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Grove - force sensors and limit switchers

Industrial and building automation systems often consist of various limit switches. These devices allow you to turn on or off certain circuits based on the current force that is applied to the measurement element. The mechanism of action uses pressure as the main indicator. The sensor turns on or off the circuit it does control, based on the detection of the pressure force exerted on the limit switch contact lever.

There are many different types of limit switches and pressure sensors. Standard pressure force transducers work by measuring the degree of deformation of a given elastic measuring element. These components have been programmed in such a way that it is possible to interpret the force applied to the device with high precision. The deformation of the measuring part will cause the resistance change. The whole is integrated within the electronic system that works directly with the force / pressure sensor.

In this category of the Botland store, we offer the highest quality limit switches and pressure sensors. These elements will be useful in creating your own Internet of Things projects. Additionally, we present pressure force sensors - Grove modules that are fully compatible with popular programmable electronics (Arduino and Raspberry Pi boards). The great advantage of these devices is a very simple way of connecting them. The small dimensions of these components facilitate the trouble-free use of Grove sensors in various projects of automation and measurement systems.

Products: 2
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Grove - mini limit sensor with roller

Module from the Grove series equipped with a limit switch with lever ended with roller. Working voltage is 3.3 V and 5 V. T he kit includes a cable adapted to Seeedstudio Base...
Index: SEE-11335
Index: SEE-11335
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Waiting time approx. 10-30 days
Regular price €3.70 Price €3.70

Grove - force sensor FSR402 with module - 2kg

Module from the Grove series, is equipped with a sensor of pressure force FSR402. The sensor communicates with the analog voltage signal. It is able to detect a pressure in...
Index: SEE-12595
Index: SEE-12595
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In stock, shipping 24 hours!
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Regular price €13.23 Price €13.23

How do pressure sensors work and what are they for?

Regardless of the application, limit switches and pressure sensors in practice are only responsible for two main functions: switching on and off electric circuits. To illustrate how such sensors work, it is worth giving an example of a refrigerator. When you open the refrigerator, the bulb inside lights up. Similarly, the bulb will go out when it is closing. The light inside the refrigerator will turn off because the lighting inside the refrigerator is only needed when you look inside. How was this effect achieved?

This process is carried out just by the limit switch. The pressure sensor receives information that the refrigerator is opened (pressure released) and the refrigerator closed (pressure applied). A properly programmed device simply performs a simple action automatically: it turns the light on or off.

The use of pressure sensors is very common. In practice, you will find them in a multitude of devices that you have around you, both at home and at work. For example, in washing machines and in microwave ovens, the sensor turns off the voltage of the control and operating circuits of these devices when the door opening is identified. One of the most important functions of this type of device, responsible for our safety, works in this way. The limit switch serves as a protection against damage to the device and from injury to the user.

Pressure sensors – they are all around us!

The use of pressure sensors is not limited to household appliances and audio / video devices. However, in large factory machines and on production lines in industry, limit sensors perform similar functions as in household appliances. When the industrial robot encounters a breakdown and malfunctions, the limit switch disconnects the power to the control system and the robot's drive. Thanks to this, it ensures the safety of employees and manufactured products that could be damaged.

In construction machinery such as dump trucks or excavators (and even in city buses and public transport), the sensor will activate the acoustic generator of a cyclic warning signal while the vehicle moves backwards. This signal is designed to warn outsiders that the vehicle is reversing - certainly we all know it, because it is not one of the most pleasant. In this category you will find various similar force and pressure sensors. They are compatible with programmable electronics such as Arduino or Raspberry Pi. For example, the Grove limit sensor, when changing the position of the contact lever, sends a binary signal to the digital input in Arduino, informing about switching the circuit on or off.

Resistive pressure sensors – application examples

A variation of the presented devices are the FSR resistance force sensors. FSR sensors use in their construction a surface element with a variable resistance value. The resistance varies with the force of pressure. The surface of the FSR sensor is made of two layers - conductive and dielectric - separated by air. Applying pressure to the sensor will cause its conductive layer to deform, which will further reduce its resistance. Similarly, after removing the load from the sensor, the resistance level of the conductive layer will increase. Resistive pressure sensors are used in electric musical instruments (drums, keyboards), as well as in car control systems.

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