UptownMaker

Tamiya is a Japanese company that makes many hobby-type products- model kits, "experiment" sets, RC toys, and others. Deeply buried in their product line is a set of generic motor/gearbox combinations. These range from very simple to very complex; I have a couple of their high-power ones, and one of the 6-speed ones as well. They are well constructed, fairly tightly toleranced, and loaded with features. The have a twin-axis gearbox, a worm drive gearbox, and a planetary gearbox, in addition to more "standard" types. Typical cost is between $10 and $20, depending on the model. One of the most enjoyable items in the hobbyist robotics arsenal is the RC servo. However, most servo motors tend to be either pricey or weak, and they tend to be non-reconfigurable, meaning that you can't readily trade off speed for torque or vice-versa. To that end, I'd like to make a small PCB that would let me take an input from a shaftless potentiometer attached to the output ...

Lately I've become obsessed with multiprocessing solutions for hobby level embedded systems. A PIC12F683 is a reasonably powerful 8-bit microcontroller in an 8-pin package, and it sells for right around $1 in qty 25. This can provide a powerful means for offloading certain functions of a circuit to another IC at minimal cost, allowing you to do heavier lifting in your main circuit than you otherwise might have. An example is servo-motor control with the Arduino. It's quite do-able, but you may find yourself in a project where you want to control a servo's rotational position based on user input from a potentiometer. In that case, using precious CPU cycles from the Arduino in the system just to read the pot and update the servo periodically is a drag. So why not take an 8-pin PIC and make a simple IC that reads digital inputs and converts the value to a servo angle? It'd be easy enough- the servo output is a PWM signal but the duty cycle is low. The motor holds po...