does anyone know how i can get a signal from the graphics card that will signal a circuit when the monitor is off or in standby, i'm sure there must be something because the monitor is put into standby through the computer. thanx snood
My mate has a 19"" tft screen, he can turn it on the u see hte screen for 1 sec the turns off. The company says its the inverter.
eh.. i think ben misunderstood something.. or is it me?... anyway.. i think that if the monitor looses some signals it senses that it should be turned off... when you turn on the monitor without turning on the comp it wil usually go on then in standby... the same thing happends when the comp turns off the monitor after showing the screensaver for a while.. (optional)
i'm sorry to hear about ure friend screen ben but i dont see what that has to do with my question? ok so anyone got an answer thats a bit more technical related? Snood
The monitor has a circuit in it which makes it go into standby mode when there is no data signal coming to it. So thus when the computer goes into monitor power saving mode, it stops sending data to the monitor and thus subsequently turns off. When data is then again recieved it pops back to life. The mystery of how your monitor turns off is all in the monitor itself.. The computer only kills the signal not the power to the monitor.. anyhoot have fun.
Well in that case thats my monitor signal idea out the window without a parachute. next idea....... witch i'm not too happy about, coz it means i have to think and i'll probably get frustrated. howeven i'll have to do it. this idea is to write software that uses the serial port to communicate with my (still in design stage) fan, light controller. i suppose it will give me more diversity and allow me to controll my pc lights and fans from my computer and even have presets so it shuts the pc up and turns the lights off when watching a move. hey i guess it will be good afterall (with a lot of help from all you bit-techies) Snood p.s anyone wanna give me a hand with VB? coz i'll be needing it
http://www.quasarelectronics.com/3074.htm http://www.electronic-kits-and-projects.com/kit-files/3xxx/3074v2.pdf check this one out... it have software and drawings and everything... i have made such board myself... works just fine.. even made a small program for it... also: if you don't have equipment to make one you can buy the kit..
ok well i need at least 8 signals, for the following, fan 1 increase, decrease fan 2 increase, decrease fan 3 increase, decrease fan 4 increase, decrease and other channels for these LED's on/off/switch between red blue or both cold cathode on/off/switch between red/blue/both i want to feed these signals into PICS probably and in turn this would power motorised potentiometers. however i would like to be able to sense what level the pots are set at... any suggestions.... heres basically what i'm going to be doing i'm going to be making a baybus that willl be able to be manually controlled via pots but iw will also be computer controlled (the pots are motorised) i also want to manually controll the system lights and to have then comp controlled, so that for example when i play a dvd, it turns the fans down and turns the case lights off (custom software i hope) what would be gr8 is if i can integrate remote control too , i see this being a long hard project, but worth it in the end. Snood
The DPMS system, which is what turns the monitor on to standby mode, works like this. Normally the video signal had both horizonal and vertical sync signals. By turning one or both of the signals off, various standby and power down modes can be enabled. You can google to find out what signals correspond to what mode. Anyway, the way to get a signal is to splice in to the monitor cable at some point (or perhaps use the second connector of a dual-head card) and tap these signals. You don`t want to degrade them too much though or your picture quality will deteriorate. Perhaps you could feed them into a high frequency transistor or even an opto-isolator, rather than using them "directly". Anyway, once you have the signals, you could probably just smooth them out with capacitors into something usable, or perhaps use a resetting trigger circuit to generate a stable output. Then, you have your signals. The only other possibility is to open the monitor and look for signals controlled by the standby function. A good place to start would be the power LED which often changes colour to show what mode the monitor is in, or the relays/transistors around the cathod ray generator. Be careful though, monitors contain lethal electrical currents. MoJo
