28029 Parallax Inc, 28029 Datasheet - Page 78

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28029

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® or Javelin Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 28029PAR

Page 66 · Smart Sensors and Applications
The accelerometer you will be working with in this text is the Parallax Memsic 2125
Dual Axis Accelerometer module shown in Figure 3-1. This module measures less than
1
Figure 3-1: Accelerometer Module and MX2125 Chip
People naturally sense acceleration on three axes: forward/backward, left/right and
up/down. Just think about the last time you were in the passenger seat of a car on a hilly
and curvy road. Forward/backward acceleration is the sensation of speeding up and
slowing down. Left/right acceleration makes you lean when making turns, and up down
acceleration is what you felt going over hills.
Instead of the three axes people sense, the MX2125 accelerometer senses acceleration on
two axes. The acceleration it senses depends on how it’s positioned. By holding it one
way, it can sense forward/backward and left/right. If you hold it a different way, it can
sense up/down and forward/backward. Two axes of acceleration is enough for many of
the applications listed earlier. While you can always mount and monitor a second
accelerometer to capture that third axis, three-axis accelerometers are also common.
/
2
” ×
1
/
2
” ×
For a 3-axis accelerometer, try our Hitachi H48C Tri-Axis Accelerometer Module,
Parallax part #28026.
Accelerometer Module
1
/
2
”, and the accelerometer chip itself is less than
MX2125 Chip
1
/
4
” ×
1
/
4
” ×
1
/
8
”.