I’m having issues with the SD Card on my Ambika, I scoured the forums for a solution, and it seems that everybody’s issues were solved by using the correct 4050N chip. I have already tried two of these - 74HC4050 - with no change. I scoped the SD Card slot and am seeing data and clock coming from the processor, but the SD card is only responding with slow high-low transitions. I have a few questions:
Should the SD Card Save/Load feature still function if the voicecards are not installed?
Would using an Atmega644 instead of Atmega644P cause this (or any other) issue?
Thanks for the help. Can you recommend anything else to try? I suppose it could be the sd card then - I’m using a 2GB Sandisk formatted FAT32 on a mac.
Are you sure it’s powered correctly?
The 3.3V regulator is providing 3.3V as it should.
Is it an SDHC card? I use a white label Sandisk.
It’s an older model 2GB SanDisk with a white label, it works without issue on my laptop, but maybe something’s wrong with it still? I will try to find another card to try. Could formatting it on a Mac cause the issue?
The older non SDHC are better, I seem to remember someone saying SDHC took longer to start and so the meant the card wasn’t always available after start up. You don’t need a big card anyway.
Mac format is fine, so long as its MBR and FAT.
My SD Card is this one:
Formatted MBR and FAT32 still get the error. I’ve replaced everything that could be the issue except the Atmega644 and the SD card slot, so I think I will do that next. I’ll just have to order those two things.
Try another card before replacing the card slot. Those AVR SD card implementations can be a little picky about the type and brand of card used.
Thanks @TheSlowGrowth That was it - I tried three more cards before I found a microsd card that would work. It was a 2GB Verbatim card that I had laying around - nothing special - which makes this issue more confusing.
Hi Guys ,
yes Ambika and also TuBika is a little sensitive with the SD ram Cards.
Some SD ram cards works , some not and some - sometimes -or not .
I had in the past good results with a Sandisk 4Gb (4) but than from one day to the other it doesn’t work.
I think it is the charge of the 74HC4050. Some works - some not.
The solution i have is to use a micro SD ram card ( Sandisk 4…8 Gb with an adapter ).
This works here without problems in a few TuBikas