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KMoffett
Apprentece

USA
23 Posts
Posted - Nov 25 2010 :  11:10:35 AM  Show Profile  Reply with Quote
Mis-wired and/or a blown 555. Did you place a resistor in series with the LED to limit the current?

Ken
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foggyeyes
Apprentece

United Arab Emirates
18 Posts
Posted - Dec 06 2010 :  10:10:38 AM  Show Profile  Reply with Quote
Yes. Im using a resistor now.

There's a new problem now. The timing works fine using only an LED. Bnut when I use a relay in pararell, The circuit doesnt turn off. Even using JUST a relay, and NO LED doesnt solve the problem/
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jeal22
New Member

Philippines
2 Posts
Posted - Feb 18 2011 :  08:02:32 AM  Show Profile  Reply with Quote
This is the project given to us by our professor:
"It is required to start and run the three 12Vdc motors in sequence using one master START and RESET push button/switch. Once the START button is pressed, motor1 must start to run and followed by motor2 and followed by motor3 with 30 seconds interval from each motor. "
Can i use this http://www.aaroncake.net/circuits/relaytim2.asp?showcomments=all as reference ? and the next problem is that what's next after motor1 started? Can I use the same circuit as given?
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Feb 18 2011 :  08:28:17 AM  Show Profile  Reply with Quote
quote:
Originally posted by jeal22
Can i use this http://www.aaroncake.net/circuits/relaytim2.asp?showcomments=all as reference?

As we discussed in this thread, the circuit is too weak to drive a relay. You should use a 555 timer IC instead.
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Feb 19 2011 :  10:23:41 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Cascaded 555s, or a 555 pulsing a counter. Very easy to do.

But as it is assigned by your professor, it is your responsibility to do the work. So look upthe 555 datasheet, and then look up a counter IC (4017). Then figure the rest out.
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