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Can't use SD with Eth Shield

userHead MrC 2012-09-27 09:41:34 3239 Views2 Replies
Hi,

I use the SD card like this: [url=http://blog.nikolay.ca/data/gallery/sd_card/large/157.jpg]http://blog.nikolay.ca/data/gallery/sd_card/large/157.jpg[/url]

If I connect it to the arduino pins, without the eth shield (SKU:DFR0006), it works. If I connect the eth shield and the sd card in the eth shield pins, it doesn't.

I tried different CS pins (4 and 7). Both work without eth shield.

Why is that? Are the SPI connectors unusable through the eth shield?

Thank you.
2012-09-28 02:59:28 Will examine those! Thank you! userHeadPic MrC
2012-09-27 20:13:25 Hi,

I remember that there's a spi interface conflict in the old version Arduino Ethernet shield. So there're some small tricks when connecting the SD card and the W5100 Ethernet chip.
You could take a look at the schematics of the Arduino Official ethernet shield and DFRobot Ethernet shield to figure out the "tricks".  ;D

Arduino Ethernet shield schematic: [url=http://arduino.cc/en/uploads/Main/arduino-ethernet-shield-06-schematic.pdf]http://arduino.cc/en/uploads/Main/arduino-ethernet-shield-06-schematic.pdf[/url]
DFRobot Ethernet shield schematic: [url=https://www.dfrobot.com/image/data/DFR0125/Ethernet%20ShieldV2%20SCH.pdf]https://www.dfrobot.com/image/data/DFR0125/Ethernet%20ShieldV2%20SCH.pdf[/url]
userHeadPic Lauren