hi am nisha i would like to get details on wireless water level indicator without microcontroller circuit. i am living at rajkot and i studied in atmiya college and now i am doing this project so i need help on how this project is work.

Even though more than 70% of Earth’s surface is covered with water, only 3% of that water is useful for survival of life. Hence, efficient storage and usage of water is of utmost priority.

Generally, water is stored in overhead tanks or underground tanks. A simple water level indicator circuit is presented in this article to indicate the level of water in a tank and also alarm when the tank is full.

The aim of this project is to make a water level detecting alarm with simple and low cost hardware without compromising on the performance of the device.

First let us build a water level alarm using simple 555 timer.

The circuit uses a 555 timer in astable mode with R1=220 ohms, R2= 150 ohms and C1=1 uF. The frequency of the given astable circuit is around 1.18 KHz.

The two probes which are shown in the circuit should be kept at the high level for the water. The distance between the probes should be less than a few centimetres to ensure that the conduction between the probes will take place when water is touched to these probes.

When the water level rises to the height of the probes, then the 555 circuit will get enabled and the output of the 555 timer produces a square wave output with a frequency of about 1.18Khz. This output is given to the mini loudspeaker which then beeps at an audio frequency of 1.18KHz.

The logic Implemented in this circuit is, 555 timer is enabled when its reset pin is connected to logic high. But initially it is connected to ground. When the water level is maximum this pin is enabled and this drives the 555 timer into astable mode. Learn more about 555 timer.
The article explains how to make an RF remote control circuit using ready-made RF modules and without incorporating microcontroler ICs.

With the easy availability of RF modules today making an RF remote control has become a childs play.

It's all about procuring the RF modules ready made from the market by spending a few bucks and configuring them together for the intended results.

Here I'll show you how to make an approximately 100 meter range RF remote control circuit using RF modules, without the help of any microcontroller stage.

To begin this you will have to procure the following readymade RF modules and the respective encoder and decoder chips, for the present project we use the HOLTEKs modules: