I have a mega 2560 where i connect RTC1302/SD MODULE/ ETHERNET MODULE W5100 / LCD 240X128
when i try to run program i find sd card failed and ethernet work but if i disconnect the ethernet power the sd work !! And when i connect the power of ethernet and sd in external power 3.3v they work all
What is the solution please because some time they work all in the same mega power !
any answer pelase ! i need help !
You definitely need an external 3.3V supply. The on-board 3.3V regulator can be used with low-power devices (sensors...) only, not with SD card readers or other power hungry devices.