How to use a relay shield probably in the project?

As is know to all, if connect a LED to the digital output of Arduino, and make this pin output High or Low, the LED would be on/off. This is the first step to learn Arduino. But sometimes, we want to control some modules that works in high voltage/large current, for example, I want to control my lamp (works in voltage>100V) with the Arduino, it is not a good idea to connect the lamp to the Arduino digital output pin now.

Yes, the Arduino can only output voltage 5V max, and current 20mA max. It is much lower that the voltage that the lamp works with. We need a module to make it possible to control the high voltage/large current with Arduino. That is what a relay shield can do. The relay is an electrically operated switch, it acts like a soldier, accept low voltage signal commands for Arduino, and then control the high voltage gun on/off.

But it is theoretical, we need to notice something in actual usage. The Elecrow Relay Shield has the following points to ensure its usage. A reliable relays is the most important, and as the copper width and weight will Impacts the max current that can be flowed in the circuit, the width of the layout should meet the current requirements. Isolation within HIHG voltage and Low voltage circuit.

When the onboard 4 relays are all active, they need a max current of about 300mA, that is a large load for Arduino power circuit, especially when powered by USB. So, an extra power circuit is added in the elecrow relay shield, with a diode (D6) to protect the board when power reversed connected.

How to use a relay shield correctly? Cut off the power wire of your lamp; Connect on end to the COM1, and the other end to NO1; Ensure the manual control switch on the off side; Insert the relay shield on Arduino and power up. Now, you can control the lamp on/off by Arduino, digital out HIHG on D5 would makes the COM port connected with the NO1, that is , the lamp will be on; while output a logical LOW while makes the lamp off.

Beside a relay shield, there are also some other modules have many functions to make some project to better serve our life. For example, you can use a pressure sensor to make a system to test the air pressure or other pressure in your house. In a word, make full of some electronic modules to create some project to make your life more intelligent.

Rapid growth of the global pressure sensor for use in daily life

Nowadays, the pressure sensor is widely used in people’s daily life. The need of pressure sensor is fast and continuously increasing. With the increasing demand in automotive sector and technological advancements in the sensors technology, the global pressure sensor market has got a rapid growth these years. According to a report, the global pressure sensor market worth $7.34 Billion by 2017.

Sensors have become important part of any automation and measurement application. Sensors are responsible for converting physical phenomena into electrical data which is then measured through a data-acquisition system. The significant growth of advanced electronic control systems coupled with rise in sensor accuracy, response time, reliability, robustness, miniaturization, efficiency and communications capability is leading to growing demand for sensors across various end-use sectors.

Today’s pressure sensors mainly utilize digital technology that can be better in efficiency and sensing performance. Pressure sensors have a significant place in different industry verticals. The major applications of pressure sensors are in petrochemical industry, automotive industry, consumer electronics industry, process industries, and healthcare. The largest application segment for pressure sensors is the automotive segment due to their use in tire pressure monitoring systems, engine management, and automatic transmission.

There are many benefits of pressure sensors. They can be used in many functions. In the medical industry, pressure sensors are used as low-cost disposable devices for catheters employed in surgical operations. The demand for reliable, high performance and low cost sensors is increasing, leading to the development of new technologies like elecrow. Pressure sensors can vary drastically in technology, design, performance, application suitability and cost.

Various product categories of pressure sensors include capacitive pressure sensor, electromagnetic pressure sensor, resonant solid-state pressure sensor and optical pressure sensor. The pressure sensors market is driven by growing demand from automotive sector. The demand for chemical sensors is driven by increased demand in automotive sector, especially, growth in production of light vehicles. Increasing sales of optical sensors are leading to growth of pressure sensors market.

In a word, the development of pressure sensor is quite fast with the fast development economy. The demand for optical sensors is growing owing to increasing uses in rapidly growing smart phones and tablets market. Besides the pressure sensors which are widely used in people’s daily life, there is a product also widely used in daily life -- Arduino GPS Shield. This kind of product can highly serve people’s daily life due to its useful features. 

Awesome features of PCB Assembly service you can’t skip!

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PCB assembly services doesn't have to mean outsourcing to a company across the other side of the world. It can simply mean a company completely US-based, ready to help with all of your supply and manufacturing needs. Besides PCB assembly service, makers can also buy 3D printer to make their products more excellent! Elecrow 3D printer is available and there are also many amazing benefits of it for you to choose.