joe rocci

You’re not suggesting counting cycles through the main loop, are you? That can be very variable depending on what else the processor is doing while it’s awake. Personally, I’d do that in the background with an internal hardware timer that generates an interrupt telling you to go to sleep. From: George Alvarez Sent: Thursday, January 11, 2018 9:24 AM To: [gcbasic:discussion] Subject: [gcbasic:discussion] RE: [gcbasic:discussion] RE: [gcbasic:discussion] RE: [gcbasic:discussion] Coin powered projects...

Just saw this. Use one of the timers with a low frequency crtstal to count time in sleep mode. -------- Original message -------- From: George Alvarez mightycpa@users.sf.net Date: 01/10/2018 8:02 PM (GMT-05:00) To: "[gcbasic:discussion]" 579125@discussion.gcbasic.p.re.sf.net Subject: [gcbasic:discussion] RE: [gcbasic:discussion] RE: [gcbasic:discussion] Coin powered projects Hi Joe, Yes, I have the sleep thing coded already, and it shuts everything down according to the way the data sheet says to...

George Study the ATmega.da sheet to learn how to put the AVR into sleep mode and only wake it when needed. It continues to operate at very low current in sleep mode. Also, LCD can operate with virually no current if you get the right one and drive it properly. -------- Original message -------- From: George Alvarez mightycpa@users.sf.net Date: 01/10/2018 10:35 PM (GMT-05:00) To: "[gcbasic:discussion]" 579125@discussion.gcbasic.p.re.sf.net Subject: [gcbasic:discussion] RE: [gcbasic:discussion] RE:...

George Sounds interesting. You can make the microcontroller consume well less than a micro amp if you reduce the clock frequency and carefully manage what kind of circuitry you surround it with. Unfortunately, the Nano board is what it is. The interface circuits probably use as much power as the AVR. An LCD is inherently a very low power device. Backlights and such increase power dramatically. You should investigate how to put the microcontroller into sleep mode and only wake it when someting requines...

George Sorry about my last. I was working from your original post, then I had a system crash and when I returned I was looking at the last line of your recent post, which actually does have much more information. A doofus moment on my part. I still have the question “what is your requirement for run time”? If it’s more than several hours, you’ll need a bigger battery, or else go into sleep mode or some other reduced current mode when possible. From: Joe Rocci Sent: Wednesday, January 10, 2018 7:19...

George In order to get a precise answer, we’ll need precise information: 1) Describe the application and special functional requirements. 2) What is the hardware platform (commercial board, home brew PIC, etc)? 3) How long is the battery expected to run? Will it run continuously or does the device “sleep” when not in use? 4) How often do you expect to replace or recharge the batteries? 5) Are there size/weight/cost constraints? 6) What is the current draw of each piece of the system? If you don’t...

The big question is what it the mAh capacity of the cell and what does the circuit draw. Divide the former by the latter and you'll have an estimate of the run time in hours. What is your requirememt? -------- Original message -------- From: George Alvarez mightycpa@users.sf.net Date: 01/09/2018 6:04 PM (GMT-05:00) To: "[gcbasic:discussion]" 579125@discussion.gcbasic.p.re.sf.net Subject: [gcbasic:discussion] Coin powered projects Is anybody successfully running their project on coin cells? I'm finding...

Correction Www.b4x.com -------- Original message -------- From: joe rocci jdrocci@users.sf.net Date: 01/07/2018 6:10 PM (GMT-05:00) To: "[gcbasic:discussion]" 579125@discussion.gcbasic.p.re.sf.net Subject: [gcbasic:discussion] RE: [gcbasic:discussion] Wireless Programming PIC and AVR Chips Not that this is a direct solution to your requirememt, but check out B4A (www.b4a.com]. It's a very capable free app development environment that you program in Basic. It can compile for Apple, Android or Windows/Linux...