PiXtend V2 -L- Hardware Manual
6.3. PiXtend V2 -L- Microcontroller
PiXtend V2 -L- uses two Atmel / Microchip 8-bit RISC processors. The ATmega / ATtiny
series is extremely popular and widespread. Similar processors can be found, for example,
on Arduino boards and on our earlier products PiXtend V1.x and LED-Qube 5.
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The microcontroller performs a variety of tasks
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Control of digital outputs and relays
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Generation of servo and PWM signals
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Reading in analog and digital inputs
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Operation of the four GPIOs (as input, output or for temperature and humidity
sensors (DHT11 / 22 / AM2302)
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Signal processing and data processing
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Watchdog functionality and voltage monitoring (brownout detection), data protection
layer with 16-bit CRC checksum
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Monitoring of the supply voltage and holding of retain data / persistent data
Raspberry Pi and PiXtend microcontrollers (ATmega324A) are interconnected via the
Serial Peripheral Interface (SPI) bus. The Raspberry Pi is the bus master, the PiXtend
microcontroller the slave. The ATtiny441 has no direct connection to the Raspberry Pi
computer, but only to the ATmega324A.
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Figure 50: PiXtend V2 -L- microcontroller
