Expired
ZSDOIT TT02 Robot Tank Car Chassis for Arduino, etc.
Deal Score+2
$12.50
$24.99
$12.50
$24.99
Looks cool, and the price is good…. wish the reviews were slightly more positive.
These have just 2 motors and not servos. The problem with that is that even when powered the same params (PWM/votltage), the two motors would turn at slightly different speeds (because differences in windings, resistance, gear friction) and the chassis won’t move at the same speed but lean to one side.
So in the kit i had a while back (20 yrs ago? maybe this https://www.ebay.com/itm/133747949972 ), one had to use trimmer potentiometer to make them go straight but that was not perfect (as battery voltage lowered over time, it would stray). And so better built ones like https://en.wikipedia.org/wiki/Scribbler_(robot) had servos for the wheels (basically sensors of wheel turning, like what the mechanical computer mouse had)