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ATmega328P Low-Power Arduino Compatible Controller Board

SKU: DFR0343

μHex is the first Arduino-compatible low-power controller, ideal for battery setups—a 210mAh CR2032 supports 60-day standby with PIR sensor SEN0171. Using Atmega 328, it has 14 GPIO & 7 power ports (4 controllable) for most projects.

Front of μHex low power controller with gold pins and black circuitry.-DFRobot product sku:DFR0343 image.

Downloadable Resources

  • Docs
  • Tech Specs

    • Specification

    Parameter Details
    Microcontroller ATmega328P （board type: Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ ATmega328）
    Operating Voltage 2.7 - 5V
    Clock Frequency 8MHz （RC）
    Sleep Current 0.12uA@3V3， 0.16uA@5V （watchdog OFF）
    Flash 32 KB （ 0.5KB used by bootloader)
    SRAM 2 KB
    EEPROM 1 KB
    Digital I/O Pins 14 (PWM: 3,5,9,10,11)
    Analog I/O Pins 6
    UART Interface 1
    I2C Interface 1
    Interrupt interface 2
    Power in Port 1
    Power out Port 6 (4 of them are controllable power port)
    Maximum Current from Controllable Power out 2A
    Dimension 28 x 31 x 2.3 (mm)
    Weight 10g

    Pinout

    uhex pinout

    Silk-screen Digital Interface PWM Interface Analog Interface Proprietary Function
    RX 0 Serial
    TX 1
    2 2 INT0
    3 3 3 INT1
    5 5 5
    9 9 9
    10 10 10
    11 11 11
    A0 A0 A0
    A1 A1 A1
    A2 A2 A2
    A3 A3 A3
    SDA SDA A4 I2C
    SCL SCL A5
    DTR DTR
    + VCC
    - GND
    ⊕ Controllable power port

    FAQ

    • Is PB6 and PB7 broken out anywhere? Would be nice to be able to add 32,768kHz crystal.

      On the backside of the µHex, there are 6 solder pads, and two through holes, near the VIN and GND. What are they for? I can't find any documentation on them.

    • What is the image on the back of uHex？

      It is Chinese word '茶 cha' meaning 'Tea '.

    • Why I can't see any crystal oscillator on the module?
      uHex is using built-in 8M RC resource and completely meets the demands of general application.
    • Why silkscreen '2' is different from others？
      uHex is designed in the Chinese New Year. During the fesitival, people hang '福Fu' upside down on the door that mean blessing arriving at your home. Here I use the '2' stand for Fu. Fu means happiness.

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