I'm planning to use a GSM module SIM7600 to send info from my arduino board.
I am reading in tinyGSM library that it requieres a 2A power supply but at the moment I can only use a power supply with less intensity.
Given that I would only use the GSM module to send few information and most of the time it will be in stand by I wonder if placing a capacitor makes sense to store the extra energy requiered in certain moments.
Does anybody have a link were I can calculate the capacitor requiered?
Do the capacitors take the same time to charge than to discharge? If the time is the same, does it makes sense to place it? (my guess is that if it is the same time, I will have a power shortage when charging)
In general, what should I take in consideration for placing a capacitor to have extra energy for the GSM module?
In principle, the thought appears to make sense, until you calculate how big the capacitor would have to be and then you'll realize it's not really going to work very well.
C = capacitance
Q = charge
V = voltage
You need to figure out how much energy (in Joules or Watt-seconds) it takes to get your GSM communication done. Then determine the voltage range your GSM module works at. Use the combination of these two parameters to determine the capacitor size you need.
Realize that you can't discharge the capacitor all the way to zero since your GSM module will crap out long before it ever reaches 0V; it'll likely only work between 5.5V and 4.5V or so, which means you would either have to use a very BIG capacitor that doesn't drop below the threshold voltage of the GSM device, or you'd have to be creative with some kind of boost converter that manages to squeeze out the last drop of capacitance at an acceptable voltage.
https://www.electronics-tutorials.ws/rc/rc_1.html
It depends on the current.
Since you have a low-current power supply, charging will of course take longer than discharging it; that's why you needed the capacitor in the first place, remember?
Bingo.
What you should take into consideration is that it's most likely an idea that'll get you stuck in layers of complexity you're not presently realizing, and at about 10% of getting it to work, you'll figure out that it's a better idea to just use a bigger power supply.
So let's take this into a direction that will actually get the job done: what is the context of this application and why couldn't you just use a more powerful AC adapter or a battery?
