The Zigduino is an Arduino-compatible microcontroller platform that integrates an 802.15.4 radio on the board. The radio can be configured to support any 802.15.4-based protocol, including ZigBee, Route Under MAC/6LoWPAN, and RF4CE. It uses a reverse polarity SMA connector (RP-SMA) for an external antenna. This allows the user to use nearly any existing 2.4 GHz antenna with it. The Zigduino runs on 3.3V, but all I/O pins are 5V compatible.
The Zigduino can be powered through the USB connection or with an external power supply. The power source with the highest voltage is selected automatically.
External power can be supplied via a wall wart or a battery. It can be connected with a 2.1mm center-positive plug inserted into the power jack. Alternately, external power can be connected through the GND and VIN pins of the POWER header.
The board will operate correctly on an input voltage between 6V and 30V. It will survive transients as large as -20V or +60V. However, higher supply voltages may cause excessive heat dissipation at higher current draws. The input voltage regulator has integral overtemperature protection, so you can't permanently damage the board this way. However, the board may not work correctly under these circumstances.
The power pins are as follows:
The ATmega128RFA1 has 128 KB of flash memory, of which 2 KB is occupied by the bootloader. It also has 16 KB of SRAM (the most of any Arduino-compatible board) and 4 KB of EEPROM, which can be accessed through the EEPROM library.
Input and Output
Each of the 14 digital pins of the Zigduino can be used as an input or output, using pinMode, digitalWrite, and digitalRead. Each pin operates at 3.3V and can source or sink 10 mA. Each also has an internal pullup, which is disabled by default. Each pin is protected against ±30V spikes and can tolerate continuous 5V input.
The six analog input pins, labeled A0 - A5, are likewise protected against ±30V spikes and can tolerate continuous 5V input. Each provides 10 bits of resolution and measures 0 - 1.8V. It is possible to change to a lower top voltage through use of the AREF pin and the analogReference function.
A key design goal of the Zigduino is maintaining compatibility with existing shields to the greatest extent possible. The ATmega128RFA1's peripherals are arranged slightly differently than the corresponding peripherals on the ATmega328 used in the stock Arduino. Therefore, in order to provide the desired shield compatibility, there are three solder jumpers provided on the back of the board. They function as follows:
The following additional special functions are available:
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