 | | Re: Battery level monitoring?
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(...) For anyone else interested, I came across a description by Fred of a modification to the Miniboard that describes how to cut a track on the board to allow analog battery level monitoring. Unfortunately, the picture is missing from the page: (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | Sonar sensitivity to 'Curtains'
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I gave my Polaroid Sonar the curtain test and it passed. Someone suggested that Sonar could not see curtains. Not only does it see curtains, it also sees a towel, a handkerchief, a kleenex, and, get this, a piece of free hanging string. My bot is (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | RE: h-bridges, current info
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The answer is yes, but it isn't as useful. BJTs (Bipolar Junction Transistors) are current based devices, if you look at the 'base' input to the transistor as a pipe, for NPN devices there needs to be current flowing "into" the base for them to turn (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: High current motors
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Jeff is correct, after looking at the schematics for the motor driver my circuit won't work. You will have to wire two sides of the motor driver output to the 2907's with back to back diodes. I'll draw up a schematic and post it. (In my original (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) The IR sensors on the robot I built have an effective range of about 4 feet. The "downside" of IR sensors are that they are much more difficult to scale in terms of distance. I used a PIC chip to do both illumination and error elimination and (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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