README.md
arm-bmw-hw

The ARM Bare Metal Widget (arm-bmw) is an open hardware Cortex-M0 development board with a focus on battery power, non-volatile storage, and debuggability. It is suitable as a battery-powered data logger or a general purpose embedded controller.

The arm-bmw features a small 70 x 43mm footprint, lithium polymer battery and USB power selection, a lithium polymer battery charger, a 2-megabyte Flash memory for data storage, a basic user interface, an FTDI-cable compatible UART header, JTAG-SWD for flashing and debugging, and 16 assorted I/O for connectivity. Its BOM totals to under $15 USD. The arm-bmw is open hardware (CC-BY-4.0 licensed) and open source (MIT licensed).

Order 3 PCBs from <![CDATA[]]>OSH Park<![CDATA[]]> for $23.30 ($7.77 per board): <![CDATA[]]>https://oshpark.com/shared_projects/iBdyoHro<![CDATA[]]>

Photos

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Specifications


<![CDATA[]]>NXP LPC1114FDH28<![CDATA[]]> 32-bit Cortex-M0 microcontroller


Up to 50MHz CPU
12MHz on-chip RC oscillator
32kB Flash, 8kB SRAM
6-ch ADC, I2C, SPI, UART, PWM, Capture

On-board 16-MBit (2-Mbyte) SPI Flash Memory (S25FL216K)
Power


USB (mini-B connector) or LiPo Battery powered
3-position power switch to select power between OFF, BAT, USB
On-board LiPo Battery Charger (<![CDATA[]]>MCP73831T<![CDATA[]]>)
Power LED, Charge LED

User Interface


On-board I2C I/O expander to save microcontroller I/Os (<![CDATA[]]>MCP23008<![CDATA[]]>)
4 LEDs
2 push buttons
2 DIP switches

Input/Output


16-pin 0.1" pitch I/O header with I2C, SPI, Analog, Digital and Power pins
JTAG <![CDATA[]]>Serial Wire Debug<![CDATA[]]> header for Flashing and Debug
UART header, 6-pin <![CDATA[]]>TTL-232R-3V3<![CDATA[]]> compatible

Board


<![CDATA[]]>Dangerous Prototypes SoB DP7043<![CDATA[]]> (70x43mm / 2.756x1.693in) footprint
4 mounting holes

Miscellaneous


Optional external crystal and load capacitor pads
Hand-solderable packages



See the datasheets section below for links to part datasheets.

Hardware Sources

Git: git clone https://github.com/vsergeev/arm-bmw-hw.git

GitHub: <![CDATA[]]>https://github.com/vsergeev/arm-bmw-hw<![CDATA[]]>

Software Sources

Git: git clone https://github.com/vsergeev/arm-bmw-sw.git

GitHub: <![CDATA[]]>https://github.com/vsergeev/arm-bmw-sw<![CDATA[]]>

The arm-bmw-sw project includes a testing suite to verify the correct operation of the UART, SPI, I2C, SPI Flash, I/O Expander, LEDs, and Buttons.

Details and Pinout

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