Overview
The Water Level Reference design continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4, 8–pin microcontroller. This system uses very few components, reducing the overall system cost. This allows for a solution to compete with a mechanical switch for water level detection but also offer additional applications such as monitoring water flow for leak detection, and the other applications for smart washing machines.
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Features
- Demonstrate Water Level Monitor plus additional features such as water flow monitoring and leak
- Pressure Sensor - MPXM2010
- MPAK Package
- Sensitivity 2.5 mV / kPa
- Pressure Rating 10kPa (Max)
- Microprocessor MC68HC908QT4
- 40K Bytes of in-application reprogrammable Flash and 128 Bytes of RAM
- High performance, easy to use, HC08 CPU
- 4 Channel 8-bit analog to digital converter
- 8-pin DIP or SOIC packages
Design Considerations
Media
- Isolate pressure sensor from water by using a head tube
Accuracy
- To prevent overflow and control consumption of water
- Auto-zeroing concept can eliminate offset errors
- Tank/tub diameter is irrelevant, the important part is to have an accuracte look up table to correlate water height versus pressure
