Instructables

Remote control Sensor?

Hey I am doing A2 level engineering at college and for my coursework i have upgraded my last years project which is a remote control hovercraft i have upgraded my motors and layout etc etc but we require more electronics this year. i an wanting to know how i could possibly mount 2 sensors at the front so that i can make the hovercraft run by itself and if it approaches an object it turns away from it. i would like that to be a sub system itself so i can turn it on and off for when i want to use the remote control. how can i do this? thanks

yaymatyos1 year ago
wow i like it
Here are some ways you could do this:
1) Use Physical Sensors
Put little metal prongs in the front of whatever you are using and make it so when something hits the prongs, the prongs will touch a connection. This is pretty much the same way some of those 'Hex Bugs' work.

2) Light Sensors
I'm not sure how to do this but you could do some research. I've gone to the Springfield Museum in Massachusetts and they had a robotics exhibit and they had a NXT Lego Robot that would turn around when it reached a black line or the edge of the table. Look into this.

3)Distance Sensors
There are sensors that can plug into an Arduino board that sense when something is close, here is an example of this in use: http://www.instructables.com/id/RC-Car-to-Robot/ (notice the sensors in the front of the car)
The Burn Crew (author) 7 years ago
if i was to use the first one how would i implement it, as the turning is on a servo and needs left and right controls. i was thinking a sensor on either side of the hovercraft,
It would prob have to be at least two sensors going into a control circuit of some kind. Usually its a PIC controller or something to evaluate the condition of the two sensors. It can then tell the servo which way to go.

This PDF seems to have plenty of ideas for interfacing:
http://info.hobbyengineering.com/specs/devantech-srf04-tech.pdf
photozz7 years ago
Well there are two ways I can see that would be relatively easy to implement. One would be an ultrasonic setup. this is prob the most accurate in terms of gaging distance.
Something like this:
http://www.circuitcellar.com/library/print/0103/piana150/index.htm

The other option would be an infra-red setup with an emitter and detector. This would be easier to implement, but would be less accurate, and could possibly be fooled if there are any ambient sources of light nearby.
Like this:
http://www.societyofrobots.com/sensors_sharpirrange.shtml