I mean I want to harvest 9V and 1 A every 10 min. I am thinking maybe with a microcontroller but I am not sure yet if it would work and I am looking for the best and most simple option. Thank youDo you mean you want to measure (as opposed to harvest) the voltage and current periodically?
The programming you can use depends on the hardware you choose. Do you already have something in mind?
The purpose is to save energy to support 12 hours ( 9V@1A). If I use it non stop for 12 hours it would be depleted after 2 hours. I want the battery life to last for 12 hours long or more without the need of recharging it. That is why, I need a program to use that battery(for exemple lithium or similar) during 1 minute every 10 minutes. The tasks that I require to do with that tablet also are needed for 1 minute every 10 minutes . Also I don't want to switch battery to have a bigger one in order to support 12 hours non stop. My objective is to have some program idea for saving energy and that's why I need helpWhat do you expect to gain by charging a phone 1 -2 minutes at a time every 10 - 15 minutes for 12 hours Vs just leaving it to charge normally in a hour like they are deigned to do??
Do your watt hour calculations. You gain nothing from the start stop charging cycles Vs running continuously until it's charged on total energy used or battery energy taken.
HOw can I connect the app with the tablet's battery to be able to control the battery?So you want the tablet to sleep for 9 minutes, then wake up for one minute and do some tasks, and then go back to sleep? (By sleep I mean a very low power consumption mode.)
This could be done two ways, and both depend on the details of your tablet. The "external" way would be to turn on an external power supply to the tablet. You can likely tell the tablet to stay awake always when on AC power, and to sleep quickly when on battery only. So you would get the effect you want by controlling the AC adapter.
The other way requires an app to control the tablet. The app would have to be able to wake the tablet. I've been doing something like this on an iPhone app and it's not the easiest thing. The language and code you would use depends on your OS.
That still won't do anything for the internal pad power control that he needs to deal with.To supply power to a load for 1 m. every 10 m. you could use a 555 timer to drive a P ch. FET.
Timing values about 1000 uF, 1 M R & 100 k R. gives 16 m. high, & 1 m. low= FET on.
by Aaron Carman
by Jake Hertz
by Jake Hertz
by Jake Hertz