Page 234 - Robots Androids and Animatrons : 12 Incredible Projects You Can Build

Mobile platforms 10

PLATFORMS ARE THE FOUNDATION FOR MOBILE ROBOTS.
There are two options: build or buy. If one has good mechanical
ability or is willing to learn, building a platform from scratch offers
distinct advantages. The platform is designed and built for the spe-
cific task and purpose of a robot. One has an almost unlimited
choice of drive motors, gearboxes, mechanical linkage, power sup-
plies, etc. 213

Buying a mobile platform relieves one from building a platform.
But one is left with the gear ratio and power and speed designed
for a different purpose. Here is a case in point: Most electric cars
move too fast. If one doesn’t have mechanical ability, this is the
way to go. Typically one buys a radio-controlled (R/C) electric
car. The radio controls are stripped from the unit. The electrical
connections (wires) to the steering control and drive motor are
retained.

Here are some things to keep in mind when purchasing an electric
car for conversion. First, don’t choose a car that’s too small or lies
too close to the ground. A small size will make it difficult to fit sen-
sor systems and microcontrollers onto the chassis. If the car lies too
close to the ground, it will get stuck easily. Choose a car with a high
wheelbase.
Figure 10.1 shows an electric car that is a bad choice for turning
into a mobile robot. It’s too small to carry substantial weight, and
notice how low to the ground it lies. This car will get stuck easily.
Figure 10.2 shows a better choice. The platform is larger (can fit
more components) and has a high wheelbase.

Team LRN Mobile platforms

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