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Embedded Systems

The blog

Our Solutions

Solution #1 : The Bag

measure + contain (~5mL) → contain (~2.5L)

Base

a bag that expands/contracts with the presence of liquid that can hold 3-5mL of liquid

Sensor

piezoelectric sensor placed on each side of the bag crease to measure fullness

How It Works

Patient → 3-5mL bag → 2.5L bag

Main Issue

the bag is very small, so accurately measuring, filling, and draining the bag is an obstacle


Solution #2 : The Ultrasonic Reservoir

measure + contain (~2.5L)

Base

a plastic container with cross divides

Sensor

ultrasonic distance sensors placed over the top of each divide

How It Works

the sensors measure the depth of liquid in each column so we can calculate the volume

Main Issue

the ultrasonic distance sensors that we have used are not terribly accurate and do not guarantee sensing distance to mediums like liquid


Solution #3 : The Pressure Reservoir

measure + contain (~2.5L)

Base

a plastic container with cross divides

Sensor

pressure sensors placed at the bottom of each column

How It Works

we measure the amount of pressure put on the sensors by the liquid in each column and we calculate the volume based on density

Main Issue

the pressure sensor is built to handle large changes in pressure, not incremental changes like that of ±5mL


Solution #4 : The eTape Reservoir

measure + contain (~2.5L)

Base

a plastic container with cross divides

Sensor

eTape Liquid Level Sensors placed at the back of each column

How It Works

the eTape sensors tell the height of liquid in the columns based on the pressure to the sensor, which we can use to calculate volume

Main Issue

the first inch of liquid doesn't change the resistance value of the sensor

Phillip TrentComment