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The Incredible Microcontroller - What Is it, and What It's Doing for You?
Microcontrollers are ubiquitous these days, being hidden away in everything from your microwave oven to your car. These amazing little devices can control a myriad of tasks from handling your answering machine functions to controlling that fancy SLR digital camera you just purchased. Typically they are found in TVs, VCRs, digital cameras, cell phones, laser printers, dishwashers, GPS units, and on and on. The industrial uses are too numerous to count.
What exactly is a microcontroller, and what does it do?
A microcontroller is basically a
computer on a chip along with some other devices such as timers and
counters, and analog to digital converters etc. By putting nearly
everything you need on a single chip the cost can be reduced
significantly. It's one of the really cool inventions in my opinion.
A typical low-end microcontroller chip might have 1,000 bytes of ROM and 20 bytes of RAM on the chip, with eight I/0 pins. In large quantities, the cost of these chips can sometimes be just pennies. You certainly are never going to run Microsoft Word on such a chip, but you don't need Microsoft Word to control a microwave oven, either.
A typical microcontroller and an application
I've been working with a typical
microcontroller chip lately, a PIC 12F675. This little chip has 8 pins
and it's about half the size of a dime. Inside is a programmable
computer, RAM memory for temporary data storage and Eprom memory for
permanent program storage. It also has several counters, timers,
comparators, and analog to digital converters. You simply plug it into a
socket on your programmer and program it to do what you want. Then plug
it into a socket on your circuit board and you are off and running.
I recently built a controller for a pump with one of the PIC 12F675 chips. Two of the eight pins are for power, leaving 6 pins for getting data and control signals in and out of the chip. For this application I hooked a temperature sensor to one pin, a volume control to another pin, and a push button for a third pin. These are used as inputs. The volume control is used to set the temperature level for switching, the push button starts the pump, and the temperature sensor tells the pump when to shut off. I used a fourth pin to control the relay running the pump.
A complete temperature control system on a $1.00 chip. With a power supply and the controls and relays the total cost was about $10.00. In high volume manufacturing the cost would probably be about $2.00 for the whole works. That is one of the beauties of microcontrollers... the extremely low cost.
These devices come in a variety of configurations with widely varying amounts of memory and peripheral devices on the chip. I've used microcontrollers with as few as 6 pins, and several times I've used chips with 40 pins. Those big 40 pin chips can run over $10.00 each in small quantities, but man do they have power! Like I said before...a really cool invention.
Programming microcontrollers is easy
The programmers are very simple
costing less than $100.00, sometimes much less. You can program the
chips in assembly code, or use a compiler and a higher level language
such as BASIC. I use basic since it makes programming much easier and I
don't really want to learn assembly language.
There is a ton of online support and forums for users of these chips, and there is no shortage of application examples and information available from the manufacturers. If you are a hobbyist or are interested in controlling things you should try your hand at building some circuits with these fantastic little devices.
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