555 IC Water Level Sensor/Detector Alarm


Posted on Feb 7, 2014

This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 timer is used as astable oscillator in this circuit. When this circuit is under dry conditions the transistor will be fully off because it have no bias current. when the probes get wet, a sma


555 IC Water Level Sensor/Detector Alarm
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ll current flows between emitter and base then the transistor switches on. The 555 osillator is enabled to sound because of a larger current flows in the collector circuit. Here is the schematic diagram of the circuit: An On/Off switch is provided and use a non-reactive metal for the probe contacts. We can use Gold or silver plated contacts from an old relay. But, a cheap alternative is to wire alternate copper strips from a piece of veroboard. These will eventually oxidize over, but the higher impedance caused by oxidization is not important because very little current is flowing in the base circuit. the transistor is in emitter follower, so no base resistor is necessary. The current limit being the impedance at the emitter. [Circuit`s schematic diagram source: This schematic diagram shows a water level sensor/detector/monitor circuit. An alarm is also featured in this circuit. Any fluid with a resistance under 900K between the maximum separation distance of the probes will trigger this circuit. A 4050B CMOS hex Continue reading †’. This water level sensor (detector) circuit uses a standard NAND logic gate to produce oscillation and to detect the water level. Oscillation is included inside this circuit to provide alternating current (AC) source for probe electrodes, to achieve a corrosion Continue reading †’. The MAXQ3210 ia a powerful RISC microcontroller. This device have features and capabilities to make it compatible...




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