Start
• Mavric-II
Board
• Sensor
Board
• LCD
Panel Board •
Sensor & Thermocouples •
Two-Axis
Accelerometer
• Radio
•
Radio
Packet Stategy •
Data
Logging
• Adaptable
System •
Sources and PDF
SENSOR
BOARD
The
sensor board allows the sensors to connect directly
to the main sensor board and lets the MAVRIC-II
sit on top and run the peripherals (see Figure 2).
As we did some research, we found that between the
twin wire interface (TWI, a.k.a. I2C) and the two
serial ports, the ATmega128 would leave the serial
peripheral interface (SPI) and parallel I/O pins
free for interfacing. IEEE 485 and CAN are also
available, but our sensors didn’t require them.
The SPI connections alone would let us communicate
simply with many Maxim sensors.
|
(Click
here to enlarge)
|
Figure
2—The main sensor interface board sits below
the MAVRIC-II. It contains all of the sensor
and radio interfaces and power regulation. To
simplify the wiring process, we designed the
system to be powered from the car’s electrical
system. |
We
then laid out the sensor board to be the same size
as the MAVRIC-II so they would stack perfectly and
leave the sensor headers exposed. We also decided
to add regulators for the sensors and peripherals
so they could get regulated power from the car’s
12-VDC electrical system.
