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interface bs2 with uALFAT MicroSD Board — Parallax Forums

interface bs2 with uALFAT MicroSD Board

whiz100whiz100 Posts: 13
edited 2009-09-02 05:41 in BASIC Stamp
I'm just started playing with the bs2 product and don't know anything about electronics, i'm a newbe.

I've bought the MicroSD Board product and want to interface it with the bs2. The device uses 3.5V and the bs2 is using 5V. Is there
something that will do the conversion from 5V to 3.5V and the reverse 3.5V to 5V. I'm thinking of using the SPI protocol.

Any information greatly received.




the uALFAT MicroSD Board can be found at
http://www.ghielectronics.com/product/102



thanks
Peter

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2009-09-02 05:37
    If you read the uALFAT MicroSD Board documentation, you'll see that all I/O pins are 5V tolerant. That means that you can connect them directly to 5V logic devices (like the Stamp) without any special precautions. You will need a 3.3V regulated supply voltage and most BS2 boards don't provide this. You'll need to use a LDO (low dropout voltage) 3.3V regulator to drop the 5V of the Stamp's supply to 3.3V. You can use the Propeller Demo Board or Protoboard schematics for examples of 3.3V regulators to use.
  • whiz100whiz100 Posts: 13
    edited 2009-09-02 05:41
    Thanks mike

    I'll give it a go.
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