ATtiny84 remote temperature sensor with RFM12B

I have been drooling over the Amtel’s ATtiny84 mcu ever since JCW released the JeeNode Micro few months ago. It is an amazing piece of art, you can basically have a single-chip micro controller that can do most of the tasks an Arduino can, it even has a in-built oscillator and can run at 8Mhz.  Sweet. Then I saw Nathan Chantrell’s article on building a remote temperature sensor using this same mcu and could not resist getting one myself. It would be a nice addition to my emoncms, so I was ordering a ATtiny84, a TMP36  and a RFM12B the next minute. In the mean time, I was getting ready for it by installing the necessary patches to the Arduino IDE to get it working with this mcu. I own a tinyUSB ISP programmer already, so I didn’t need to worry about programming the chip with an Arduino. So once I got the parts, I follwed strictly Nathan’s instructuions and couple hours later I had a remote temperature sensor that sends data to my emoncms every minute.

Here are some pictures

I am tempted to create a PCB for this project and power it from a coin cell battery, lest see how this will go. There is a I2C protocol library available for this mcu so I may expand the project with a I2C port so I may become a remote “anything” sensor given that you have I2C sensors for almost anything you can think of.

Let me know if you would be interested in such sensor PCB and that may become my next hobby project 🙂




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3 thoughts on “ATtiny84 remote temperature sensor with RFM12B

  1. Could you please tell me how you programmed the Attiny and what library you used for the RFM12B? I’m programming an attiny84 using my Arduino Uno as per this tutorial: And I’ve tried two different libraries for rfm12b (from JeeLabs and other from LowPowerLabs) but when I compile their example codes I get a lot of errors. I’ve run simple codes on my attiny and I’ve run the example codes on the Uno, so I know both things are working..just not together 🙁
    Please help?

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