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comment Programmable current sink
It's usually cheaper to buy than build, but here's a product whose design is open source (link at the side of the page): tindie.com/products/arachnidlabs/…
1d
comment Why not use symmetric encryption?
You typed it into the computer, which is entitled to (but might or might not) write the page to its swap file. There are APIs for "do not swap this page", but they aren't available from Javascript. Also you're vulnerable to EM and acoustic snooping on the keyboard. As usual it's all about the threat model ..
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awarded Supporter
2d
comment USB port identification by system
You can't identify the device without providing power to it, which will as you say charge it. So your requirements sound impossible.
2d
comment Why not use symmetric encryption?
.. which would mean that cracking the first message in the chain would give you all of them, and losing a message would be inconvenient. And it can't be automated so it will be very rarely used.
2d
comment USB port identification by system
Are you designing this hub which charges devices connected to it? The simplest design is just to leave 5V available to all the ports ..
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answered Why not use symmetric encryption?
Dec
16
comment LM35 output varies when connected to microcontroller
Please add a circuit diagram.
Dec
16
comment Using a solenoid to open a door
I very much doubt you can find a solenoid that can double its length in that form factor.
Dec
16
comment WLCSP MCU's - what hardware is needed for programming these tiny chips?
Just to make it clear, all the Atmel chips shown in that photo will have the same silicon die, just varying amounts of black epoxy packaging.
Dec
15
comment How to detect several agents within a radius, what is the best and easiest way to do it?
Room-sized RFID loop, using the lower-frequency kind of tag?
Dec
15
revised How do you design processors / microprocessor [ not broad ]
added 197 characters in body
Dec
15
answered How do you design processors / microprocessor [ not broad ]
Dec
15
comment Why do electronics have a low temperature limit?
Is that trapped flux the electromagnetic kind or the chemical kind used with solder?
Dec
13
comment Switching tone on and off at 120 bpm not working
You have no reset configuration so the registers will start off full of garbage or 'X'.
Dec
11
comment I just blew a capacitor. Now what?
Depends what the intended AC input is; 12Vrms = 17V peak. Some headroom is a good idea as well.
Dec
11
comment SN74HC138 demultiplexer. How do I implement a switch?
Or a set of 8 inverters or "inverting drivers": eg instructables.com/id/…
Dec
11
reviewed Leave Open What are the smallest microcontrollers?
Dec
11
reviewed Leave Open MCUs which can trigger an interrupt on a port mask
Dec
11
awarded Custodian
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