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- You Reply: @schluej
Sorry schluej, but you re taking nonsense. With those 4.9Ah you are saying that LattePanda is using 4.9 A over a period of one hour (or 2.45 A over 2 hours or maybe 0.49A over 10 hours) . That is energy you are taking about. Normally rechargeable batteries capacity is measured with Ah (or mAh) not output voltage and current of an power supply.
So by powering LattePanda is simple as that: Power supply must provide enough current (for all devices on LattePanda, USB if in use, CPU, mempry, drive) with constant voltage of 5V. If power supply is not providing enough current the voltage will drop (may be for protection, if not protected it will destroy itself, some funny current regulation of smart charger and so on...) and LattePanda will become unstable. And with any kind of battery charger one will have pure luck that LateePanda wil preform as expected.
You have to find "dumbest" possile power supply with appropriate voltage and maximun current ( 5V - maybe 3 Amps max) for normal operation of LattePanda.
May be something like this:
http://www.ebay.com/itm/221703338635?_t ... EBIDX%3AIT - You Reply: Thank you for your answers.
@schluej
Correct voltage for processor is probably provided by internal regulator to achieve stabilized voltage within tolerances. Processor is not powered directly from LattePanda power input. So input voltage (5V) does have nothing to do with 2% tolerance of processor voltage.
I'm well aware of amperage needed and all things that may affect proper operation (voltage drop on cable, "smart" chargers that adopt amperage).
I have no problems powering my LattePanda and it works great.
It's voltage limits I'm interested in for whole board (Vin min - Vin max) and I'm expecting answer like 4.9V - 5.5V.
Thanks. - You Reply: @acasta
Hi. We doesn't have electric plan of LattePanda so this is only speculation...
You can not use Arduino outputs directly for fan (as you say they are limited to 40mA per channel but also ATMEL CPU has overall current limit) but I think is safe to use 5V outputs that are right of Arduino white connectors. They are probably connected directly on USB power source. I will check this with ohm meter later on. - You Reply: I was looking at some HD video and after 15 minutes video playback started skipping frames and I noticed that generally computer was not as responsive as it should be.
Later on I discovered that CPU was running only around 600 MHz or even less. I checked CPU temperature and it was around 83 degrees Celsius. I have my LattePanda in acrylic box. I cooled down my panda with very lo tech solution - the hair dryer - and my Panda was back on 1.4 GHz sometimes even more.
The obvious conclusion: LattePanda must be additionally cooled down or in more spacious enclosure for proper temperature dissipation.
One question for LattePanda team: Will additional heat sink on metal surface where processor is located make any diference regarding cooling or I will have to find proper fan for cooling. - Topic: Auto start on power onYou Reply: Great. Thank you.
- Topic: Auto start on power onYou Reply: **. This is essential for my project.
- You Reply: I tried with Clonezilla and I can't pass initial resolution selection screen. I ended with windows build in tool.