Mini Ultra Pro - Front

This is our low power rendition of the Arduino Zero based on the 32-bit ARM Cortex M0+ ATSAMD21G18A that provides plenty of processing power and peripherals at a reasonable cost. Mini Ultra Pro is the result of years of designing boards used for low power wireless sensor network applications in remote area. Many design aspects were based on improving the shortcomings of previous deployed projects like not having enough program flash memory, slow processing speed, unsuitable battery charger, limited range radio, unreliable data logging memory type and many more. We spent many hours and numerous board revision before actually releasing the final version. Here’s a short summary on the Mini Ultra Pro specifications:

  • Compatible with Arduino IDE using “Arduino/Genuino Zero (Native USB Port)” as the board option
  • Microcontroller – ATSAMD21G18A-AU
  • Clock – 48 MHz
  • Operating voltage – 3.3 V
  • Low quiescent current (1.6 μA) on-board 3.3 V 250 mA low dropout regulator
  • Ultra low power – Minimum 20.0 μA in sleep mode (known as standby mode on ATSAMD21G18A-AU) with a 4.2 V Li-Ion/Li-Pol battery as power source
  • External DC source range – 5 – 10.5 V (over voltage protection up to 28 V)
  • Battery charging management:
    • Power path management for proper charging process and load balancing
    • 400 mA battery charging current
    • 2 indicator LED for power good and charging process indication
  • Suitable for battery operation (3.6 V Lithium-Ion/Polymer)
  • Radio transceiver module options:
    • RFM95W 20 dBm long range LoRa radio module (915MHz or 868MHz):
      • Tested range with our 5 dBi antenna in semi urban area of 8 km (SF = 12, BW = 125 kHz, power = 20 dBm, frequency = 915MHz)
    • RFM69HCW 20 dBm FSK radio module (915MHz or 868MHz):
      • Tested range with our 5 dBi antenna in semi urban area of 1 km
    • Uses the multi platform RadioHead Packet Radio library for embedded microprocessors
  • On-board 2 MB (16 Mbit) serial flash for data logging
  • On-chip RTC with calendar support (using the RTCZero library)
  • Indicator LED connected to digital pin 13 through a MOSFET
  • 500 mA fuse for USB port over current protection
  • USB micro connector with 4 through hole pegs for reliability
  • JST PH 2.0 mm battery connector for Li-Ion/Li-Pol batteries
  • Side reset tact switch for easy access
  • Native USB serial for code upload
  • 10-pin 1.27 mm pitch for ARM Cortex SWD
  • 900 mil in between 2 breakout headers – suitable for breadboard usage
  • Dimension – 25.4 mm x 55.88 mm (1.0″ x 2.2″) (without the SMA connector)