Want me to send you some snow?Originally Posted by mackrackit
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Want me to send you some snow?
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NOPE!!! I like my sand. It gets to 120+f here in the summer, but I do not have to scrape it off the windows or shovel/plow it out of the way.Want me to send you some snow?
At the moment it is about 85, with a slight breeze
Dave
Always wear safety glasses while programming.
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120+ ... my thoughts... you can always start something on fire to stay warmNOPE!!! I like my sand. It gets to 120+f here in the summer, but I do not have to scrape it off the windows or shovel/plow it out of the way. At the moment it is about 85, with a slight breeze
You might not have to scrape the sand off your windows, but, over time, the sand will scrape the paint off your car!
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Cooling is not as bad as one might think, low humidity.120+ ... my thoughts... you can always start something on fire to stay warm
You might not have to scrape the sand off your windows, but, over time, the sand will scrape the paint off your car!
No paint on car, thats camouflage for us. Half way between Yuma Proving Grounds and Luke Air Force Bombing Range
Dave
Always wear safety glasses while programming.
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im in calgary alberta.. when you wrote CA, i thought maybe you thought i was in california..
its just starting to rain/snow right now. thats why i switched from big outdoor robots to making small indoor robots...
im not sure im happy with my battery choice for this bot. its a 730mAh 7.4V li-poly battery. my biggest issue is that its really not good to drain them past 2.5V/cell, so this pack can only go down to 5V. i may need to set up an ADC to measure battery voltage and have it shut down if it gets too low. and that gives me one more thing to worry about,.. i might remake the body so that its big enough to fit an alkaline 9V (its fibreglass and only took about 10 minutes to make). if i go to an alkaline, i cant charge it from a base station though, and nicads or nimh dont have much capacity.. alkalines are just ofver 500mAh at 9V, and the nicads are about 150-200 at 7.2V and nimh are about 300mAh at 7.2V....
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You've got the base set up so you can stack PCB's on top of it. Make a board that'll hold a pack of AAA NiMH batteries laid flat and sits on top of your other PCB. They go up to about 700mAh in the AAA types. As far as shutting down at 2.5v/cell on the Li-Poly packs. Easy to set up an ADC pin to handle that for you. Kill the motor drive once you hit about 2.8-2.9v/cell, and that gives you plenty of time to put the thing on a charger. Have it beep or something to let you know.
I most definetly wouldn't go with alkaline batteries. It'll end up like a kids toy...run it for 5 minutes, then change batteries...
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i dont really have a problem with stacking it vertically, if i do, i can actually fit about 5 AA batteries (nimh are 1800-2500mAh) which would give me 6 volts for the motors and lots of capacity for it.. and they are rechargeable..
only problem with that is finding a 5-cell holder. or i can make a 5-cell pack, and mountit somehow, but it would be nice to use a holder, cause then i can change them out quickly while im testing...
PS. we have freezing rain mixed with snow now!!!
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double post!!!
Last edited by dragons_fire; - 19th April 2007 at 00:32.
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