I2C Modifications for Sparkfun si4735 Radio Shield.

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After a couple of frustrating days trying to get the SPI interface to work, I ran across a post by Brett Wilson about using the shield with an I2C interface.

In his post he plugged the shield into a proto-board.  I wanted to keep it attached to my FezPanda (.NET Micro, Arduino clone).

The attached PDF details the hardware mods to use the shield with the I2C interface.    I will post NETMF C# code soon.

 

i2c Modifications for Sparkfun si4735 shield.N8VHF

  • digital_archivist

    I am in your debt forever!

  • digital_archivist

    If I wanted to make your I2C 2-wire conversion without clipping pins (by using a breadboard, or a Go-Between shield), could you confirm wich signals are where?  So far, it looks like I’ll need:

    Shield pin -> destination
    2 -> INT
    3 -> n/c
    8 -> +3.3v
    9 -> reset
    10 -> SEN
    11 -> SDA
    12 -> n/c
    13 -> SCL

    On the Netduino board, member hanzibal points out that Shield pin 3 (GPO2) is connected to a pull-up resistor, which should disable I2C.  Did you have to cut the pull-up out of the circuit to get two-wire mode to work?

    Any other pins that I missed?

    Thanks again!