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7c21fba)
speed is guaranteed to be non-negative by this point in the code, so
there's no need to test if it's too negative.
else{ // speed is 0
off(forward_pin);
off(backward_pin);}
else{ // speed is 0
off(forward_pin);
off(backward_pin);}
+ // since speed has been set positive, no need to check if speed < -255.
if(speed > 255){
speed = 255;}
analogWrite(speed_pin, speed);}
if(speed > 255){
speed = 255;}
analogWrite(speed_pin, speed);}