This Application Note from Microchip provides a reference design for building a non-invasive blood pressure meter using the PIC24FJ128GC010 microcontroller and MCP6N11 instrumentation amplifier.
A digital blood pressure meter measures systolic and diastolic pressures by oscillometric detection. Microchip’s digital blood pressure meter demo can measure blood pressure and pulse rate during inflation. The Measurement While Inflating (MWI) principle
reduces overall measuring time, which in turn reduces discomfort caused by the pressure in the cuff.
PIC-based blood pressure meter
Check out this DIY LED matrix pong game, which is Arduio-controlled and uses a rotary encoder as input device and two 8×8 bi-color LED matrix boards for game display. The LED matrix displays are driven by MAX7219 chips.
Arduino pong game
If you like gardening but hate to keep up with the daily routines of watering the plants, you might be interested in this Arduino controlled gardening assistant, which monitors and controls the soil humidity and lighting level inside an indoor garden to ensure that the plants have favorable conditions for healthy growth.
Indoor garden automation
This fully-open digital wrist watch is designed by a group of employees at CERN as a special present for one of their retiring colleagues who likes hiking and timing. The watch features multiple sensor units including GPS, pressure sensor, 3D-accelerometer, compass, and ambient light sensor. A 128×128 pixels LCD with backlight feature is used for front display. The watch also provides a MicroSD card slot for storage. Powered by a 500 mAh Lithium-ion battery, the project uses Silicon Labs’ EFM32 Giant Gecko ARM® Cortex®-M3 based 32-bit microcontroller as its brain.
F*watch: Open-source wrist watch
Ajoy Raman’s new project on Instructable is about making a low-cost hand-held tweezers to meause R, L, C, and Z (complex impedance). The project uses the TI’s TMS320F28027 micro-controller, an 8-port-analog-switch ADG714 from Analog Devices and the MCP6022 rail-to-rail dual Opamp IC. The ZLRC measurements are sent to a PC through an USB port using an USB-to-TTL converter. He also developed a GUI application for the PC end to display the results.
USB tweezers for ZRLC measurements