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Use 3 pins of Arduino to control multiple 7-segment display with 4094 8-bit shift register. It has been tested on HEF4094B CD4094B CD4094BM and MC74HCT4094A.
CANopen driver framework for ROS (http://wiki.ros.org/ros_canopen)
PCB consist of ESP8266 for controlling Addressable LED Strip WS2812/WS2813, minimized to the smallest size.
Pre-sheet of USB to TTL converter, easy to build new project without create whole new USB-TTL schematics.