SD cards add inexpensive persistent memory to your project, however the holder takes a great deal of board space. A smaller choice is the microSD flash format. MicroSD cards are compatible with routine SD cards, as well as many include a totally free adapter. We looked at four holders for our small web server. Which ought to you choose? checked out about our experience below.
Here’s a breakdown of the microSD card holders illustrated above:
Alps SCHA1B0100 $1.27 – Can you see pins with the holes in the very first holder? They ‘re difficult to see, as well as practically inaccessible. We didn’t discover this holder extremely helpful for prototyping.
JAE ST6S008V4AR1500 $1.46 – This is one more design with pins found at the front, however these are even more ahead for simpler access. It’s still going to be a pain to solder, prevent if possible.
SparkFun PRT-00127 $3.95 – Finally, a holder with pins at the back. This is a relatively easy-to-solder part, however it’s not ideal. The soldering tabs are extremely little as well as somewhat recessed under the shield. It’s likewise the most costly microSD holder we’ve seen. SparkFun has a Cadsoft Eagle footprint for this part in their library. We believe Molex 538-502702-0891 ($3.58) is most likely extremely similar. We utilized this holder with the small web server.
Alps SCHA2B0300 – $1.27 – The long pins along both sides of this holder are simple to solder. The holder is reversed, implying the card inserts upside-down. Reversed holders seem strange on an all surface install board, however they in shape well in through-hole designs. There’s no Eagle footprint yet, however we’ll send an SCHA2B0300 to the very first person who makes one; here’s the datasheet (pdf).
Check out our previous parts posts: 0.1uF decoupling capacitors, the LM317 adjustable regulator, as well as tactile switches.