power, as the previous one also works fine but adding the encoder and decoder function ICs make the project more reliable and take it to the next level where we can also use it to perform more functions which will be discussed in our future projects.

Transmitter Section:
At this time we have designed the transmitter circuit to reduce current consumption from the batteries as the transmitter circuit will be placed far away from the receiver or high above from the ground level therefore changing the batteries more often become a hassle and also increases the operating cost. So now the transmitter circuit only consumes 370uA current in the standby mode due to which the batteries will last for several months. The transmitter section is using a CMOS 7555 timer IC, HT-12E encoder IC, transmitter part of the RF module, four transistors and few other discrete components. The two probes shown in the circuit diagram should be placed at the required level of water, when the water touches the probes the transmitter sends the signals to the atmosphere for a preset time period i.e. five to ten minutes, this time period can also be increased or decreased by using a higher and lower value of capacitor Cx. The max range will be achieved by providing 12V to the transmitter circuit.

Receiver Section:
The receiver section is built using the HT-12D decoder IC, RF receiver part of the RF module, 555 timer IC, buzzer and few other discrete components. When the receiver section receives the signal from the transmitter it activates the buzzer circuit to produce beeps. The frequency of buzzer beeps can be adjusted with the 100K variable resistor.  
Note: This circuit is using same RF module that is used in the previous circuit
here: wireless water level indicator using RF module

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This is the enhanced version of the previous wireless water level indicator using RF module and without using microcontroller, the max transmitting range of the circuit is upto 100 meters. We have took further steps to make the circuit more reliable, stable and also designed to consume low
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Transmitter Section
Receiver Section