I have a project where I am using
raspberry pi 4 and
5inch touchscreen. This screen is from
waveshare but I have not enabled touch in it. I am using a USB splitter cable which on one end has usb male type and other end has two parts usb c type and micro usb. This C type usb is to power the pi and micro usb is used to power the screen. I am using
2.1 amp power adapter to power pi and screen.
When I boot the raspberry pi, it starts to display the under voltage and also in
dmesg I can under voltage warning. In order to resolve this, should I buy some adapter which has higher amps rating like
3.1amps or I should buy an adapter which has two usb ports so that the ports can supply 5v each to pi and screen. I am confused between volts and amps. Can anyone please help me. Thanks