Limits of Externally Regulated 5V Power

Other Hardware General Electronics
6

septillion:
Perfboard is designed for that :slight_smile:

But 800mW is still only 160mA and I don't know which touch screen but combined you're probably <300mA. I would indeed not draw that from the Arduino but it's an order of magnitude less then 2A :smiley:

Reread that post. He has 8 MQ sensors. I'm guessing with the touchscreen it's close to 1.5A, so a 2A supply is in line with what is needed.