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If you want to physically remove the pull down resistor arrays from the board (which will wreck the SD feature) the array is RN6 on the schematic and is located immediately below the main ICSP header stack. It is a 1K array labelled "102". Caution: there is another "102" nearby; make sure you remove...
D4 is used as the Chip Select signal for the microSD card reader/writer. If you are determined to use it for a pullup input it would probably be wise to make sure no card is in the card holder. Then just do (in the setup function): pinMode(4,INPUT_PULLUP); and don't do SD.begin(4); or that will put ...
- Sun Aug 07, 2016 10:52 pm
- Forum: EtherMega
- Topic: SD Intermittent Initialization Failure
- Replies: 1
- Views: 1686
There are a number of posts about intermittent SD initialization on cards or shields that contain both Ethernet chips (W5100) and SD features. Many suggestions are proposed including low capacity power sources (USB) needing external DC power, careful attention to correct CS pins, proper pull-ups on ...
I just received a new EtherTen board. The Wiznet W5100 ethernet chip looks to have about 25 of its pins bridged together with solder. Is this some strange manufacturing technique or is it a defect? I'd hate to waste everybody's time going back to the distributor if it is normal.