This article is a continuation of the series on “Embedded Sensor – ADXL345” and carries the discussion on Size, Functional Diagram, Pin Configuration, Application, Features and Benefits, ADXL345 Interface accelerometer, and Projects with this accelerometer. This sensor from Analog Devices
Digital output data is formatted as 16-bit twos complement and is accessible through either an SPI (3- or 4-wire) or I2C digital interface.
A proximity sensor is a type of sensor that detects the presence or absence of an object or obstacle in close proximity to it without physical contact. It works by emitting an electromagnetic field or beam of electromagnetic radiation, and then detecting changes in the field or radiation caused by the presence or absence of an object. Proximity sensors are commonly used in various applications such as automatic door openers, touchless faucets, mobile devices for screen activation, and industrial automation for object detection.
Read more: Embedded Sensor – ProximityThis sensor installed on the front of an iPhone 5 next to the earpiece automatically turns off the touchscreen when the sensor comes within a predefined range of an object (such as a human ear) when using the handset.
Ultrasonic parking sensor: Source
Parking sensor on a fender
This tutorial is about NTC Temperature sensor. Thermistors are temperature-sensing elements made of semiconductor material that have been sintered to display large changes in resistance in proportion to small changes in temperature. This resistance can be measured by using a small and measured direct current, or dc, passed through the thermistor in order to measure the voltage drop produced. These solid state temperature sensors actually act like electrical resistors that are temperature sensitive. That is where the name, a clear combination of the words thermal and resistor, comes from. Ametherm specializes in NTC, or negative temperature coefficient, thermistors.
NTC (Negative Temperature Coefficient) thermistors, also known as NTC temperature sensors, measure temperature. They consist of semiconductor materials with a resistance that decreases as temperature increases. NTC thermistors exhibit a nonlinear resistance-temperature relationship, with resistance decreasing rapidly as temperature rises and vice versa.
These sensors are widely used in various applications due to their simplicity, accuracy, and low cost. Some common applications of NTC temperature sensors include:
/* Arduino PIR Motion Sensor Tutorial */
/* www.ArunEworld.com */
int pirSensor = 8;
int relayInput = 7;
void setup() {
pinMode(pirSensor, INPUT);
pinMode(relayInput, OUTPUT);
}
void loop() {
int sensorValue = digitalRead(pirSensor);
if (sensorValue == HIGH) {
digitalWrite(relayInput, LOW); // The Relay Input works Inversely
}
}
This Arduino code is for a PIR (Passive Infrared) motion sensor setup, where a relay is controlled based on motion detection. Here’s an explanation of each part:
| Section | Explanation |
|---|---|
| Comments | The code includes comments providing information about the purpose of the code and its source. |
| Variable Declaration | – pirSensor = 8;: Declares a variable pirSensor and assigns pin 8 to it for reading the PIR sensor’s output. – relayInput = 7;: Declares a variable relayInput and assigns pin 7 to it for controlling the relay. |
| Setup Function | Initializes the pins: – Sets pirSensor pin as INPUT to receive data from the PIR sensor. – Sets relayInput pin as OUTPUT to control the relay. |
| Loop Function | – Reads the digital state from the pirSensor pin to check for motion detection. – If motion is detected (sensor value is HIGH), it turns on the relay by setting the relayInput pin LOW. |
Bosch Sensortec developed the BMP280 as a barometric pressure sensor. It’s designed with high accuracy and precision to measure atmospheric pressure and temperature. The sensor is commonly used in various applications such as weather stations, altitude measurement, indoor navigation, and IoT (Internet of Things) devices.
The BMP280 sensor utilizes a MEMS (Micro-Electro-Mechanical Systems) pressure sensor to detect atmospheric pressure changes. Additionally, an integrated temperature sensor provides temperature measurements. These measurements enable the calculation of altitude and provide data for weather forecasting, environmental monitoring, and other applications.
This sensor communicates with microcontrollers or other devices via standard interfaces like I2C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface). Consequently, it’s easy to integrate into a wide range of electronic systems.
The BMP280 sensor finds applications in various fields due to its ability to measure barometric pressure and temperature accurately. Consequently, here are some common uses:
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