Alan numitron clock
SNES Pi Webserver
USB Volume/USB toys
SNES Arcade cabinet
Game boy projects
Home Presence Detector
Rand Nerd Tut
Carnet du maker (fr)
ATmel blog (defunct)
auto usb power box
the one under the TV that plays music with RFID) I'd like the power of the 2.1 speaker system to turn on. Same, when I turn the pc off, I'd like the power of the speaker system to stop. Indeed, there is a manual power switch and lazy as I am, I can't not forget it...
20101208: 1h hour of job, it's done. Problem, I picked the wrong wallwart, the one I wanted to command spits 12V/3A which is too much for the 2A rated SSR. I have to go for a bigger relay. Still, this one turns on some nice ambient light thing .
20111122: OMG I just discovered it is a wellknown concept in Denmark! (not my stuff, I mean the idea) There is something great in the kingdom of Denmark ... link
The 2 leds %20 resistor are here only for the bling-bling. They are not in serial with the relay command, but it forms another loop around the USB power.
Version 1 schema (basically also version 2 since it's quite trivial)
Edit: this schema could use a small 100 ohm resistor before the diode to command the SSD, I never thought at the time to check the current consumption...
Version 2 : Solid State Relay kit from Akizukidenshi , max 25A
In this version, no protection nothing before the Optocoupler, just plugged to USB. There is a 300 ohm serial resistor, around 10mA will flow to trigger it.
In yellow, the Solid State Relay. In green, 2 green leds %20 a 100 ohm resistor in serial
Everything in the box when the USB is on (yeah yeah bling bling, I know, but I have 100 leds to use so...)
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