A device to apply and release pressure in a cuff wrapped around a limb, to ease pain.
Motor pump increases pressure in cuff
When pressure = blood pressure, blood flow stops => detected by microphone / stethoscope => used to know at what pressure to take systolic/diastolic reading. This is not needed for our device
Has a separate sensor to continuously measure pressure, connected with a T junction between the pump and the cuff.
Only increases and decreases pressure cyclically
There are leaks etc, so motor needs to keep running to maintain pressure Possibly use PID control
comes with a port for 2.5mm hose
https://robu.in/product/hx710b-air-pressure-0-40kpa-sensor-module/
https://www.electroschematics.com/pressure-sensor-guide/ - uses: https://github.com/bogde/HX711
https://forum.arduino.cc/t/using-hx710b-pressure-sensor/648374/3
Currently unavailable :(
Can harvest existing BP devices for the pump
To convert
Tutorial: https://youtu.be/ehxq8R4muGI
Explanation: https://www.monolithicpower.com/en/learning/mpscholar/power-electronics/dc-dc-converters/buck-boost-converters
(?Purchase Link)
Needs 12V power
https://www.fluidcontrols.co.uk/how-solenoid-valves-work/
https://www.iqsdirectory.com/articles/solenoid-valve/3-way-solenoid-valves.html
https://learn.adafruit.com/adafruit-2-8-and-3-2-color-tft-touchscreen-breakout-v2
https://randomnerdtutorials.com/guide-to-1-8-tft-display-with-arduino/
https://en.wikipedia.org/wiki/TFT_LCD: enlightening
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Use processing, later use a display, and possibly a UI library either physics buttons or touchscreen
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Pressure relief valve with a solenoid Also one for user in emergency
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Powered by wall wart + rechargeable battery (newer arduino’s come with battery management system?)
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User interface: On, off, change program Program has ramp up time, max pressure steady time, ramp down time, no of cycles