The High Cost of Embedded Computers

Every morning I like to go for a nice 10-mile bicycle ride. There are two factors that determine how quickly I will complete my ride. The first is if there is any wind. The second is how many times I get stopped because of traffic. Constantly being stopped because of traffic lights has me despising them more and more. It also has me thinking about the large computers that run them and why they have to be so big and expensive.

This got me thinking about how home and office computers have become so powerful and relatively inexpensive while the functionality required for a traffic light has remained unchanged for decades yet the cost hasn't matched normal computer pricing trends. Furthermore it seems that computers embedded in everyday objects such as cars are equally expensive. When you buy a new car the salesperson will justify the always increasing price with the complex computer inside. The funny thing is that automotive and traffic light computers are really simple and could be handled by the same computer chips found in ancient computers from the 1980's.

If you have never seen a traffic light computer, it is the large box located on one of the corners of the intersection it guards. They are generally about 4-feet tall, 3-feet wide, and 2-feet deep. That's a big box for something that can be run by a less powerful chip than I have in my watch. Now I can understand the size when lights required so much power to remain visible during daylight hours. Now we have ultra-low-power LED lights that don't need much power at all. So what is the big box for? My guess is it has to withstand a car running into it. It probably also goes towards justifying the $70K required for each intersection. Think about it though, if you could run a traffic light off the same computer found in a watch, you could put it in a much smaller box on one of the poles and save taxpayers a significant amount of money.

I know there are a lot of embedded computers that have dropped in price as one would expect. After all we have a lot of toys available that wouldn't be possible without such inexpensive electronics. I just wish those cost savings could be passed along to more things. Things I find I am paying more and more for that I honestly don't really want nor like.