# RFM22B Problems

**URL:** <https://community.sparkfun.com/t/rfm22b-problems/19920>\
**Category:** Wireless & IoT\
**Created:** [March 15, 2011, 5:45pm UTC](https://community.sparkfun.com/t/rfm22b-problems/19920 "2011-03-15T17:45:26Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![jradcliffe](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@jradcliffe](https://community.sparkfun.com/u/jradcliffe)\
**Post date:** [March 15, 2011, 5:45pm UTC](https://community.sparkfun.com/t/rfm22b-problems/19920/1 "2011-03-15T17:45:26Z")

</div>

Hello,

I am working with a RFM22B on a Breakout board hooked to a Duemilanove board, using the libraries from [http://www.open.com.au/mikem/arduino/RF22/](http://www.open.com.au/mikem/arduino/RF22/)

When loading the example (RF22\_snoop.pde), I get a “RF22 Init Failure”, more specifically when the init code reads the 0x00 register it has a null/empty value. I have verified that the pins are connected correctly, and there is 3.3 volts being delivered to the board. This setup worked 12 hours ago, and now fails the init. I would appreciate any steps that would help me troubleshoot this issue, which my guess is in the SPI communications.

D2 → IRQ

D10 → CSN

D11 → SDI

D12 → SDO

D13 → SCK

Thanks,

Jay

---

<div class="post-metadata">

**Author:** ![jradcliffe](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@jradcliffe](https://community.sparkfun.com/u/jradcliffe)\
**Post date:** [March 15, 2011, 10:17pm UTC](https://community.sparkfun.com/t/rfm22b-problems/19920/2 "2011-03-15T22:17:00Z")

</div>

After turning it off for a couple hours and going to lunch it worked. Maybe the board was just hungry.