Description
This is our low power rendition of the Arduino Zero! We hit the limit (program flash, memory) on a custom board based on our beloved Mini Ultra 8 MHz board while doing a custom project for a client. As much as we want to make an ATMega2560 version of the Mini Ultra, the chip size (TQFP100) is just awfully too big for our liking and the price is unreasonable for an 8-bit microcontroller. In contrast, the 32-bit ARM Cortex M0+ ATSAMD21G18A provides plenty of processing power and peripherals at a reasonable cost. For the past 10 years, we have been actively involved in wireless sensor network and Mini Ultra Pro is the result of those hours and hours of developing what works in the field. The Mini Ultra Pro works great with our updated Arduino compatible low power library to allow flexible low power management of the board. This version comes WITH the radio transceiver module and SMA assembled. 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
- RFM95W 20 dBm long range LoRa radio module (915MHz or 868MHz):
- 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)
- RoHS compliant – Yes
- Comes with a free 2.54 mm 1×40 pin header
- Antenna not included
Documentation:
Robert (verified owner) –
Excellent quality board. Has built in flash storage chip, and a higher current battery charger chip than the Adafruit Feather. (Not to knock Adafruit, as they have done well for me with good service.)
I’ve received personal, and excellent service, from the owner concerning code issues (radio manufacture not specifying limits; not my issue or his.)
Overall, a great board that works, and personal service from someone that responds quickly and genuinely cares. This combination is rare these days.
tom lafleur (verified owner) –
Excellent supplier, boards are high quality and provides quick first rate service. To say it again, Excellent!
jagath ekanayake –
I am happy to confirm the first two reviews. Excellent service and great quality broads ( I used only Ultra mini pro). First I purchased samples and so impressed and purchased 50 of them and again 50 boards with minor customization. Great help over all. Professional service. Wish him well !