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THERMAL/LINEAR INTELLIGENT
SENSOR PICtail? PLUS
DAUGHTER BOARD
Chapter 4. Linear Interface Demonstration
This chapter describes a simple program that demonstrates how to use the Daughter
Board to capture and process signals from any generic linear sensor through the linear
sensor interface.
4.1
DEMONSTRATION OVERVIEW
The CD that accompanies the Daughter Board contains a linear interface demonstra-
tion application. All files pertaining to this demonstration are located in the following
folder on the CD: demo\Linear Interface Demo .
As shown in Figure 4-1, this sample application uses the Daughter Board to perform
signal conditioning on an incoming 3200 Hz sinusoidal signal, and uses the on-chip
ADC of the dsPIC33FJ12GP202 device to convert the signal to a digital form. A
1700 Hz noise source is artificially added to the sampled signal in software, thereby
modeling the effect of narrowband noise on a sampled sensor signal.
In addition, the application software uses the DSP features of the dsPIC33F architec-
ture to filter out the 1700 Hz narrowband noise using a highly selective notch filter. The
filtering is performed using the Finite Impulse Response (FIR) filtering function from the
DSP library, which is included with the MPLAB C30 compiler.
The noise-corrupted input signal (filter input) and the noise-free output signal (filter
output) are plotted on the Data Monitor and Control Interface (DMCI) using the MPLAB
REAL ICE in-circuit emulator.
FIGURE 4-1:
LINEAR INTERFACE DEMONSTRATION
AN7
Add 1700 Hz
Narrowband Noise
FIR Notch Filter
Conditioned 3200 Hz
from Lookup Table
Sinusoidal Signal
from Function Generator
dsPIC33FJ12GP202
Data Monitor and Control Interface
(MPLAB ? REAL ICE?
in-circuit emulator)
The demonstration program consists of the following basic software elements:
? 2008 Microchip Technology Inc.
DS70574A-page 23
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