Page 271 - Making PIC Microcontroller Instruments and Controllers

2?O AT ABTFTCIAL HONEOft A IABLE SUNFACE THAT STAYS IEI'ET

A sampling ofpossible BASIC Sfamp module applications wi& the Memsic 2125 include:
Dual-axis tilt sensing for autonomous rcbotics applications
Single-axis rotational position sensing
sensing for alarm systems
Movement/lack-of-movement
R-/C hobby Fojects such as autopilots
Memsic (wwwnemsic.com) providos the 2125 in a surface-mount format Parallax
mounts the circuit on a PC board pioviding all VO connections so it can easily be
inserted on a b{eadboard or though hole prototype area.

The actuaton we will use for the hodzontal position conection of the table will be
two radio control (R/C) hobby servos.

Discussion

There arc two ways we can mount the sensor to conect the tilt of the table. We can mount
the sensor on the base that is being tilted or we can mount the sensor on the actual table
we want to keep levol. (A tbird way would be to corect for ihe hlt in one direction by
sensing base tilt, and in the other direction by detecting table tilt. This is an intercsting
academic exercise that we will not undertake horc lbut you may want to play with it on
your ownl.)

WmXW An anlftcial hoiizon-a basic unadorned cardboard
horizontal table wilh a couple of levels and a gravlty sensor. (simple
is adequate our purposes,)
inexpensive construction lor