Water Level Sensor with ATtiny85 and Buzzer Indicator

Contents hide

1 Introduction

2 Hardware Overview of Water Level Sensor

3 Technical Specifications of Sensor

4 Hardware Required

5 Circuit Diagram

6 Arduino Code

7 Working Explanation

8 Code Explanation

9 Application and Uses

Introduction

A water level indicator, as the name implies, is a system that signals specific levels of water or other liquid, and it is used in a variety of applications. It may be used to measure the water level in the tank of a boiler in industries, and it can also be used to check the amount of water that crops require in agriculture. In conclusion, we may adopt this fundamental circuit in several situations. The level of water is detected via water level sensors. in those circuits. Industry, chemical plants, and other liquid storage systems all use water level sensors. So, in this tutorial, we are going to make Water Level Sensor with ATtiny85 and Buzzer Indicator.

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2$ PCB Prototype

Hardware Overview of Water Level Sensor

There are ten exposed copper traces on the sensor, five of them are power traces and five are sensing traces. These traces are linked so that per two power traces there is one sensory trace. When submerged, these traces are usually not linked but are bridged by water.

Technical Specifications of Sensor

Operating voltage: DC: 3-5V
Operating current: less than 20mA
Sensor Type: Analog
Detection Area: 40mmx16mm
Operating temperature: 10℃-30℃
Humidity: 10% -90% non-condensing

Hardware Required

S.no	Component	Value	Qty
1.	IC	Attiny85	1
2.	Water level Sensor	–	1
3.	Buzzer	–	1
4.	Battery	–	1

Circuit Diagram

Arduino Code

#define sensorPin A3
#define buzzer 4
// Value for storing water level
int val = 0;

void setup() {
pinMode(buzzer, OUTPUT);
digitalWrite(buzzer,LOW);
}

void loop() {

  int level = analogRead(sensorPin);
  if(level>450)
  {
  digitalWrite(buzzer,HIGH); 
  }
  else
  {
  digitalWrite(buzzer,LOW);   
  }
  delay(1000);
}

Working Explanation

In this Water Level Sensor with ATtiny85, by following the schematic and uploading the above-mentioned code to your controller IC when the module detects readings that are higher than the set threshold, it will send them to the controller. As a result, the buzzer starts to beep.

The resistance and the levels of water are inversely proportional to each other. at higher levels of water, the conductivity of the sensor gets high. Hence, the resistance gets low. In the same vein, at the lower levels, the conductivity is low. And the resistance is higher. According to this resistance, the sensor estimates the voltage, which then helps to measure the water level.

Code Explanation

First, define the controller pin that is connected with the water level sensor. Also, define the controller pin which is connected to the buzzer. After that define the variable val stores the integer water level.
In the void setup, declare the buzzer as output by using the pinMode function. Also, for the initial state, set the buzzer value low using the digitalWrite( ) function.
In the void loop, define the variable level that stores the integer readings coming from the sensor. To get the readings use the function analogRead. Then give the if condition. If the reading is greater than the defined threshold reading, which in our case is 450, the buzzer value would get high, which means the buzzer will beep; otherwise, it will remain low. At last, give some delay to get the other reading