Timeline for Boost converter for powering SD card
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Apr 28, 2020 at 22:55 | comment | added | NickG | @Justme I apologize, I meant to say I need to store on-system data for 3 weeks, that would be around 280Mbytes. The battery life however should be at around 4 months. The accelerometer needs around 10uA. I will be using an ATmega328p, so when active, it needs 5.2mA and powered down it needs only 4.2uA. Should I consider an alternative form of storage as well? | |
| Apr 28, 2020 at 21:56 | comment | added | Justme | 4 months is roughly 3000 hours. For example a 1000 mAh lithium ion battery weighs 22 grams. You need to get average consumption below 0.33 mA. What is the consumption of the accelerometer and the MCU now? | |
| Apr 28, 2020 at 21:25 | comment | added | NickG | Great point. Do you have any design alternatives I could consider, perhaps adding a large capacitor to handle the high current requirements? The project is a small scale embedded system that needs to store data from an accelerometer, for 4 months, at 10Hz. The trick part is that the whole weight should not exceed 30grams, and the size should be 50mm X 40mm X 20mm | |
| Apr 28, 2020 at 20:25 | comment | added | BeB00 | To add to this, the battery probably has around 100 ohms of internal impedance, so even if you try to draw a high current (which will damage the battery), the absolute max power you can get out is ~25mW, which will be at 1.5V | |
| Apr 28, 2020 at 20:25 | history | edited | Justme | CC BY-SA 4.0 |
added 77 characters in body
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| Apr 28, 2020 at 20:10 | history | answered | Justme | CC BY-SA 4.0 |