Finally connected a relay!
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I couldn't get an optoisolator. But its well protected with diodes. :)
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
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Hey guys! I had been planning to control a relay from my parallel port for quite a while..I've finally done it! I'm using it to control a table lamp! It's so much fun!! The circuit protects my computer's parallel port..so I won't run into the risk of blowing up my computer. Now, I'll build a virtual, laser controlled switch board for controlling everything (I've already made a program which creats hotspots in my house which can be activated with a laser!) I'll put this on my blog soon. Ashish :D
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
Do your parents know about all your shenanigans? -- modified at 14:36 Thursday 18th January, 2007
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Check out the "relay controlling circuits section" here: http://www.epanorama.net/circuits/parallel_output.html[^] I've seen people using this design without any problem. There's a "backward facing" diode across the relay coil which protects the circuit from reverse emf generated by the relay. Aditionally, the relay is controlled by a transistor..which in turn is protected by a diode and a zener. So, in the worst case, the transistor could get shorted out. :)
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
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Do your parents know about all your shenanigans? -- modified at 14:36 Thursday 18th January, 2007
lol. Yes :)
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
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Hey guys! I had been planning to control a relay from my parallel port for quite a while..I've finally done it! I'm using it to control a table lamp! It's so much fun!! The circuit protects my computer's parallel port..so I won't run into the risk of blowing up my computer. Now, I'll build a virtual, laser controlled switch board for controlling everything (I've already made a program which creats hotspots in my house which can be activated with a laser!) I'll put this on my blog soon. Ashish :D
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
Is that laser capable of vaporzing other "bad" developers by chance?
Todd Smith
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Is that laser capable of vaporzing other "bad" developers by chance?
Todd Smith
Yes. :)
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
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A decent relay gives over 1,000 Volts isolation between coil and contacts. He has dealt with the back EMF issue so the only remaining question is about the load the coil is putting on the port. Elaine :rose:
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A decent relay gives over 1,000 Volts isolation between coil and contacts. He has dealt with the back EMF issue so the only remaining question is about the load the coil is putting on the port. Elaine :rose:
He seems to have buffered the port pins with a driver transistor, though I haven't seen the circuit. That should adequately protect the port from overcurrents.
"...a photo album is like Life, but flat and stuck to pages." - Shog9
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Hey guys! I had been planning to control a relay from my parallel port for quite a while..I've finally done it! I'm using it to control a table lamp! It's so much fun!! The circuit protects my computer's parallel port..so I won't run into the risk of blowing up my computer. Now, I'll build a virtual, laser controlled switch board for controlling everything (I've already made a program which creats hotspots in my house which can be activated with a laser!) I'll put this on my blog soon. Ashish :D
Time flies like an arrow; Fruit flies like a banana. Ashish Derhgawen - http://ashishrd.blogspot.com[^]
Good deal, keep it coming! Just wish I had the time to play :(
Rocky <>< Latest Code Blog Post: SQL Server Express Warnings & Tips Latest Tech Blog Post: Ready for Internet TV?
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You, sir, are a very dangerous person. :)
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001He hasn't found a way of hooking it up to Jeff's missles yet though, or my air-rifle :rolleyes:
I have no idea what I just said. But my intentions were sincere.
