Here is the SD card module I am using:
Here is the SD card I am using:
I have not tried a formatter at all yet, and I am going to try the one you suggested and let you know how it turns out.
I understand the very basic fundamentals of amps and voltage, essentially that voltage is volume while current is the the rate of its flow. I am a total newbie at circuitry though since my normal forte is biochemistry. This is totally granted that I am self taught so there are going to be a lot of holes in my knowledge.
No, voltage is a pushing force that pushes current through a circuit.
I used to lecture, for 21 years, in Physics at a uk university to undergraduate students and they all knew the fundamentals of voltage and current by the time I got them in the second and third years.
I guess I knew less than I thought. I just finished a video for beginners circuitry by Math and Science on Youtube, I understand where you were coming from now, and how I got confused. Current is the rate of which the charge of the voltage is flowing. Im glad you pointed that out, and I am going to keep learning so I can get better.
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The sd module and card look like good choices. You should be able to get them working with the UNO.
Thank you, I am going to format the SD to see if that works. Fingers crossed 
The Arduino Uno I am working with is capable of delivering current up to 200 mA.
I have formatted the card with this given software, and have noticed no change. I still receive error messages "Initializing SD card...Card failed to initialize, or not present". The Arduino is capable of delivering the 200 mA necessary for all of the solenoids (even though I am only testing on one), so I don't think that its a power supply issue.
Thank you for this advice though this is very good to know for the future.
Do you have any suggestions for why It wont work on either the example SD.h library sketch or the current code?
Here is the testing schematic for Arduino and SD card module (It should be noted that I have tried with and without the resistor for MISO pin connection to Arduino Uno):
No resistor is needed. There are level shifters on the board.
Did you format the card FAT 32?
What do you see if you put the card in a computer SD slot?
Do you have any suggestions for why It wont work on either the example SD.h library sketch or the current code?
No, I don't know, but stick with the library sketches for now.
Try to run the CardInfo library sketch.
I am on a Linux PC, so when I put the card in the slot, the image appears on the desktop for me to open and add/edit files, etc.. i formatted it as FAT 32 and didn't have any issues there.
I'm going to keep doing that now, and just try to focus on the solenoid valve code and not the SD card. Thank for the suggestions!
Solenoid valves are all working! I rewired the circuit to fit the schematic and with correct resistors (220 ohm) and transistors, along with code excluding SD card. I just made it so I manually input the sequence. (unfortunately couldn't figure that one out :/) but it works now that I have simplified the mechanism. I want to thank everyone so much for all your help! I have learned a lot on this project and thank you for your time and consideration.
Hi
Just for curiosity, did you manage to have your device working ?
Cheers
Karim
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