Been a long time since I last looked at a 555 datasheet but it seems they are more capable than I ever imagined. Now that many processors are on 52 week lead times we can squeeze more from of ol' faithfulls?
Do not scrimp by using the vanilla LM555 which lacks the magic functionality :)
piglet
Although it's not a biometric device, earlier this year, a 555 power bank keepalive was designed and built by me:
The gadget is used every single day and it works perfectly. The power bank lasts about a month between charges. The gadget's used exclusively to listen to audio books on dog walks and spins:
On a sunny day (Wed, 31 Aug 2022 21:26:12 +0100) it happened piglet snipped-for-privacy@hotmail.com wrote in <teog55$1t9ok$ snipped-for-privacy@dont-email.me:
Sure, I designed an ultrasonic distance meter with one in the eighties to measure water height in wells.
555 and some CMOS counters.
Yes, wonderfully versatile chip can do all sorts of weird and wonderful things.
So how many would you need for TI's April 1st application suggestion of iris biometrics?
piglet
On a sunny day (Thu, 1 Sep 2022 10:18:26 +0100) it happened piglet snipped-for-privacy@hotmail.com wrote in <teptd3$24qbf$ snipped-for-privacy@dont-email.me:
Well depends how many 555's you'd have to sell to get enough money for an iris biometric module? Think out of the box :-)
haha! Brilliant.
piglet
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