Interfacing with 3.3V devices (input & output pins).

Interfacing with 3.3V devices (input & output pins).#45125

By monkiebsd - Fri Mar 21, 2008 9:38 am

- Fri Mar 21, 2008 9:38 am #45125

Hello everyone!

I need to connect my arduino to a 3.3V RF device (nordic nRF2401 to be exact). I read the interfacing 3.3V tutorial but I am still confused with one of the pin's that require input and output. The data1 pin needs to be both (on startup for configuration and then for data retrieval). If I use a diode and a pull up resistor when the data1 pin goes low on the nRF2401 the arduino pin will still stay high. How do I create a circuit so that the data1 pin can do both?

#45177

By PaulCo - Sat Mar 22, 2008 8:56 am

- Sat Mar 22, 2008 8:56 am #45177

where did you find the interfacing 3.3V tutorial
just starting out on these nordic nRF2401 myself..
paul

#45178

By leon_heller - Sat Mar 22, 2008 10:45 am

- Sat Mar 22, 2008 10:45 am #45178

Nordic has an app. note on using SPI with the nRF2401, which will make it easier to interface to the AVR - you can use the SPI hardware instead of bit-banging the interface. I haven't tried it (I now use the nRF24L01), but it should work.
Leon

Leon Heller
G1HSM

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