Hi, I have read all the topics relating to this issue but still cannot get it to work. I am using an Arduino Uno R3 with the Arduino Ethernet Shield v1 to try and read a micro SDHC card. I have tried 2 different cards, 8GB and 16GB formatted to FAT32. I also tried formatting as a 4GB partition in F…

So v1 of the shield doesn't work, but v2 does? And that's just switching the shields, and not changing anything else? Well I'm sorry I can't shed any light on what might fix it.

Ethernet shield V1 does work. I have one. No problem with the SD card. I have a web server docs on the SD card. Is this it? https://docs.arduino.cc/retired/shields/arduino-ethernet-shield-without-poe-module/ Edit: I haven't mentioned this in a while, but a problem with some ethernet shields were s…

@SurferTim Mine looks slightly different: [ethernet-shield-w5100-for-arduino-with-microsd-card-reader] My IC: [WhatsApp Image 2024-08-15 at 16.59.30]

the IC is the W5100 Ethernet chip

The pic isn't clear enough, but it appears that IC has solder bridges, 3 on the right and 2 on the bottom..

@SurferTim Yes, I can confirm it does look like there are bridges across some of the pins compared to my shield v2. But the Ethernet connection works fine, it's just the SD card that isn't working? Also, why does my shield look different to that in the link?

Do you have a voltmeter or o-scope?

Good. This sketch should allow you to determine if there is a problem with one or more pins on the SPI bus. Ensure the SD card is inserted correctly. It disables the SPI on both SD and W5100, then sets each pin HIGH, waits 5 seconds, then LOW. Check with your instrument of choice that the pin is HIG…

@SurferTim I have tested and can confirm everything is working as expected. Pins 4 and 10 remain HIGH throughout. Pins 11 to 13 each show HIGH when set with the other respective pins LOW.

Initializing SD Card Failed ?

Other Hardware Storage

r-p-h January 4, 2025, 8:20pm 31

@mcriasia No, I wasn't able to get it working.

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Initializing SD Card Failed ?

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