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There is no need for a voltage regulator because the USB connection is already regulated by the USB output from your PC or laptop. The Arduino Mega can also be powered via the USB port. The maximum output current of the LD1117S50CTR is 800mA. Besides a higher input voltage than 12V has no advantage. But an input voltage between 7V and 12V is recommended to use the Arduino Mega over an extended period of time because otherwise the voltage regulator produces a lot of heat that can damage the microcontroller. I tried talking to Arduino Tech Support and was told to shove off so I'm just stabbing in the dark for now.The LD1117S50CTR provides a stable 5V output for the ATmega2560 and has a maximum input voltage of 15V. I will be reaching out to Adafruit where I bought the DIN mounts from to see if they are willing to help. This somehow leads me to think its an ICSP problem but I've traced that out too. I'm not sure what else to try because I h a pin for pin connection on both of them. TODO: Print Error message in HTML.Error LEDs/Codes - blink Built-inĪfter this failed I immediately, took both boards out of the DIN mounts and my codes output is as follows: Serial.println("ERROR - SD card initialization failed!") The output of my program is:Ġ9:55:29.707 -> ERROR - SD card initialization failed!Ġ9:55:30.694 -> ERROR - Can't write to log.csvĠ9:55:30.726 -> ERROR - Can't write to log.csvįor reference my SD initialization code is this: void init_fs(void) Thanks so much If more information would be helpful let me know I tried to be as thorough as possible.Īs you can see every single pin is connect on the Shield. If I am needing to hook up all of these extra wires then does the Ethernet shield really communicate through the ICSP?.Why does the documentation claim that it uses 50,51 and 52 when these are never connected while the shield is nested on the mega?.Does anybody have the ICSP pinout for both of these devices? My best guess is that something isn't lined up correctly on the DIN rail board.What pins am I missing to make this work? Aside from connecting all of them and then slowly eliminating one by one I don't see anything else I'm missing.Again, If I pull the boards out of the DIN rail mounts and stack them together the code runs as expected so it's not a firmware problem it's just a hardware connection but I don't see what I'm missing. Pins 13,12, 11, 10 and 4 connected via the black wires at the bottom but I'm still not able to initialize the SD card when I'm in this configuration. In the picture above, I have the ICSP Header connected via the ribbon cable. So communication is through the ICSP Header. On the Mega, the hardware SS pin, 53, is not used to select either the W5500 or the SD card, but it must be kept as an output or the SPI interface won't work. These pins cannot be used for general I/O. On both boards, pin 10 is used to select the W5500 and pin 4 for the SD card. This is on digital pins 10, 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. Reading the documentation of the Ethernet Shield 2 I see this:Īrduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header).