Frequently Asked Questions
FSR sensor FAQ
Pressure distribution kit FAQ
Sleep monitoring system FAQ
Q:Can RP-C7.6LT-LF2 detect pulse fluctuations? Is it accurate?
A: Ability to detect pulse fluctuations. The pulse beat triggers the pressure change of the sensor, which causes the resistance value of the sensor to change, and the pulse fluctuation can be measured by detecting the resistance. But the accuracy is mainly related to the conditioning circuit and calculation algorithm.
Q:During the test of the RP-L series, it is found that the pressure at different points is the same, but the resistance is different. Is this normal? For example, if I take a 50g weight and place it in different positions, the resistance is different, some are very sensitive, and some remain unchanged. Even at 500g, there is no resistance change at some points.
A: Different points have the same pressure, but different resistances, this is normal
1. Rigid objects (such as weights) cannot fully contact the contact surface of the sensor. It is recommended to add soft rubber pads under the weights to ensure uniform pressure distribution.
2. Because the structure of the sensor is isolated on the periphery, the area where there is no sense, the sensing area is 8 mm in the middle. Therefore, at different points, it is possible that the same pressure and different positions may cause different resistance values due to different sensing areas.
Q:Will 0 and 1 appear when RP-C-MK02 reaches a certain pressure?
A: The pressure sensor is equivalent to a variable resistor, and the output of the pressure change is an analog change signal, which needs to be converted to 0 or 1 through a comparison circuit.
Our circuit module has a high-level or low-level io output port
Q: Can an RP-L sensor connect directly to a controller IO pin?
An FSR is a variable resistor. Use a suitable voltage-divider or signal-conditioning circuit for an analog input, or a comparator circuit for a switching signal. Check the controller input specifications and the sensor datasheet before connecting.
Q:What is the difference between a thin film pressure sensor and a piezoelectric film?
A: The most significant difference between the pressure sensor and piezoelectric is: thin-film pressure sensor can measure dynamic and static signals, but piezoelectric can only measure dynamic signals.
Q: Does an FSR output resistance or capacitance?
An FSR provides a resistance response to applied force. For interface design, use the resistance characteristics in the model datasheet. If parasitic capacitance matters to your circuit, share the model and measurement conditions with our technical team.
Q: Can I use an FSR sensor with Arduino or ESP32?
Yes. Use a voltage-divider or signal-conditioning circuit to convert the sensor resistance change into a voltage suitable for the board ADC input. Select circuit values for your sensor model and force range. Contact us for a recommended wiring diagram.
Q:How to make the membrane pressure sensor waterproof?
A: Seals can be used to seal the vent of the sensor, but a certain amount of cavity is required.
Q: How does the RP-S40-ST work? Is it a switch?
The RP-S40-ST is a resistive force sensor whose resistance changes with applied force. It is not a digital switch by itself. Use an analog readout circuit to measure the response, or a comparator circuit to generate an on/off signal at a selected threshold.
Q:The RP-C7.6-LT-LF2 sensor is matched with the above resistance-to-voltage module. The sensitivity of the output voltage and the corresponding relationship of the potentiometer, such as the change of the potentiometer corresponds to how the sensitivity changes, the sensitivity unit is V/g or V/ N
A: There is no definite corresponding relationship. The resistance-to-voltage module of our Taobao store is just a demonstration module. The purpose is to allow users to quickly understand the digital signal changes corresponding to the sensor. If you need accurate correspondence, you need to customize it.
Q:GS04742 FSR thin film pressure sensor smart balance car smart high-end seat (RP-S40-ST) May I ask how much precision can be achieved?
A: Explanation of accuracy error, resolution, and sensitivity. Accuracy error refers to the degree of agreement between the measured measurement result and the true value. Thin-film pressure sensors are not suitable for accurate force measurement, please use them with caution. Resolution refers to the ability of the sensor to detect the smallest change in the measurement. The resolution of the thin-film pressure sensor is about 10g Sensitivity is expressed as the ratio of the increment of the output quantity to the corresponding increment of the input quantity that caused the increment. The sensitivity of the membrane pressure sensor is about 10g
Q:Can the RP-L series be connected with a 3V lithium battery?
A: OK
Q:How to ensure the consistency of the pressure film?
A: Through production process control and testing equipment, if there is any consistency requirement, please inform LiSense Technology in advance.
Q: What electrical limits should I follow for an RP-L sensor?
The permissible electrical operating conditions depend on the sensor model and readout circuit. Use the limits in the current model datasheet, and limit sensor current with a suitable circuit. Contact our technical team if your required voltage or current is not specified.
