TK-Labs in Korea have fabricated their own LattePanda stackable expansion shield. The expansion shield stacks on top of the LattePanda to unlock and enhance an array of features.
This is the second iteration of the design, and development is ongoing. Firmware is working but still under development.
Various new functions have been implemented using a STM32F373 MCU, including 16bit delta sigma ADC, 12bit ADC, 12bit DAC, DIgital Input, Digital Output, RTC, USB-VCP and Rs232c
A 5V@4A step down regulator is built in, so that the LattePanda is adequately powered. The underside of the board has a set of female headers that mate with the LattePanda’s CN2 power headers. A set of male headers on the underside of the board also mate with the LattePanda’s female UART headers to access the Cherrytrail chip.
Basic circuit tests and functional tests have been completed and a GUI for the firmware and test program (LABVIEW) has been created for the operation of the STM32F373 MCU.
The protocol for communication is a control protocol created by Mavlink to support various development languages.
There is a USB type A female connector to connect the LattePanda’s audio jack to the audio amplifier built in to the shield and the USB-VCP.
10V~36V DC Barrel Jack Input (direct to LattePanda CN2 headers)
The board and firmware will be released later as open source and open hardware. Designs for this board are available under the Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 international license.
Original Blog Post
The original TK-Labs blog post can be found here (Korean). A machine translated English version can be found here. Find TKLabs on Google+