simlplest way to make a latching power switch via 555 flip flop
rwgast_logicdesign
Posts: 1,464
ok so im finally taking my propboard off a breadboard and soldering it on to a prefboard.. wanted to kind of get an idea of the flow for a pcb and i needed my breadboard back lol.
any ways its not too important but i decided i would rather use a push button instead of a toggle switch. basically the push button looks nicer and i dont have any radio shacks around so my mechanical switch options sorda suck only stuff at the home depot/auto stores which are kind of bulky.
well like i said i dont want to order anything dont have the time or else id just get a latching switch.
now i found this schematic http://www.electronics-lab.com/projects/misc/012/index.html i do have 555s around but i dont have a relay and i dont want to use one it to big. is there a way i can do this with a 555 and fairly common parts i could pull from old junk boards ive stock piled by ripping things apart. come to think of it i have a few old psu's, operate via push button maybe theres some usefull stuff in them. i know a 555 has a flip flop in it which i would need but other than that im sort of stuck.
if there is no easy way to accomplish this with few circuts (not a ton of board area left) than its cool ill figure something out, but i think a push button would be estetically pleasing and wouldnt require any force to move a loose board around like a mechanical switch.
any ways its not too important but i decided i would rather use a push button instead of a toggle switch. basically the push button looks nicer and i dont have any radio shacks around so my mechanical switch options sorda suck only stuff at the home depot/auto stores which are kind of bulky.
well like i said i dont want to order anything dont have the time or else id just get a latching switch.
now i found this schematic http://www.electronics-lab.com/projects/misc/012/index.html i do have 555s around but i dont have a relay and i dont want to use one it to big. is there a way i can do this with a 555 and fairly common parts i could pull from old junk boards ive stock piled by ripping things apart. come to think of it i have a few old psu's, operate via push button maybe theres some usefull stuff in them. i know a 555 has a flip flop in it which i would need but other than that im sort of stuck.
if there is no easy way to accomplish this with few circuts (not a ton of board area left) than its cool ill figure something out, but i think a push button would be estetically pleasing and wouldnt require any force to move a loose board around like a mechanical switch.
Comments
http://www.eevblog.com/2012/03/30/eevblog-262-worlds-simplest-soft-latching-power-switch-circuit/
@leon i thought there had to be a way to do this by using the prols logic, but i have no idea how. i cant wrap my head around how you would be able to use the prop when its not powered on. im guessing you would have to have it runnig in rc slow all the time or something to be able to pull off using a micro for a task like this. even so what would be the procedure? im guessing its probably as simple as connecting a button to a pin with a pull down resistor which runs some commands to boot the prop, but then if u were running an eeprom file w no src on the prop im not even sure howd be able to do this.
i dont need nething detailed just a basic over view of how using a prop would work. if it can be done with the prop not always being on and not effecting whats on a preprogrammed eeprom im all over it, either way just like to know how u would implement it.
well damg ill have to watch that when i get home, or search his you tube channel, i really need to start searching his videos when i have questions like this, the guy has a solution for everything. although in the comments someone posted this... http://img36.imageshack.us/img36/420/davidlw.png which is super simple im just not sure if ill be able to find those mosfets on anything
@leon i thought there had to be a way to do this by using the prols logic, but i have no idea how. i cant wrap my head around how you would be able to use the prop when its not powered on. im guessing you would have to have it runnig in rc slow all the time or something to be able to pull off using a micro for a task like this. even so what would be the procedure? im guessing its probably as simple as connecting a button to a pin with a pull down resistor which runs some commands to boot the prop, but then if u were running an eeprom file w no src on the prop im not even sure howd be able to do this.
i dont need nething detailed just a basic over view of how using a prop would work. if it can be done with the prop not always being on and not effecting whats on a preprogrammed eeprom im all over it, either way just like to know how u would implement it.
http://www.mouser.com/Interconnects/Circular-Connectors/Circular-DIN-Connectors/_/N-76q5gZscv7?P=1yzvtn9Z1yzxfxp&Ns=Pricing|0
http://forums.parallax.com/showthread.php?138694-Using-Propeller-to-control-it-s-power-source-Beau-Schwabe-Challenge!
im really liking this http://forums.parallax.com/attachment.php?attachmentid=90888&d=1332443992 seems simple and i could hopefully salvage the transistors off something easily or equivalents. that schematic should work to flip a 5v regulator on amd off independentaly right?