Reddit reviews MakerFocus 4-Wheel Robot Smart Car Chassis Kits Car Model with Speed Encoder for Arduino
We found 1 Reddit comments about MakerFocus 4-Wheel Robot Smart Car Chassis Kits Car Model with Speed Encoder for Arduino. Here are the top ones, ranked by their Reddit score.
The car comes with tachometer encoder.Mechanical structure is simple, very easy to install.Four actuations, horsepower fullness.The chassis big and steady very easy to expand.Uses four deceleration direct current machine curve to be nimble, the directivity is good.
The robot kits have the same motors as from your first OP link.
Of course it depends if you want two motors or four (also 4wd kit). Four won't make it faster, but you get more torque.
If you apply around 6v, e.g. 4 batteries, the motors will go at high speed. If you remove one battery (~4.5v), (brige the gap with a crocodile clamp cable or tinfoil), it'll go slower.
If you really need very precise speed reduction, you could add a potentiometer (even make a voltage divider). But the small potentiometers can not handle high currents.
Yes, if you have the Arduino, the H-Bridge (single or dual?), it will be a pretty good solution as you can control the speed easier.
With a transistor/mosfet/H-Bridge, you can just use analogwrite. You can ad a potentiometer (a small one will do in this case) to set the speed without having to use serial; https://www.arduino.cc/en/Reference/AnalogWrite - or you just hard-code it (e.g. analogWrite(pin, <0 to 255>); - But as the battery voltage drops after a while, the speed will change.
To get the most reliable speed, a rotary encoder, or even stepper motors, can be a nice (but more complex solution).