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From: email@example.com (Derek Agar)
Subject: Which Microcontroller to use?
Date: 19 Sep 2002 11:03:27 -0700
NNTP-Posting-Date: 19 Sep 2002 18:03:28 GMT
I am an EE student involved in a Senior Design class. While I have
had low level digitan design (constructing adders/subtractors ... from
gates), and have done some simple programming on a gal16v8 FPGA, I
have not done much more than that.
My question is what would be a good microcontroller (or should i look
to a good fgpa) to use for my design?
My group is implementing a car that follows another car based on
sonar. The microcontroller needs to:
1) Output a 35khz signal and a 45khz signal for about 250us
2) Send a signal to Reset the voltage trigger.
3) Start a counter/timer and wait for the 2 responses to get back.
(stop the car if no responses after 40ms)
4) Fill the 2 registers with the value of the timer at the time of the
5) After the 2nd response comes back, calculate the distance that the
car is away from the lead car and determine if the car needs to speed
up/slow down/stay constant and send this value to a Pulse code
modulator that will drive the motor.
6) Also determine if one of the sensors is detecting that it is
further away than the other and how much and drive a stepper motor to
control the steering.
I don't see speed of the processor as being an issue (we are looking
at a 1MHz crystal and most of the microcontrollers that I looked at
will do way above that)
We are looking at having an external voltage trigger, so we may not
need a voltage comparator.
I have done some C programming and would find that easier than to get
into assembly language, but I am not against it.
Thanks in advance
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