The shape is a bit different, but both boards work as intended. Both have LEDs, but the Gravitech LED is on whenever a card is inserted (I think using the socket’s mechanical card detect switch) and the Adafruit LED blinks while data is transferred to/from the card, which I think is the more useful function. Both have “push/push” type sockets (to release card, push in, it clicks and springs back out). They are from different vendors; the Gravitech sockets seemed to have a bit more friction and were more sticky overall, and tend to grab on to the cards rather than release them cleanly, but they seem to improve a bit after a few cycles.
Looks like we did good, our LEDs blink on data transfer and our sockets release cleanly out of the box 🙂 The SD sockets are always hit or miss depending on the maker.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Biohacking — Focus Building Meditation with Michael Taft
Python for Microcontrollers — Consumers Should Immediately… Python the Circuit! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
If I could also just add an observation of mounting holes on the Adafruit board. I can’t imagine trying to rig a push/push uSD without them. 🙂
Hey, that post looks familiar! 🙂 I’m not intentionally doing a comparison series, it’s just by chance I had similar boards from different vendors, and thought the info would be helpful. Another plus, if you’re connecting to an Arduino, is that the SPI pinout on the AF board is straight-across to Arduino digital pins 10-13. And the AF board has more finger-friendly rounded corners. And the I/O direction is indicated on silkscreen; nicely done.
thanks jbeale! you should keep it up, these are great!
Another possible subject is comparison of microSD cards for moderate-speed (few kB/sec) data logging via SPI. Some work and some don’t, and published SD benchmarks use 4-bit mode, not SPI mode. I think the problem there is mfr sourcing. If Brand A is working now, it might not the next time you buy it… http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=106771&start=0
“…bought a handful of different cards to benchmark over the SPI interface. There were huge variations between cards. Problem was, the cards kept changing, so we could never buy the same card for more than a few months.”