Testing trailer brake controller....
Been working on this for days. I'm about ready to start screaming. (FYI, I am not in a good mood and any trolls looking to unload shaming or sarcasm or just generally embark on some kind of self-serv...
Forum Discussion
Gene&Ginny wrote:cannesdo wrote:You are correct, not funny.
...
See this....Not so funny:
https://www.quora.com/How-does-the-compass-on-the-iPhone-work
https://www.quora.com/How-does-the-compass-on-the-iPhone-work
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My thinking is that the Hall effect sensor in the iPhone would not respond to an electrically generated magnetic field the same way a simple compas needle would ..... but I may be wrong. I would like to know if someone has tried it.
Keep in mind that most brake controllers will not put out voltage to the brakes if the vehicle not moving. They WILL put out voltage by moving the manual slider.
The hall effect sensors simply detect magnetic fields. you'd be surprised what you can do with a modern cell phone. The compasses are even sensitive enough to use to detect current through DC wires when you hold it close to the wire and switch things on and off you'll see the compass jump if the wire is carrying any significant current. This doesn't work right it the ground wire parallels the power wire though as the magnetic fields cancel each other out. You can also use the camera on your cell phone to check and see if the infrared remote control for you Television works. The infrared shows up as visible light in the camera display.
