The battery and the number of LEDs is the problem. Paul's suggestion of multiplexing the LEDs is a good one. 3AA's would be good too. -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Lindy Mayfield Sent: Friday, June 04, 2004 3:36 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [PIC:] First Project Finished! But... it used up all my bat tree Oh, I think I understand (I'm a bit slow). It is the battery that is the problem. If I used instead 2 AA's then it should last a long time? (I wanted to put it on my desk at work. (-: ) -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Robert Ussery Sent: Friday, June 04, 2004 21:29 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [PIC:] First Project Finished! But... it used up all my bat tree ----- Original Message ----- From: "Lindy Mayfield" >I connected my multimeter from +5 on the battery to the circuit and it reads about 75 mAmps. I'm quite new to this, but that seems >like a lot. It's a lot for a 9V battery, but not really a lot, considering that you're powering 20 LEDs, presumably at pretty high current. I don't think you can easily do much to reduce current consumption enough to use a 9V, besides dimming the LEDs. As someone else mentioned, 9V batteries are rarely or never used in always-on LED clocks, because of the high current consumption of LEDs. What you *could* do is to have the LED's turned off most of the time, with a button to display the time when you want to see it. Like someone else mentioned, just buy a 9V wall-wart, and use it instead of the battery. - Robert -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.663 / Virus Database: 426 - Release Date: 4/20/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.663 / Virus Database: 426 - Release Date: 4/20/2004 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu