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HArd power off switch

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jakaranda
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Joined: 2018-10-27 23:28
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HArd power off switch

Hello,

I am building an electric surfboard using the vesc6 controller.

I am looking for a simple solution to have the power shut off when I fall off. The idea being to minimize the likelihood that I get sliced by the propeller when I fall in. 

I was thinking of having a switch on the input power from the batteries. 

I am worried though that a sudden input power shut off may damage the vesc or parts downstream?

 

Would that be the case, any recommendations?

 

Thank you

 

JB

Pedrodemio
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Joined: 2017-08-02 00:38
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The best way to do this is via software, once the fall is detected the VESC will apply full brake, since the propeller+motor have a low inertia I bet that with a acceptable brake current it would stop in less than a second

odeston5@gmail.com
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Joined: 2017-10-11 12:31
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Probably, you can use magnet tied to the foot with a rope and reed switch on your board. When magnet is removed - reed switch turns off.

sam.vanratt
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Joined: 2018-11-18 14:09
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Hi jakaranda

I'd go for a pressure sensor on the downside of your board. As soon as the pressure is released (you dropped off, the board flipped) then the pressure of water=sensor will change and you trigger the brake function build into the VESC. The magnet/reed contact sound a bit crude as you will surely move your feet around. Another way would be to use an 2D/3D acceleration sensor (like those build into smartphones) which detects fast movements and falls.

Cheers

Sam

Pedelec usage in combination with a GoldenMotor MagicPie3 BLDC