Micro SD card module with Arduino Pro Mini
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- short_circuits
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- Joined: Wed Nov 30, 2022 12:18 pm
Micro SD card module with Arduino Pro Mini
I'm just building a simple datalogger. I bought the MicroSD card breakout (product 254) and a couple of 256Mb cards (https://www.adafruit.com/product/5251). I don't see any detailed specs on the 256Mb MicroSD cards, but there is general mention of the microSD cards being power hungry; " up to 100mA (or more)!" (from the tutorial https://learn.adafruit.com/adafruit-mic ... l/look-out ); this is a bit lacking as a specification, probably card specific, but there are no specs for this unbranded card. The Arduino ProMini is a 5V version and has a 5V regulator rated at 150mA max; I was planning to power the microSD module from the ProMini 5V regulator. Does anyone know the specs on the 256Mb microSD card that Adafruit is selling? I suppose it will be write cycles that draw the most current. Are there detailed specs for this 256Mb microSD card? The card is unbranded.
- mikeysklar
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- Joined: Mon Aug 01, 2016 8:10 pm
Re: Micro SD card module with Arduino Pro Mini
The current draw of the SD Card will likely be less than 40mA in SPI mode. Especially with the low SPI speed of the Arduino Pro mini.
The size of your card can be an issue. What filesystem were you going to use? If it is FAT32 you will be limited to a 32GB card.
The size of your card can be an issue. What filesystem were you going to use? If it is FAT32 you will be limited to a 32GB card.
- short_circuits
- Posts: 4
- Joined: Wed Nov 30, 2022 12:18 pm
Re: Micro SD card module with Arduino Pro Mini
Thanks so much for this information. I do wish Adafruit had datasheets for these cards but, in the end, I just want it to work and not smoke these old ProMinis. I just have these 256MB cards I got from Adafruit.
I can't believe this! There can't be more than one Mikey Sklar in this business! I saw videos of you sticking microchips in your hand years ago, and other crazy stuff you posted. You're a legend! Thanks bro. Best!
I can't believe this! There can't be more than one Mikey Sklar in this business! I saw videos of you sticking microchips in your hand years ago, and other crazy stuff you posted. You're a legend! Thanks bro. Best!
- mikeysklar
- Posts: 14182
- Joined: Mon Aug 01, 2016 8:10 pm
Re: Micro SD card module with Arduino Pro Mini
You might be able to find a data sheet. What does it say below the sticker?
You have a good memory. That is the first time I've been outed in the forums.
You have a good memory. That is the first time I've been outed in the forums.
- short_circuits
- Posts: 4
- Joined: Wed Nov 30, 2022 12:18 pm
Re: Micro SD card module with Arduino Pro Mini
Thanks for that tip. I'm 71 and a good candidate for a Jitterbug phone - didn't even see that lazer etched code - but, with my dissecting microscope, I found this under the reflective sticker >> AOFCAM2108AC
I searched this, found one image that shows this on the back of a MicroSD card, but I'm not hitting any manufacturer ID, info or data sheets. Does this code reveal anything to you?
I would just like to know the peak currents drawn by the card. I like to know, plan. I'm so over the "smoke test" phase of electronics. (grumbling.... seems Adafruit could do a bit better here... This IS constructive!!!!)
Thanks again!
I searched this, found one image that shows this on the back of a MicroSD card, but I'm not hitting any manufacturer ID, info or data sheets. Does this code reveal anything to you?
I would just like to know the peak currents drawn by the card. I like to know, plan. I'm so over the "smoke test" phase of electronics. (grumbling.... seems Adafruit could do a bit better here... This IS constructive!!!!)
Thanks again!
- mikeysklar
- Posts: 14182
- Joined: Mon Aug 01, 2016 8:10 pm
Re: Micro SD card module with Arduino Pro Mini
I'm not able to find anything of value based on the part number you were able to locate.
I did look a the spec for SD cards. 100mA is the max draw for SPI mode. This is based on the 2013 standard so a reasonable time period close to when this size card was common.
https://academy.cba.mit.edu/classes/net ... /SD/SD.pdf
I did look a the spec for SD cards. 100mA is the max draw for SPI mode. This is based on the 2013 standard so a reasonable time period close to when this size card was common.
https://academy.cba.mit.edu/classes/net ... /SD/SD.pdf
- short_circuits
- Posts: 4
- Joined: Wed Nov 30, 2022 12:18 pm
Re: Micro SD card module with Arduino Pro Mini
This document is extremely helpful. 99% of it not going to be immediately useful, but I do see the power max specs and it gives me great respect for the people writing the interface libraries.
Again, thank you for your help!
Again, thank you for your help!
Please be positive and constructive with your questions and comments.