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Ultrasonic ranging module for Arduino and other microcontroller projects
This is a module with a 40kHz ultrasonic transmitter / receiver pair mounted on the front of a small PCB, with the required control circuitry on the back.
It sends a short 40kHz square wave out, and calculates the distance by recording the time it takes the wave to return to the sensor.
Voltage : 5VDC
Working Range : 20mm to 4500mm
Accuracy : 2mm
Example project:
HC SR04 Distance Measurement Tool
This article will demonstrate how to build a simple distance measuring device using the HC SR05 ultrasonic sensor board. This project can be used standalone as a way of measuring short distances or, it can be incorporated into other projects that require distance measuring. This sensor works best when the two transceivers are parallel to a solid surface, at a distance between 2cm to 450cm.
Here’s what you will need:
Tools
Step 1
First, you will need to connect the HCSR04 sensor to the Arduino. Simply use the male to female jumper leads to connect the two together as described below and in fig.1:
HCSR04 Arduino
VCC-----------------------------------------5V
Trig------------------------------------------D3
Echo----------------------------------------D2
GND---------------------------------------GND
Step 2
Solder the KY1602 module onto the 1602 LCD screen. Pin 1 on the KY1602 module is the one closest to the 4 data and power pins. Once soldered, you can now connect the LCD display to the Arduino as shown in fig. 1.
fig. 1 Step 3
Connect the Arduino to a computer and install the libraries mentioned above. If you need help installing the libraries, CLICK HERE for a quick tutorial.
Step 4 You can now start writing the code to get this all working: First, clear the IDE window. Then, include the aforementioned libraries:
Initialize the KY1602 I2C LCD driver (address 0x27 in this example) and specify the LCD display (in this case 16 characters, 2 rows):
Begin the void setup function. Initialize the LCD screen and turn on the backlight:
Add 100ms delay:
The completed code should look like this:
Step 5
Press the “Upload” button at the top (button with tick, located below “File”). The IDE will now compile the code and upload it to your Arduino (this will take a few moments).
Step 6
All done! The LCD will now start to display the distance calculated by the sensor.
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The KY015 is a temperature and humidity module for Arduino and other microcontroller projects
KY-015 module has a DHT11digital temperature and humidity sensor and a resistor. The DHT11 uses a thermistor for the temperature sensing and a capacitive humidity sensor along with an internal IC to give a digital output for both temperature and humidity.
Voltage : 3.3 to 5VDC
Humidity range : 20% to 90% @ 5% RH accuracy
Temperature range : 0C to 50C at 2C accuracy
Size 30x15mm
Here is an example project to measure temperature and humidity using the KY015 module and an Arduino Uno
Temperature and Humidity Sensor
In this project, we will be building a weather station that can measure both temperature and humidity.
This is what you will need:
Components
Arduino Uno x 1 or Arduino Nano x 1
Libraries
Adafruit Unified Sensor Library
First you will nedd to assemble the project. Connect everything together using the wiring diagram bellow for reference.
Connect the KY-015 sensor module to the Arduino
Ground - - - - - - - - - - Ground
Vcc - - - - - - - - - - - - - - 3v3
Data - - - - - - - - - - - - - A0
A 10KΩ pull-up resistor is built in to the KY-015
Connect your Arduino to the PC and install the above Libraries. If you don’t know how to do this, CLICK HERE and follow the “Installing Arduino Libraries” section.
We can now create the code to get this all working
First, delete the code in the IDE window, then include the aforementioned libraries:
#include "DHT.h"
This bit of code imports the DHT library and links it to the sketch.
#define DHTPIN A0
#define DHTTYPE DHT11
This bit of code defines which pin is KY015 connected to and sets the type of sensor (KY015 uses DHT11)
DHT dht(DHTPIN, DHTTYPE);
This bit of code initialises the sensor
void setup() {
Serial.begin(115200);
Serial.println(F("DHT11 test!"));
dht.begin();
}
The setup bit of code initialises serial output with baud rate of 115200 and prints DHT11 test! In the console
void loop() {
delay(2000);
This bit makes the Arduino wait 2 seconds between measurements
float h = dht.readHumidity();
Read humidity from the sensor
float t = dht.readTemperature();
Read temperature from the sensor
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.println(F("°C "));
}
Print the latest reading in serial monitor
Finished Code:
#include "DHT.h"
#define DHTPIN A0 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(115200);
Serial.println(F("DHT11 test!"));
dht.begin();
}
void loop() {
delay(2000);
float h = dht.readHumidity();
float t = dht.readTemperature();
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.println(F("°C "));
}
