74*14-based photopopper circuits - 0 views
library.solarbotics.net/...bot_popper_14.html
5star 74x14 beam circuit electronics maxibug photopopper phototrope robot
shared by York Jong on 27 May 07
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Droidmakr (Cliff Boerema) came up with an interesting idea for a light-tracking head with a form of peripheral vision. As often happens, the circuit turned into something different -- a photopopper:
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I tried the same setup with the 74*240 (with an extra inverter per motor) and 7404, but the 74HC14 seems to work best.
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John-Isaac Mumford started off by simplifying the Maxibug design, and wound up with an entirely new circuit -- Mazibug
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The tactiles switches behave even more strongly: if a switch is closed then the bot turns away unconditionally. If both switches are closed the robots reverse straight back regardless of light level.
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When the robot bumps into something on one side, it over-rides all the photodiode circuits and reverses the motor on the OPPOSITE side
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From the title it would appear that all 4 photodiodes face forward but the 2 inner PDs face directly forward and the outer 2 are angled to the left and right
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