What is an Internet of Things device?

IoT devices include bar codes, radio frequency identification (RFID), sensors, global positioning systems, laser scanners and other information. Sensing equipment is the basic equipment.

1, barcode:

Bar code technology was first produced in the trembling twenties, and was born in the laboratory of Westinghouse. At that time, every idea about the application of electronic technology was very novel. His idea is to put a barcode on the envelope, and the information in the barcode is the address of the recipient, just like today's postal code. For this reason, Kermode invented the earliest bar code recognition. The design scheme is very simple, that is, one represents the number "1", two represents the number "2", and so on.

2. Radio Frequency Identification (RFID):

RFID radio frequency identification is a non-contact automatic identification technology, which can automatically identify the target object and obtain relevant data through radio frequency signals, and can work in various harsh environments without manual intervention. RFID technology can identify high-speed moving objects and multiple tags at the same time, which is quick and convenient to operate. ?

3. Sensors:

The resistance sensor is made by using the principle that rheostat converts the measured non-electric quantity into resistance signal. Resistance sensors generally include potentiometers, contact variable resistors, resistance strain gage and piezoresistive sensors. Resistance sensors are mainly used to measure displacement, pressure, force, strain, torque, air velocity, liquid level, liquid flow and other parameters.

Capacitive sensor changes the capacitance by changing the geometric size of the capacitance or changing the nature and content of the medium. Mainly used for measuring pressure, displacement, liquid level, thickness, water content and other parameters.

Inductive sensor is made by changing the geometric size of magnetic circuit and the position of magnet to change inductance or mutual inductance or piezomagnetic effect. Mainly used for measuring displacement, pressure, force, vibration, acceleration and other parameters.

4. Global Positioning System:

The global positioning system itself does not distinguish between military and civilian, but the accuracy of military signals will be higher, while the accuracy of civilian signals will be almost the same. China also has a positioning system. Beidou-1 has been put into use, of course, mainly for military purposes. The Beidou-2 satellite has not been deployed yet, and there is still a gap from its use.

5. Laser scanner:

The use of the laser scanner is very simple. As long as you pull the trigger and aim the light at the bar code, the light will pass through the left and right ends of the bar code (including the blank area). As long as the bar code is good, it can generally be scanned.