The Gecko system is designed to be compatible with the Arduino Mega 2560 in most respects.
|Gecko Arduino compatibility|
Obviously the Gecko is not physically compatible with the Arduinos Mega, however it will accept Duemilanove shields
Some differences are...
LED13 - On the Gecko this signal is buffered before driving the LED, therefore you do not need to consider any loading on this signal.
Voltage regulator - The Gecko can accept a VIN of 30 volts with no heat issues. At the other end a minimum of 8v is recommended.
USB - The Gecko uses an FTDI FT232 chip.
PWM - The Gecko brings all 15 hardware PWM signals out to connectors.
I2C - SDA and SCK connected to the outside world through a bus buffer.
DIGITAL IO - The Gecko has 7 fewer available digital IO signals, however all 47 are current limited and hardened to withstand ±30 volts.
MILLIS - A genuine 1mS counter, RTC-driven with no missed counts.
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