The Monitor Of Oxygenation and Blood (MOB) is a machine that monitors your heart rate and oxygenation. When your oxygenation is ok it blinks red in sync with your heart rate and when your oxygenation is bad it blinks blue. One group who would use this are patients at a hospital. Here it is at work:
In the hospital, the use of lights instead of sound helps to localize the notification to the appropriate patient and makes for a less stressful environment. Another scenario is home health care, where the lights allow for a less obtrusive and quicker check than having to go close enough to read the details from the LCD display.
We prototyped the project by building an extremely simple circuit using the RGB LED and with potentiometers to adjust the color. We took photos using several separated layers of parchment paper to diffuse the light. We then overlayed those photos with photos of an off-the-shelf oxygenation meter. Here is the prototype circuit breadboarded:
The real circuit would use pulse width modulation with an RC circuit to adjust the color.
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