General > General Technical Chat
Self-energising push buttons
vk6zgo:
--- Quote from: Nominal Animal on January 19, 2023, 11:38:16 pm ---
--- Quote from: Halcyon on January 19, 2023, 11:35:29 pm ---Hmmm... Bot much?
--- End quote ---
You're right. I was worried that someone even more newbie in electronics than I am would mistakenly believe that we're talking about reed switches here.
We're not; the switches discussed here harvest the energy from the button push to power the circuit itself for a very short moment, just enough to transmit a RF signal packet.
--- End quote ---
Seems like a seriously dumb idea to me--why not the CR2032 & a momentary switch, which only supplies power during its "On" time.
Nominal Animal:
--- Quote from: vk6zgo on January 20, 2023, 01:47:46 am ---
--- Quote from: Nominal Animal on January 19, 2023, 11:38:16 pm ---the switches discussed here harvest the energy from the button push to power the circuit itself for a very short moment, just enough to transmit a RF signal packet.
--- End quote ---
Seems like a seriously dumb idea to me--why not the CR2032 & a momentary switch, which only supplies power during its "On" time.
--- End quote ---
The switches are commercially available, and have been demonstrated to work well. So, why do you say it is a dumb idea?
I can imagine many scenarios where the lack of a replaceable battery would be a plus, especially if I had say a dozen of the switches. Replacing the CR2032 is a maintenance task that may be nontrivial; consider for example inset buttons with only the button head protruding. One has to have CR2032 in stock, too.
Wireless doorbell push buttons, for example. If I ever find a cheap outdoors one that can handle -45° to +35°C, I'll immediately have use for one.
PlainName:
My office doorbell uses one of these. It's just one of many available on Amazon. Feel is slightly squishier than a battery or externally supplied one, but not enough to make you think it's broken. Been stuck in the full force of English weather for four years with zero issues, where my previous ones were forever running the battery flat or otherwise succumbing to early care home syndrome.
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