Which sensing technique or sensor to use for detecting smallest amount of water Inside a tunnel(Humid Environment).With ultra low power consumption up to 12 microwatts. The sensor has to be integrated with a Wireless Sensor Network.
Dear Manav,
would the wsn have an analog to digital converter ADC and you want merely an analog moisture sensor or do you want an intelligent sensor that can be digitally connected to the microcontroller of the wsn?
Best wishes
Dear Mr. Zekry, thank you four response, I have two microcontrollers embeeded in my design and one of them is used to convert analog to digital conversion. I just want to detect water inside such conitions where moisture could already be present. Just assuming to detect water leakage from a wall or a pillar inside a tunnel.
Dear Manav,
In order to reduce the energy consumption wile keeping the sensitivity high you may use either capacitive moisture sensor or you can use resistive moisture sensor while increasing its sampling interval. For example assume that the sensor works at 10 mA maximum. If you sample it with a duty of 1/1000 you reduce its power to 1/1000 of the continuous operation.
Best wishes
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