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September 2006, Issue 194

Multifuctional Wireless Alarm
Freescale Wireless Design Challenge 2005


by Carl Smith


StartSystem Overview Installation & Operation Garage Door Module Water Level Module Temperature Module Hardware Design Garage Door Sensor Water Level Sensor Temperature Sensor Software Design Improvements Peace of Mind Sources and PDF

WATER LEVEL MODULE

For the water level sensor module, you must program the network number and device number. The module blinks two LEDs to indicate that you must program the trip point. Press the S101 switch to start the trip point calibration.

LED1 blinks rapidly to indicate the level programming mode. The rate of blinking slows as the sensor tube submerges deeper in water. This enables you to test the sensor.

When dealing with a sump pump hole, where filling the hole with water during the calibration process isn’t practical, you can calibrate the sensor with a glass of water. Use a marker or a piece of tape to mark the desired depth on the sensor tube and then submerge it up to that point in the glass of water. Press S102 to set the trip point. You can then move the sensor and tube into the sump hole. Mount the tube so the marked point is at the level where an alarm is desired.