Anderson replied to Paul Lee's discussion Analog float switch to Pixhawk aux ports
"Crop sprayer support is already built in: http://ardupilot.org/copter/docs/sprayer.html As for the switch you describe, there are lots of problems with your proposed method: 1) Switches typically don't produce PWM. They're digital…"
Apr 11
Paul Lee posted a discussion

Analog float switch to Pixhawk aux ports

Hello people!I am planning to build a UAV sprayer system that will trigger an RTL if the the liquid inside the tank reach a certain level. My idea is to install a float switch inside the tank and maybe hook up the connection to one of the aux ports of the Pixhawk. And have the FC read the pwm values of the switch with out using a companion computer.Unfortunately, I could not find the answer despite scouring the internet and wiki for information. Is this something you guys have come across with?…See More
Apr 10
Paul Lee replied to Bill Elias's discussion UAV sprayer for agriculture
Apr 9
Paul Lee replied to Bill Elias's discussion UAV sprayer for agriculture
"hi Brian. excellent build you got there bro. just one question, how do you know if the tank is empty?"
Apr 5

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drone maker
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multicopter enthutiast
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Brisbane

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