I have a Duemilanove/Atmega328 I’m looking to use in a high-altitude ballooning project. I’m faily new to hardware, but after frying a few circuits in the past I already know my major weakness is power. Due to temperature constraints, I’ll be using some Lithium AA batteries @1.5V to power all devices, but the number of AAs is an open question. Any excess power converted to heat with my heatsink is a good thing, as long as it doesn’t fry anything.
- my arduino
- OneWire temp sensor (3-5V, <=18mA)
- Lassen IQ GPS module (3.3V, 27mA) with antenna
- SD card writer (via SDuFat), (3.3V, ampage unknown)
- SMS texting on a Motorola C168i via SSerial2Mobile - I don’t think I need any power for this as it survived in my freezer for a few hours without being used. But once I have everything assembled, if it needs more juice to send texts occasionally, this potentially could need power as well
Do you have any suggestions for the number of AAs I should use?
Also, all of my devices use 3.3V. Does the 3V3 socket on my arduino support all of this? Or should I use the 5V socket plus some heat? Or power them directly (plus some heat)?