http://robots.net/person/johndavid400/ robots.net blog for johndavid400 en-us mod_virgule Mon, 13 Feb 2012 07:36:53 GMT Mon, 21 Dec 2009 22:15:51 GMT http://robots.net/person/johndavid400/diary.html?start=0 http://robots.net/person/johndavid400/diary.html?start=0 Hello all, <p> I am new to this site and thought I would share an R/C Lawn-mower project I just finished. I know this is not a new idea, but it was a very helpful learning experience for me, as well as being extremely useful. <p> I used an Atmega168 microcontroller and came up with the code to translate 2 r/c servo signals into forward/reverse PWM values. Then I designed and built a dual H-bridge to use as the speed controller for the bot. I also added a 2nd Atmega168 to separately decode a 3rd servo signal connected to a toggle switch, which I use as a failsafe and remote shut-off switch, disconnecting all power to the motors in case of a problem or signal loss. <p> The power comes from 2 wheelchair motors using #25 chain to transmit power to the rear wheels. It uses 2 deep-cycle marine batteries for optimum run-time. <p> For more information, check out <a href="http://rediculouslygoodlooking.com/" >my website</a>. I have most of my projects listed there. <p> Here is a video of the Lawnbot400 in action: <p> <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/lpMazvf-R98&hl=en_US&fs=1&"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/lpMazvf-R98&hl=en_US&fs=1&" type="application/x-shockwave-flash" width="425" height="344"></embed></object>