I'm suggesting that for every hour of home entertainment use, the remote spends 2 seconds transmission time changing channels, and 5 seconds transmission time changing volume. Each key press translates to about 50msec burst data transmission. For the range required inside the home output power is very low, so less than 10mA is required.
If the batteries are also required to drive a real-time-clock and display, well, thats just a design feature. ISM transmitters can work down to 2.0V, and uPs can work to 2.7V, so 2 AAAs have enough voltage and amp hours to keep you going until you lose the remote behind the sofa cushions.
My own Yamaha AV receiver is 2.5 years old and still has the original manufacturers batteries in the remote.
So you are sugesting that one uses the home cinema remote as frequently as the swimming pool remote? Well... homecinema does not work autonomously and at least in my home has the biggest interaction with users through the remote. IMHO, 10 hours of operation time during the lifetime is way too low. And forget 3.6V expensive batteries, they are 10 times more expensive than AA. It seem for me that your 'cheap' sounds very expensive too me.
I can, we did, and we sell the product. Actually it uses a 1/2AA lithium thionyl chloride cell, but thats only because we needed 3.6V and not 3V. We could do it on AA's too. According to our calculations, the remote control would be in use for about 10 hours over the product lifetime, at 20mA thats well within the capacity of the battery. Sleep mode is 2uA. (In practice, most users lose the remote during the first 2 years of ownership). If you want to see the product, look up Ultramax robot. Your name is very common in a certain country, and thats where these products are made.
can you design a radio remote controll which will last 5 year or more? Here I have example of EnOcean in action which replaces universal remote from Bose (havey and powered by 4 AA batteries which I must replace 2 times a year) -- EnOcean does not need any batteries
It is easy to design sensors that can work for 5 years or more on a couple of AA (or even AAA) batteries. Most of us don't really have that many sensors in the house, and much of our battery powered equipment is "asleep" 99% of the day. In many cases, a set of batteries will last the lifetime of the product, as a)circuits can be designed for very very low power and b)the lifecycle of most electronic gadgets doesn't exceed 7 years (usually less).
Not so cheap for me. If you have many sensors scattered in your house which needs to be replaced usually once a year then this task is a real burden. It easily takes few hours yearly and my hourly rate is much higer than $0.16. For me, when I see sensor battery powered I look elsewere. Batteries put a real obstacle on automation scalibility.
According to me its great that there are alternatives of batteries but they cant be complety removed instead of harvesting energy and using /inventing rechargable batteries these batteries will still be in use .One should not through these batteries any where because they can be harmfull instead they should be recycled . Recycling of batteries results in income generation, reduction in pollution , saves energy and so on .
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