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I will paypal someone $10.00 dollars to draw this in breadboard fashion for me! Answered


I really need help. I've been working on this dern motion detection alarm and am having problems with the delay circuit. I think I have assembled it right and it never works. I have completely re-done it twice! What it is supposed to do is once power from the relay is sent to the 555 timer it will impose a 1 minute delay before sending the power to the alarm/horn. This gives owner adequate time to enter code to disarm. The relay part of the circuit works fine and sends power to the 555 timer and latches as it should. However, the 555 timer never sends power out of pin 3. Could someone please, please, please draw the attached schematic in breadboard fashion so I can double check everything is assembled properly? I would really appreciate it!!!

Anyways I will paypal someone $10.00 dollars to draw this in a breadboard layout for me!


gmoon is right the the 68uF cap is shorted out or connected wrong.  Anyway below is a breadboard layout.

I usually use the horizontal rows for power positive and negative (only using the negative in this circuit).  Inner rows negative and outer rows positive.  That way any pins or components that need to be connected to positive or negative can be done directly. I always do those first.  Then other connections can be done.  If components are too big move them over and then run wires to were the component needs to be connected.  Keep wires flat, color coded, do the angle bends, and try not to have wires crossing each other too much.  I use fine pliers to strip and bend all the wires to the correct length and shape.  It can be time consuming but it makes it easier to trace the circuit if it doesn't work.  It also stops wires from being knocked loose.

Hope this helps.

555 Alarm Delay.jpg


Thank you very much. I already got it working. I had really messed up. I thought both of the vertical lines on the left were electrically connected and that both vertical rows on the right side were connected. I made it look much better this time as well. I shall post pictures of my completed project. Anyways I would still like to compensate you for your time and help! I wish I would have seen this earlier. What is your paypal e-mail info?

Don't worry about the $10. I'm glad to help, I only saw your question today.

The power rails X1, Y1, X2, and Y2 are all seperate single rails.On some breadboards they go all the way across the breadboard on some longer boards the rails are split in the middle so you have to link them to have power all the way across. That got me a few times when I first started with breadboards, power on only half my circuit :(

If you want to do your own breadboard designs you can try Pebble.
It was designed for picaxe micros but has various ICs.  I used an older version which is a bit clumsy to use, especially with connecting wires and bends.  The latest version might be better.

That is a cool program! Thank you! I work at a water well pump company: jandjpumps.com.

If you ever need a water/waste water pump or troubleshooting help, let me know and I will be sure to give you a killer deal!

Also looking at your circuit, you may want to put a diode across the relay coil. The diode should be in the opposite direction of D1. Depending on the relay the coil could produce a large negative spike when turned off. This could destroy the 555. Q1 is protected by D1 but the 555 has no protection. A diode across the relay coil will short out any negative spikes.


How about putting up macro shots of your completed circuitry so we can see what you did and maybe spot the problem? Do you have a voltmeter to check your circuit?


6 years ago

In your photo the positive supply (from the relay circuit) is connected directly to the trigger pin (pin 2), rather than through the 68uF cap.

Anyways I will paypal someone $10.00 dollars to draw this in a breadboard layout for me!


6 years ago

Yes, I do. I have voltage going into the 555 timer but not out of the 3 pin. Sorry for the ugly looking breadboard job. This breadboard from radio shack sucks! I had this circuit soldered onto perf board but could not get it to work. I placed it on the breadboard. I know I'm doing something wrong!

The two wires at the bottom were my positive & negative from the latching relay circuit. This is my first time using any kind of ic.