Hello I need an advice. I have two questions.
I am about to order Arduino Mega board. I need it for saving data logs (sensor readings) and I need logs to record the time and date of the reading .
I haven't worked with data logging yet. I've watched tutorial videos to learn about it.
I want to buy this board:
Geekcreit Mega +WiFi R3 Module ATmega2560+ESP8266 32Mb Memory
There is this build in flash memory of 32Mb.
Is it possible to use it for saving data logs?
Or do I need to order separate MicroSD card module?
My second question is
I assume I need to buy Real Time Clock Memory Module - one of those modules for coin battery.
So the arduino will set proper time and date after power black out.
Is this the function of this module?
I found separate Real Time Clock Memory Module
And combine version with MicroSD card interface.
So if I gonna need both MicroSD card and clock memory modules I choose the combine version.