Q:What are the contact surface requirements for calibrating the pressure sensor?
A:
The area of force, the tool of force, and the position of force must be consistent
Q:The weight is placed on the sensor. Why does the output value of the sensor keep changing?
A: First of all, make sure that the pressure application device is stable when pressure is applied. For example, if weight is directly placed on the FSR sensor because the contact is incomplete or pure hard contact, the fluctuation will be relatively large. If the pressure device is stable, there will also be changed in the resistance value output, specific performance The resistance value will gradually decrease, but after a period of time, it will stabilize. This is the drift of the sensor, and any sensor will have the characteristic of drift.
Q:What is the name of the interface of the FS-INS-W99 sensor, and what kind of socket should be used?
A: The interface is called the 24Pin FPC interface. Choose connector specification 1mm pitch 24pin, upper contact, recommended model AFA07-S24ECA-00
Q:What is the accuracy of the sensor, what signal is output, and is it necessary to filter and reduce noise?
A: The accuracy of the sensor is about 10%, and the output analog signal is good, which is equivalent to a resistor network. It needs to be connected to an analog conditioning circuit, and filtering and noise reduction are required.
Q:FS-INS-16Z-V1 16-zone pressure sensor Is it possible to connect this template to Android and what does it require?
A: It needs to be connected through the Bluetooth serial port transparent transmission method.
Q:What type of FPC interface does FS-INS-16Z use?
A: The interface is called the 20Pin FPC interface. Choose the connector specification 1mm pitch 20pin, upper contact, can be purchased on the Lichuang Mall: https://item.szlcsc.com/44393.html
Q:What are the effects of high frame rate of RPPS-2500, such as heat generation and decreased accuracy
A: A higher frame rate means that the amount of data transmitted within a certain period of time is larger, which will increase the probability of abnormal phenomena such as ghost points during data transmission.
Q: Can the FS-INS-W99 be used with Arduino?
Integration requires compatible acquisition electronics for the multi-point sensor. Check the sensor connector, channel count, and readout requirements. If using a complete acquisition kit, select a controller interface that matches the kit communication protocol.
Q: Which LEGACT sensors can I integrate with a microcontroller?
Single-point FSR sensors can be read through suitable analog conditioning circuits. Sensor arrays require multi-channel acquisition electronics. Complete kits have model-specific interfaces and communication protocols. Tell us your controller and application so we can recommend an integration path.
Q:What is the format of RPPS-255 sdk?
A: Without SDK, it provides the communication protocol of the hardware acquisition circuit. After power-on, the hardware actively sends data through USB. The upper computer can parse the data according to the communication protocol.
Q: Are plantar pressure readings raw ADC values or calibrated measurements?
The output depends on the acquisition hardware and software version. Raw ADC readings represent sensor response and require calibration before conversion to force or pressure units. Confirm the supplied calibration and output units for your selected kit. Pressure conversion also requires the defined loaded area.
Q:What is the difference between the frame rate of RPPS-2500?
A: 20fps is suitable for static evaluation, and 100fps is suitable for dynamic evaluation. 20fps is relatively more stable
Q:What type of FPC interface should be used for S-INS-99W and purchase link?
A: 1.0 pitch 24Pin link
https://item.taobao.com/item.htm?spm=a1z09.2.0.0.4d132e8dmCl1c8&id=590324705032&_u=j1miu3o11ce
Q:What data value does FS-INS-16Z output?
A: resistance
Q:How to increase the frequency of insole collection pressure?
A: Limited by the relatively large amount of data, the current hardware design has reached the limit
Q:Can RPPS-99 be re-developed?
A: Yes, we will provide the communication protocol file, which is usually included in the technical specification.
Q: How to place, install and use?
Follow the installation instructions for your specific sleep monitor model. Position the sensing band beneath the upper-body area on a flat, stable bed surface. The permitted covering material and thickness depend on the model and installation; confirm them in the current product manual.
Q: During the whole night’s sleep, there will be reports of getting out of bed without getting out of bed. Why?
A: The main reason is that the person does not press on the sensor or the mattress placed on the sensor is too thick. If the bed is more than 1 meter wide, avoid placing the sleeping belt on the edge of the bed.
Avoid placing too thick cushions on the sleeping belt. It is best to place the sleeping belt under the thin sheets.
Q:What are the monitoring contents of the sleeping blanket?
A: Heart rate, respiration, body movement, etc.
Q:Heart rate, respiration, body movement, etc.
