Controller module ATxmega128A1U v1.x

The main module of the HomeLab is a controller development board (controller board) equipped with a new generation of Atmel ATxmega128A1U USB-enabled microcontroller. In addition to the microcontroller, the board consists of several peripherals, voltage stabilizer, connectors, SD memory card slot. The controller board has the following features:

• ATxmega128A1U microcontroller
  • 128 kB flash-memory (program memory)
  • 2 kB EEPROM-memory
  • 8 kB SRAM-memory (data memory)
  • 2 x 8-channel 12-bit 2 MHz analog-digital converter(ADC)
  • 2 x 2-channel digital-analog converter (DAC)
  • 8 x 16-bit timer
  • Hardware USB 2.0 Full speed
  • 8 x UART interface
  • 4 x SPI interface (max. 16 MHz)
  • 4 x I2C/TWI interface
  • External interrupt on each pin.
• 16 MHz clock, 32 MHz Operating frequency
• Micro SD memory card slot
• Programmable status LED (PQ2) and power LED
• Programmable button S0 (PQ3) and reset (reset) button
• USB indicator LED (PQ0), USB power indicator LED (PQ1)
• Grouped AVR pins (1: ports C, D, E; 2: ports K, J, H; 3: ports A, B, F, Q)
• 2,1 mm power socket
• Automatic power switch (USB or external power supply)
• Built-in voltage stabilizer, with 3,3 V output
• Mini USB connection to program the microcontroller and to communicate with the computer

Robotic HomeLab Controller module

The module is equipped with a LDO voltage stabilizer (with low dropout). The module can be powered with a step down transformer with an output voltage which is greater than 6 volts and lower than 14 volts. In order to reduce power losses it is recommended to use power supply between 6-9V. The power LED signalizes a connected feed. The power LED must be lit, when connecting to the power. If it does not illuminate, the cause may be an inadequate power supply or a short circuited Controller module or a short circuit in other connected devices. Controller is equipped with fuses. If overcurrent occurs, the fuse blow and protect the most expensive components. Fuses can be changed, but it is recommended to do an experienced electronics experts. Fuses are small SMD components, and the user is difficult to replace them. The microcontroller can be programmed over USB, through the bootloader. To enter the bootloader, press and hold the button S0 on the Controller module, and then reset the controller.

The Controller module is equipped with a status LED, which is connected to the microcontroller pin PQ2. The status LED will light up, if the pin is set to low (logical 0). It is good to use as a simple indicator. Another LED is connected to the pin PQ0, but it is reserved for the USB connection, and the programmatic management is not recommended. Pin PQ1 is connected through the voltage divider to USB power. This pin can be used to read, if the USB cable is connected to the Controller module or not. The module is equipped with SD memory card slot, where it can be used as a standard microSD memory card. The memory card is connected to the microcontroller via the ISP interface and can be used to store data where data must be maintained even if the power supply is removed.

Kontrollermooduli ühendamisel teiste moodulite ning seadmetega tuleb esmalt veenduda, et Kontrollermooduli toide ei ole ühendatud. Ajal kui moodul on pingestatud, on ohtlik seadmeid ühendada. Mooduleid ja seadmeid tuleb omavahel ühendada ettevaatlikult ja liigset jõudu kasutamata. Vale käsitlemise korral võivad piikriba piigid kergesti kõveraks painduda. Programmeerimiseks ja nõrkvoolu (alla 500 mA) toiteks võib Kontrollermooduli ühendada ainult arvutiga, kasutades mini USB kaablit. Kui kasutusel on moodulid, mis vajavad summaarselt rohkem voolu kui 500 mA tuleb seadmete toiteks kasutada eraldi toiteallikat. Samuti tuleb eraldi toiteallikat kasutada juhul, kui soovitakse kasutada alalisvoolumootoreid, servo- või samm-mootoreid. Kui Kontrollermooduliga on ühendatud välise toiteallika pistik, lülitub moodul automaatselt USB toitelt välisele toitele.