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So glad you got it working! Thanks for sharing!!
I only meant to point out the losses in DC-DC conversion, which would be significant if, say, you took an off the shelf converter module-those things get hot!. But hey, if you're spinning your own board, nothing is stopping you! I'm sure you can convert 0.5-1.5V to 3.3V with >90% efficiency. And you might be able to get the last 10-20% juice from the battery when it goes below 1V. So there's a marginal gain in power there. But can decrease the power consumption further by moving to say an attiny instead of the Atmega328 and using the lowpower library cleverly. Go for it man! Looking forward to the results :D
If you want to power it off of a single AA battery, you'll need a DC-DC converter. That will decrease the efficiency quite a bit as well.. But here's the smallest GPS module I could find. Here's a small 5V step up module as well.
In case you are wondering about some other module as well, I think this will help:Any GPS that send data using serial connection (identified by Tx and Rx wires on PCB or the word 'baud' in the datasheet) will work. :)
Oh, I had no clue about the Almanac information being transmitted.. I hope you don't mind if I include this in the instructable. Thanks a bunch!
Yeah, but it's not super accurate.
Glad you liked it!
The GPS itself draws about 50mA, so the bulk of the power consumption. You can do that by adding a switch between the Tx of GPS and Rx of the datalogger. But, since the power saving by doing that is minimal, I wouldn't advise it. Time to cold fix depends on a number of factors including -but not limited to- your speed, time and distance from last fix, cloud covert, how many satellites happen to be around.. I generally get a fix within 10-15 seconds.
OpenLog is based on arduino and the code is open source. I think it'd be quite easy to write a bit of code to start recording after a set interval. But, this project was aimed to be dead simple :)
Easy as pie GPS dataloggerView Instructable »
Glad you liked it! I'd love to see photos of your results!
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Glad I could help! It caught me off guard too :)
I'd love to judge in* Tech* Workshop
Of course, here's the Amazon link: MMOBIEL 25 in 1 Professional Toolkit https://www.amazon.com/dp/B00UNCG04K/ref=cm_sw_r_other_apa_VxNXxbGNS7T9K
Wooden Precision Screwdrive...View Instructable »
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My laptop's battery is not removable, and it acts as a great internal UPS.
That would be ideal, yeah. I don't know of such software for Macbooks though :/
Thanks! and I agree completely. Ideal would be a laptop power management level solution which lets you select what is the max percentage you want to charge you battery to. As far as I understand only lenovo thinkpads and few sony viao laptops have this option. I doubt it is even possible for many of the laptops out there. But I'm sure some hack like this would be possible for mac.
Yup, you're totally right. Fixed it in the circuit. I actually ended up using a FET with a built in protection diode.
Arduino based laptop chargi...View Instructable »
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