Water Detection Alarm Device

water detection alarm device

This diagram shows a device used for water detection, when the probes come in contact with water, the alarm sounds. It consists of only 5 components that are easily available in the market.The IC CD4047 is CMOS-based, so pay attention to the static while installing it. Probes can be any two metal surfaces. It is best to install the screws on the edges of the PCB board, this way you get a rack that holds the entire device above water and you can use any two screws as probes. Setting the alarm is to touch the probes by hand or place the probes of the device in the water and adjust the P1 potentiometer until you  get a satisfactory sound from the piezo speaker.

Components Detail

  • CD 4047 IC
  • Resistor 2M (1)
  • Resistor 10k (potentiometer)
  • Capacitor 0.015uf (1)
  • Pizo (1)
  • 9 volts battery
  • Battery Cap
  • 2 pieces of copper wire as sensor

CD4047 Pin Description4047 IC pins Out

As mentioned earlier there are 14 pins on the IC interface with every pin is used with a specific purpose. The given below table shows the pin description of each pin.It is a CMOS very Low Power mono stable/stable multi-vibrator mainly used for converting DC current signal to AC signal.

 

 

Pin description 

Pin# Pin Name Pin Description
1
C
Connected to an external capacitor
2
R
Connected to an external resistor
3
R-C Common
Common pin for establishing a connection with resistor and capacitor
4 A stable’ Must be kept low when used in a-stable mode
5 A stable Must be kept high when used in a stable mode
6 -Trigger High to Low transition will be given to this pin when used in Mono-stable mode
7 Vss Ground Pin
8 +Trigger Low to high transition will be given to this pin when used in Mono-stable mode
9 EXT Reset External reset triggers when a high pulse is provided to this pin, resetting the output Q to low and Q’ to high
10 Q Generates high output
11 Q’ It is an inverse output of pin 10, producing a low output
12 Re-trigger This pin is used in Mono-stable mode for simultaneously re-triggering +trigger and –trigger pin
13 Osc Out
Generate oscillated output
14 Vdd Voltage supply pin

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