A: Sleep monitoring is a sleep monitor comparable to medical equipment. The ultra-sensitive sensor can measure the tiny vibrations of the heart and breathing. In addition to accurately monitoring the heart rate, it can also monitor the movement, breathing, turning over, getting out of bed, and other data during sleep. On the basis of sleep monitoring, it can also intelligently analyze sleep status and give relevant sleep improvement suggestions.
Q:Suitable crowd and environment?
A: The pressure sensor and the piezoelectric film sensor are passive components, and they both need to have actual pressure and vibration to trigger their work. The working state radiation of the collection circuit is much lower than that of the mobile phone, and all people including pregnant women and children can use it with confidence.
Q:Is a double bed or a magnetic bed with physiotherapy function available?
A: The sleep monitoring system can track your sleep on the double bed. But everyone who tracks sleep needs an independent sleep monitoring system.
It can be used on a magnetic bed with physiotherapy function.
Q:What are the precautions in use?
A: This product is positioned as an auxiliary product for monitoring sleep and making preventive suggestions. Please remember that this product is not a medical device or a device for preventing sudden death. Users should not rely on this device completely and ignore the care of the monitored person. The family members of users with illnesses should personally check the condition of the monitored person from time to time. This product is not suitable for people with pacemakers, please remember. The product has a built-in sensor. Excessive bending may damage the sensor. Do not use this product in contact with high-temperature equipment, and do not use it together with equipment such as electric blankets. Do not throw the sleep monitoring system into the water. If it is dirty, wipe it with a wet towel. The sleep monitoring mat is suitable for a flat and stable surface. Please do not place the sleep monitoring mat on a bed with an activity function, such as a hammock. This may cause the sleep monitoring pad to not perform its normal functions. If you do not use the product for a long time, please disconnect the power supply of the controller. The sleep monitoring pad can be rolled up and stored. Please do not fold and compress the sleep monitoring pad, which may cause damage to the product.
Q:How to place, install and use?
Follow the installation instructions for your specific sleep monitor model. Position the sensing band beneath the upper-body area on a flat, stable bed surface. The permitted covering material and thickness depend on the model and installation; confirm them in the current product manual.
Q:During the whole night’s sleep, there will be reports of getting out of bed without getting out of bed. Why?
A: The main reason is that the person does not press on the sensor or the mattress placed on the sensor is too thick. If it is a bed larger than 1 meter wide, avoid placing the sleeping belt on the edge of the bed. Avoid putting too thick cushions on the sleeping belt, it is best to place the sleeping belt under the thin sheets.
Q:What are the monitoring contents of the sleeping blanket?
A:Heart rate, respiration, body movement, etc.
Q:What is the monitoring principle of the sleeping blanket?
A: Sleep monitoring is a sleep monitor comparable to medical equipment. The ultra-sensitive sensor can measure the tiny vibrations of the heart and breathing. In addition to accurately monitoring the heart rate, it can also monitor the movement, breathing, turning over, getting out of bed, and other data during sleep. On the basis of sleep monitoring, it can also intelligently analyze sleep status and give relevant sleep improvement suggestions.
Q:Suitable crowd and environment?
A:As passive components, pressure sensors and piezoelectric film sensors both need actual pressure and vibration to trigger their work. The working state radiation of the collection circuit is far lower than that of the mobile phone, and all people including pregnant women and children can use it with confidence.
Q: Are double beds or magnetic beds with physiotherapy available?
A: The sleep monitoring system can track your sleep on the double bed. But everyone who tracks sleep needs an independent sleep monitoring system. It can be used on a magnetic bed with physiotherapy function.
Q:Precautions in use?
A: This product is positioned as an auxiliary product for monitoring sleep and making preventive suggestions. Please remember that this product is not a medical device or a device for preventing sudden death. Users should not rely on this device completely and ignore the care of the monitored person. The family members of users with medical conditions should personally check the condition of the monitored person from time to time.
This product is not suitable for people with pacemakers, please remember.
The product has a built-in sensor. Excessive bending may damage the sensor.
Do not use this product in contact with high-temperature equipment, and do not use it together with equipment such as electric blankets.
Do not throw the sleep monitoring system into the water. If it is dirty, wipe it with a wet towel.
The sleep monitoring mat is suitable for a flat and stable surface. Please do not place the sleep monitoring mat on a bed with an activity function, such as a hammock. This may cause the sleep monitoring pad to fail to perform its normal functions.
If you do not use the product for a long time, please disconnect the power supply of the controller. The sleep monitoring pad can be rolled up and stored. Please do not fold and compress the sleep monitoring pad, which may cause damage to the product.
