Can the kill switch be programmed?

Technical questions about electronics and sensors

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sheridak
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Can the kill switch be programmed?

Post by sheridak » Sat Jan 20, 2018 2:10 pm

Our plan was to use a dedicated microcontroller responsible for sending motor commands to the ESCs while listening to both our flight controller's motor commands and a PWM signal coming from our receiver. If the receiver reports that a switch has been flipped on our RC controller the microcontroller sends throttle off commands to the ESCs and ignores any requests from the flight controller.

Is this ok? Does the kill switch need to kill power to the ESCs or could it just command them to stop the motors?

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Re: Can the kill switch be programmed?

Post by IARCadmin » Wed Jan 24, 2018 12:00 pm

There have been teams in the past that have done this in one way or another. Basically, as long as the "stand alone" requirement is satisfied (that is the kill switch can operate without the main CPU/flight computer running), and that it's source of power is directly linked to the the main power source on the vehicle, it will be fine. It sounds like you are just replacing the TTL logic chip solution with a microcontroller.
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rmisra
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Re: Can the kill switch be programmed?

Post by rmisra » Thu Feb 01, 2018 10:59 pm

We have developed a kill switch that directly cuts off current to the ESC's, if you are interested. It uses CMOS logic and has been proved to work, and we used it when we competed in August.

https://github.com/Pitt-RAS/IARC-2016-2 ... ety-Switch

We have also developed a new version that has slightly improved logic/support for a higher current draw. We are in the process of ordering it, so we don't know for sure if it works yet.

https://github.com/Pitt-RAS/EKill-v2

sheridak
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Re: Can the kill switch be programmed?

Post by sheridak » Mon Feb 05, 2018 10:04 am

Okay, great. Thank you both for the info! Sorry for my late reply I did not receive a notification about your replies.

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