Can this be done with the 555 ? - Page 2 - Electronic Circuits Projects Diagrams Free

ericgibbs · 23rd April 2008, 12:12 PM

Quote:

Originally Posted by TCDK

link would do it much easyer ´

http://uk.geocities.com/ronj_1217/c4060.html

hi,
The 4060 is the easiest way to go for preset time periods.
You can use a crystal osc predivider to drive the 4060 if your require more accurate timing.

blueroomelectronics · 23rd April 2008, 03:29 PM

Putting a watch crystal (32.768kHz) on the CD4060 will make it a 2Hz timebase. There are 86,400 seconds in a day so you'll need some sort of divider to trigger something like a 555 for the 30 second on time.

If you don't use a crystal it'll be difficult to adjust the circuit as shown accurately as the clock must be 5.2734375 Hz

I wonder how you set the ON time with the circuit?

PS that talking electronics programmer is yet another JDM style programmer (and can be somewhat difficult to get running), search the forums for "JDM" before you decide. The PICAxe are popular for a one off project, not sure if you can connect a crystal to them.

If you want easy (writing a 24Hr 30sec on timer is not too tough) you could download the free PICBASIC Pro demos; 40lines of code, more than enough for this project but limited PIC support PIC12F683, 16F627(A), 16F628(A), 16F84(A), 16F688, 16F690, 16F870, 16F871, 16F872, 16F873(A), 16F874(A), 16F876(A), 16F877(A)
http://www.melabs.com/pbpdemo.htm
Of course I sell a PIC programmer & kits so my opinion may be biased.

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23rd April 2008, 03:29 PM	(permalink)
blueroomelectronics	Putting a watch crystal (32.768kHz) on the CD4060 will make it a 2Hz timebase. There are 86,400 seconds in a day so you'll need some sort of divider to trigger something like a 555 for the 30 second on time. If you don't use a crystal it'll be difficult to adjust the circuit as shown accurately as the clock must be 5.2734375 Hz I wonder how you set the ON time with the circuit? PS that talking electronics programmer is yet another JDM style programmer (and can be somewhat difficult to get running), search the forums for "JDM" before you decide. The PICAxe are popular for a one off project, not sure if you can connect a crystal to them. If you want easy (writing a 24Hr 30sec on timer is not too tough) you could download the free PICBASIC Pro demos; 40lines of code, more than enough for this project but limited PIC support PIC12F683, 16F627(A), 16F628(A), 16F84(A), 16F688, 16F690, 16F870, 16F871, 16F872, 16F873(A), 16F874(A), 16F876(A), 16F877(A) http://www.melabs.com/pbpdemo.htm Of course I sell a PIC programmer & kits so my opinion may be biased. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com