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Check this out a credit card sized business card and gaming console based on Arduino. It is only 1.6 mm thick (thickness of PCB) and all SMD components are fitted into milled cutouts made on the PCB.
Read moreWe have added a 500mA PTC fuse to our dual (5.0V/3.3V) power supply regular board in the new version. This power supply regulator board provides constant 3.3V and 5.0V outputs from an unregulated DC input (6.5-10V). The DC outputs are accessible through a 3-pin terminal block. It is small in size (1.9″X1.0″) and can be easily enclosed inside a project box along with the project circuit board. The board doesn’t have any ON/OFF switch, because it may not be useful if this board is enclosed inside the project box. We have included two through-hole pads on the board if you want
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Ralph Doncaster writes, Nrf24l01+ modules are a cheap and low-power option for MCU wireless communication. Libraries are available for Arduino, and for arduino compatible MCUs like the ATTiny85. Controlling the nrf modules usually requires power plus 5 pins – CE, CSN, SCK, MOSI, & MISO. With pin-limited MCUs like the ATtiny85, 5 pins is a lot to tie up. On something like the Digispark, with PB3 and PB4 hard-wired to USB+ and USB-, using the nrf24l01+ modules might seem impossible. Another issue is that although the nrf inputs are 5v tolerant, Vcc must be between 1.9 and 3.6V. I’ve designed
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RetroWatch is an open source project to let you make a smart watch using the Arduino platform. This instructable describes the details of this project in step by step. The hadware design is based on the Arduino Pro mini and the HC-06 Bluetooth module. Watch the RetroWatch in action in this video.
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I found this interesting post on EDN by Benabadji Noureddine about driving an HD44780-based LCD module serially through one wire. It receives the display data as well as power supply through the same single wire connected to the UART TX pin of the host microcontroller. The LCD module itself uses a PIC12F508 microcontroller that receives the serial data from the host MCU and transfers it to the LCD in 4-bit mode. The clever trick in this design is during idle condition, the UART TX output from the host MCU remains high, which is used to supply power to the PIC12F508 MCU and the LCD.
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