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01/09/2023

About the HC-SR04

Ultrasonic sensors measure the distance using ultrasound, as the sensor head emits an ultrasound wave of a certain frequency and waits for it to bounce off the target, and by recording the time that the transmitted wave takes from the moment it was issued until the sensor receives its reflection, the distance between the sensor and the object can be calculated.

25/08/2023

PLC and PAC controllers from Allen Bradley

In this article, we will provide a comprehensive overview of Allen Bradley microcontrollers.

We have noticed a growing interest in Automation Allen-Bradley (AB) - Rockwell, and accordingly, we will present many articles about this company's systems, such as PLCS (Programmable Logic Controller), and PAC systems (Programmable Automation Controller): Programmable automated controllers, and their programming.

As you know, dear reader, PLCs have undergone software and hardware improvements over the last 50 years. So let's distinguish it from PACs with one phrase; Because PLCs have evolved into PACs.

Lynde Bradley founded the company in 1903, with financial support from Dr. Stanton Allen, and as a result it became the Allen Bradley Company.

Allen Bradley is a trademark of many factory automation products, and today it is owned by Rockwell Automation.

Allen Bradley products

Today, the company manufactures programmable logic controllers (PLCs), HMI monitors, sensors, safety equipment and systems, software, drive circuits and systems, contactors, and control centers.

It is headquartered in Milwaukee, Wisconsin. As for the main landmark, it is the “AB” clock tower, which contains the largest clock in the western hemisphere, the clock that is characterized by four sides.
Their first patented engine control unit, the carbon disc compressor type used in industrial cranes, was shown at the St. Louis World's Fair in 1904.Allen Bradley programmable logic controllers (PLC)

The company began manufacturing PLC controllers with the effort of the inventor (Odo Josef Struger), who is often called the founder of programmable logic controllers. Odo's ideas contributed to the invention of Allen Bradley controllers during the period between 1958-1960, and he is credited with developing the name PLC. The company became one of the main manufacturers of PLC during his work, and he also contributed by leading the development project of the IEC61131-3 standard related to PLC programming language standards.

PLC-2, PLC-3, PLC-5:

Now let's talk about the products that made them great. The first PLCs to be introduced to t

24/07/2023

Rain sensor
The rain sensor is used to detect water, as it can detect more than the humidity sensor can detect.
The FC-37 sensor (or other versions such as the YL-83) consists of two parts: the electronic board, and the collector board that collects water droplets.
The rain sensor contains a built-in potentiometer to adjust the sensitivity of the digital output. It also contains an LED that lights up when the sensor is on and another LED that lights up when the sensor is giving a digital output.
How does the sensor work?
The operation of the sensor can be explained simply, as the resistance of the collector plate changes according to the amount of water on its surface.
When the plate:

Wet: the resistance increases and the output voltage decreases.
Dry: the resistance decreases and the output voltage is greater. Example: connecting a rain sensor with Arduino
Here we will provide a simple example to show how to use the rain sensor in projects with Arduino, where we will read the sensor output values
analogues and display them on the IDE's serial interface.
In this example, you will need the following components:

Arduino UNO board.
YL-83 rain sensor.
connection board.
220ohm resistor.
LED number 2.
connecting wires.

19/04/2023

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19/04/2023

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