robot

Bob's second outing

Posted Fri, 21/11/2008 - 04:49 by peteh
IMG_3259

Bob has had a bit of minor surgery. I replaced the Darlington transistor motor driver with a L293D chip. Thing is, I forgot that the 293 has relatively large losses so Bob was much slower...

Line Follower First run

Posted Mon, 17/11/2008 - 05:51 by peteh

IMG_3259 All the bits are together and the processor code tested. Bob should know when he is on track and how far out he is when he is off track. Time to get him running on the test track...

Line Follower Sensors Setup

Posted Sun, 16/11/2008 - 21:17 by peteh

IMG_3258With the sensors installed and the robot pretty well complete, it is time to see if they can actually do the job they were designed for. the idea is that the line of sensors will be able to measure the robots offset from the centre of the line over as wide a range as possible.

Line Follower Test Track

Posted Sun, 16/11/2008 - 20:22 by peteh

IMG_3257 You can't build a line follower without a test track to run it on. The proposed UK rules for this competition specify the track to be on a 300mm grid with fixed turn radii of 150mm. Well, I don't have room for that and I don't want to make tiles either so a little lateral thinking is called for...

Line follower sensor experiments

Posted Tue, 11/11/2008 - 04:58 by peteh

IMG_3237 The simplest arrangement for a line follower is probably two sensors with digital outputs. As long as one can see the line and the other can see the background, the controller is happy otherwise it must turn left or right as appropriate. I was after something a bit more sophisticated for Bob the Line follower...