Let's Make Robots!

74 logic brain improvement suggestions

i made this on breadboard and it appears to work.

but before i start soldering im wondering if i missed anything, if anything can be done better etc.
being the noob that i am i'm sure i overlooked stuff...

 

truth:

A B C - W X Y Z

1 1 0 -   0 1 1 0 forward
0 1 0 -   0 0 0 T turn left
1 0 0 -   1 0 0 0 turn right
1 1 1 -   1 0 0 T reverse
0 1 1 -   1 0 0 T reverse
0 0 0 -   1 0 0 T reverse
0 0 1 -   1 0 0 T reverse


(C = normally off, A+B = normally on, T = timed pulse)

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they are AND gates and the 555 is for making a timed pulse on one of the reverse outputs so it turns
when it backs up from obstacles or both sensors are over black.

thats the theory, though there is 1 problem in that if it strays off the line, it won't find its way back.

i think i'm just gonna order a mini breadboard i can mount on the bot so i can keep messing with it.

but i think get what your trying to do ,

are those OR,or AND gates XOR ?  . are you using the 555 for PMW ? , are you just runing LED's while on the bread bord ?, try adding the output stage (motor driver) wile on the bread board see if it still works see if things heat up,  nice i hope it works for you 

ive had ideas of adding logic chips to uC for two layers of control ,still ideas