Jakub Polonský of Kaktus Circuits designed this linear virtual ground with OPA548:
Virtual ground, also called “rail-splitter”, is a device that creates a midpoint, whose voltage is (plus + minus)/2 and is capable of both sinking and sourcing current.
Machinekit is a platform for machine control applications. It is based on LinuxCNC and can drive mills, lathes, 3D printers, laser cutters and more.
Machinekit can run on an Altera SoC which combines a hard silicon ARM core with a FPGA. Charles Steinkuehler has been working with the DE0-Nano development board from Terasic. MachineKit runs on the ARM core with the FPGA configured as a MesaNet card:
Charles designed a DB25 connected interface board, with pin-outs matching the P2 and P3 headers on a 5i25
cdsteinkuehler has shared the board on OSH Park:
Mesanet DB25 daughter-card adapter for Terasic DE0-Nano development board
jonmash designed this simple board with two ATTiny processors powered by a micro USB connector.
ATTiny-WidgetMicro USB power input to two ATTiny MCU’s. There are two different ATTinys on this board. An ATTiny84 and an ATTiny85. These MCUs are great because they can be used with no additional components. In fact, on this board, the only additional components are some filter capacitors for the power rail and a header for the programmer interface.
I have exposed an array of copper pads for every pin. This makes it easy to add LEDs or to wire to just about any sensor.
jonmash has shared the board on OSH Park:
Open Source AIS Transponder (Class B)This is the first ever (that I’m aware of) attempt at creating an open source AIS transponder
On the hardware side, the design is based on two Silicon Labs 4463 transceiver ICs and an STM32F302CBT6 ARM Cortex M4 microcontroller. One of the SiLabs ICs acts as a transceiver, while the other IC works as a receiver only. In receiver mode, each IC tunes to a different channel. When a transmission is scheduled, the ICs swap channels if the transceiver is not listening on the next transmit channel. This configuration may be construed as a violation of the AIS specification, but it makes for a much simpler PCB layout and negates the need for a 3-position RF switch.
There are two programs that need to be installed on the flash. The bootloader and the main application.
petera650 has shared the boards on OSH Park:
MyLab-odysseymonitor the status of your Smart electric drive EV with this RFduino CAN bus dongle and the Blynk app on your mobile phone:
/EDm_BLE
Hardware used:
The Espressif ESP32 features a 32-bit 240 MHz dual core processor with Wi-Fi and BLE. HydraBus created this shield for ESP-WROOM-32 or ESP-32S.
This shield can be used with or without HydraBus board, you can even cut HydraBus specific right side (on the line) to have a tiny ESP-WROOM-32 breakout board.
hydrabus has shared the board on OSH Park:
Benjamin Shockley designed this adorable Atmel SAMD21 dev board in the shape of Lego mini-figures!
This circuit board was designed as a fun project for a SAMD21E microcontroller based development board. The circuit design follows the recommended design from the SAMD Datasheet.
The design files are shared on GitHub:
bwshockley/Minifigure-SAMD21E
bwshockley has shared the board on OSH Park:
Carlos of GlowSaber wrote a great blog post on how we built an AVR programmer shield:
As I learned more about Arduino, I realized that it is possible to redesign the GlowSaber around the ATmega328 chip [..] I designed an Arduino Shield that can be used to burn the bootloader and upload programs to an ATmega328 chip.
Here’s a example of an ATmega328 in a custom board:
cvadillo shared the board on OSH Park:
davedarko wrote in his LED displays on Arduinos – a collection project log on hackaday.io:
With 4 of HP QDSP-6064 bubble displays in a drawer I felt ready to do something with them and the “Clocks for Social Good” – call on hackaday.com finally got me going
The design files are available on GitHub:
The board can be used to monitor the environment conditions, and store or transmit the data to a remote system for further processing.
Serge has shared the board on OSH Park:
OSH Park 