Pressure sensors (also known as strain gauges) are devices that convert mechanical energy into electrical energy. The process occurs by detecting the pressure force that is exerted on the surface. This force is then converted into an electrical signal (current or voltage). The value of the electrical signal is relatively proportional to the pressure force.
Pressure sensors
Piezoelectric membrane with wires - 20mm - SparkFun SEN-10293
The piezoelectric elements are useful for detecting the vibration or knocking. You can use them in a simple way by reading the voltage at the output. It can also be used for...Strain Beam Module - with 24-bit ADC NAU7802 - STEMMA QT / Qwiic - Adafruit 4538
The Adafruit module is equipped with the NAU7802 chip, which enables reading data from strain gauge beams . Includes ultra high resolution 24 bit differential ADC with...Tensometric beam NA27 10kg (100N)
Strain-gauge beam operating in the range of up to 10 kg (100 N approx.). It is applied, for example, for kitchen scales, portable scales. The connecting cable has tips with the...Strain gauge sensor presure force of 50kg
The pressure sensor reduces its resistance when the force put to the square tip, increases. The sensor in the form of a rectangle with the side of 34 mm. For the operation...The conductive membrane for measuring the pressure of the force - Adafruit 1361
The membrane is made of a conductive material. The pressure, at any point, changes the resistance, which leads to the measurable change of the voltage in a simple way. The...Deflection sensor 73x6,3mm - SparkFun SEN-10264
During the bending, sensor increases its resistance. It can be used to detect hand movements, for example, crimping fists. Sensor length is 55 mm.Tensometric beam NA27 5kg (50N)
Strain-gauge beam operating in the range of up to 5 kg (approx. 50 N). The smallest version is used, for example, in kitchen scales, portable scales. The connecting cable...Force sensor FSR-402 - 2kg round 18mm - Pololu 1696
The pressure sensor reduces its resistance as the force applied to the round tip increases. Round sensor with a diameter of 18 mm.Tensometric beam NA27 1kg (10N)
Strain-gauge beam operating in the range of up to 1 kg (approx. 10 N). The smallest version is used, for example, in kitchen scales, portable scales. The connecting cable has...HX711 - amplifier for a strainer beam - SparkFun SEN-13879
Operational amplifier is designed to handle strain beams. The system is supplied with the voltage from 2.7 V to 5.0 V, communicates via a two-wire bus: the data line and a...Tension beam YZC-1B (97) 40kg (400N)
Strain-gauge beam operating in the range of up to 40 kg (400 N approx.). It is applied, for example, for kitchen scales, portable scales. The connecting cable has tips with the...Force sensor round 5mm (0.25 '') - short connector - Pololu 2727
Pressure sensor reduces its resistance when the force put to the round tip, increases. The sensor with the short connector, round, with about 5 mm diameter.FlexiForce Pressure Sensor - 25lbs. (1" area) - SparkFun SEN-11207
Pressure sensor reduces its resistance when the force put to the round tip, increases. The round sensor with a diameter of 25.4 mm, the maximum pressure is 11 kg.Tensometric beam NA1 8kg (80N)
Strain-gauge beam operating in the range of up to 8 kg (80 N approx.). It is applied, for example, for kitchen scales, portable scales. The connecting cable has tips with the...Qwiic Scale - NAU7802 module for tensometric beam - SparkFun SEN-15242
The module is based on a NAU7802 system enabling the reading of data from a strain-gauge beams. By connecting the model to the microcontroller, you can read the change in...Stretch sensor - conductive rubber sheet - 200x200x1mm - Adafruit 5463
Tensile sensor in the form of a rubber sheet with dimensions of 200 x 200 x 1 mm. The principle of operation is very simple - the product increases its electrical resistance...Force sensor FSR-406 - 2kg square 38mm - Pololu 1645
Force sensor changes its resistance when the force applied to the square tip, increases. The sensor in the form of a rectangle with side of 38 mm.Deflection sensor 112x6,3mm - SparkFun SEN-08606
During the bending, sensor increases its resistance. It can be used to detect the movement of your hand. Sensor length: 112 mm.Pressure sensor cell 50kg - 4pcs.
Pressure sensor reduces its resistance when the force put to the square tip, increases. The sensor is in the form of a rectangle with sides of 33 mm. The set has 4 pieces,...Load Sensor Combinator (Ver. 1.1) - SparkFun BOB-13878
The module allows you to connect 4 load sensors - strain-gauge beams to one of the bridge via 4-wire cable. It finds application, for example, in the construction of the...Stretch sensor - conductive rubber sheet - 200x200x0,5mm - Adafruit 5464
Tensile sensor in the form of a rubber sheet with dimensions of 200 x 200 x 0.5 mm. The principle of operation is very simple - the product increases its electrical resistance...Tensometric beam NA1 10kg (100N)
Strain gauge beam allowing to measure loads up to 10 kg . It is perfect for places where measurement accuracy is an absolute priority. The tightness level of the beam is IP66...Mini Scales Unit - Pressure sensor up to 5kg - HX711 - expansion module Unit - M5Stack U177
Mini Scales Unit is an integrated miniature scale that combines a weighing sensor with a 5 kg range , an ADC acquisition system ( HX711 ) and a microprocessor for direct...See also
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Principle of operation of pressure sensors
The resistive pressure sensor (FSR) consists of two layers electrically insulated from each other. When a pressure force is applied to the outer layer in the form of a foil membrane, the insulating cover presses against the active layer, which is lined with electrically conductive measurement points. The greater the pressure force, the lower the contact resistance between the measurement points. The conductive layer is connected to a power source with auxiliary voltage, and the voltage signal, which reflects the applied pressure force, can be read, e.g. by Arduino, via an analog-to-digital converter and, based on the program algorithm, converted into the value of the weight exerted on the surface of the load cell. The measurement result can be displayed on the LCD display.
Important tips for installing strain gauges
Flat FSR sensors are made of very delicate material and great care is required when installing them. At the prototyping stage, it is easiest to connect such a sensor to the breadboard directly, or using crocodile clips or an ARK connector with screw terminals. However, if you want to solder the pressure sensor to the PCB, you must ensure that the soldering tip and the soldering surface are clean, because even within a few seconds the layers of the sensor may melt, causing permanent damage.
The compensating strain gauge is used to measure the pressure force taking into account the influence of external factors, primarily air humidity, temperature and atmospheric pressure.
The correct operation of the strain gauge sensor can be checked by supplying it with the appropriate voltage at nominal load and reading the output voltage value with an electric meter .
The resistance strain gauge uses the phenomenon of changing electrical resistance when changing the dimensions of the resistance material . Such devices are used, for example, to measure stress or pressure, for example in loading systems.