Hi everyone
So I've just finished my first project and I'm ready to start my second but I've run out of storage space.
So my idea is to run a sparkfun pro micro (needs to be a ATmega32U4) powered off the PC usb then run a mega 2560 from the pro micro with a ili9486 shield mounted.
Theres also 6 rotary encoders and 9 led switches connected to the mega.
Will the USB supply enough power?
Will the power out of the pro micro be enough to supply the mega?
I'm asking as I don't currently have the hardware to test and most of the controllers/screen state tbd under power consumption.(I no it will vary just want a rough idea before I pony up £60 on controllers).
I would rather not use a second power supply to the mega but if needed I could supply through the barrel Jack.
This would make the finished product very ugly and I'd like to avoid this at all costs.
it really does need to be 2 controllers I think I'm just going to power the mega off its barrel Jack at least for the time being.
I'm wanting to add multiple touchscreen gui's with over 300 outputs to the PC so the leonardo has no where near enough memory.
(I haven't written any code for v2 yet but from my experiments with my leonardo and the examples in mcufriend_kbv there isn't going to be enough space)
The mega does have enough but it doesn't support the keyboard.h Library.
Cadvice:
it really does need to be 2 controllers I think I'm just going to power the mega off its barrel Jack at least for the time being.
The "barrel Jack" is only useful if you do not need the Mega 2560 to have anything connected to it that draws a significant current - beyond 30 mA or so in total.
Proper way to power it is using a common USB "phone charger" to the USB port or the 5 V pin.