JeeNode Micro
The JeeNode Micro is the tiny brother of the JeeNode:
Note: software development and testing with the JeeNode Micro is considerably more complicated than a JeeNode/JeeLink, because it is not compatible with the ATmega328's used by the Arduino.
Specifications
The JeeNode Micro (JNµ) runs on an ATtiny84 MPU which has 8 Kb of flash memory, 512 bytes RAM, and 512 bytes EEPROM. The board includes the same RFM12B wireless module as JeeNodes and JeeLinks.
This unit can be programmed using the Arduino IDE, but it requires additional setup to be able to do so (see the Arduino-tiny project). Also, sketch uploading is performed via an ISP programmer, not FTDI.
In addition to supporting ratiometric analog inputs like the ATmega328 used on JeeNodes, the ATtiny84 includes support for differential ADC with optional 20x gain, which means it can also be used to measure much smaller voltages.
There is room for a number of headers, which can be used as up to 2 standard ports, i.e. the same 6-pin connections as on a JeeNode, suitable for connecting various plugs. The back of the board can accommodate an MCP1703 3.3V regulator and 2 extra caps (all SMD). These are normally omitted because the board has been designed for battery-powered use, and can be operated over a wide voltage range without regulation (1.8 .. 5V for the ATtiny, 2.2 .. 3.8 V for the RFM12B).
How to Get It
Pre-assembled units and boards will soon be available in the Shop.
Or create your own boards (see below for schematic PDF and EAGLE files).
Dimensions: 16 x 48 x 4 mm.
Everything is provided as open source, both hardware and software.
How to Build & Use It
The board comes pre-assembled, with the ATtiny and other components already soldered on (but without regulator).
The antenna can be a 1/4-wavelength piece of wire:
- for 433 MHz, use a 165 mm wire
- for 868 MHz, use a 82 mm wire
- for 915 MHz, use a 78 mm wire
See Also
The JeeNode and JeeLink are the more extensive versions, using an ATmega328 and compatible with standard Arduino boards.
Related Weblog Posts
- 2011-10-27 - AC current node prototype
