Questions tagged [sensor]
Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
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HB100 Doppler Sesnsor Calculation
Hello I have a question about first circuit shematics.
I calculated 2. circuit fcutLow and fcutHigh frequencies like that:
f2CutHigh = 1/(2 * pi * 1M * 100p) = 1.6 KHz
f2CutLow = 1/(2 * pi * 10K * ...
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Do I need to buffer these sensor outputs in this scenario?
I'm planning to use this uC board's LCD to read the humidity and temperature sensors' outputs.
Here is the datasheet for the humidity and here is for the pressure sensor.
Since the ADC of the uC is 3....
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Sensor selection for 0.5mm resolution and 0.5m range [closed]
I want to record motion of body of 1 mm2 cross-section made of metal or plastic moving in gas of low density.
I need resolution of 0.5mm (more, as in 0.5-0.1mm, is better) and range of few tens of cm.
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Using 1N4148 as temperature sensor for absolute temperature
Please forget the "why" for now, but I am attempting to determine the temperature of a 1N4148WS-E3 part by doing two measurements at different current setpoints. I've done some tests and ...
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How to find out reason for Sonoff SI7021 probe unstable connection?
In my project I have Sonoff TH10 and Sonoff TH16 - allf lashed with Tasmota 9.4.0 and several pcs of SI7021 probes. Problem is that only one SI7021 probe has stable connection, rest are unstable in ...
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What is causing the digital output of my MEMS pressure sensor to decrement continuously?
I'm a lowly mechanical engineer so bear with me. This problem has been the bane of my existence.
I'm using a temperature-compensated barometric pressure sensor in a fluid-contacting application. ...
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Have 1 temp sensor send temperature readings to 2 seperate temp gauges
My old truck (fuel injected '92 Ford Ranger) has 2 temp sensors, located where the hot coolant leaves the engine.
One sensor goes to the ECU, which alters the amount of fuel which is delivered to ...
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BLDC stator hall sensor placement
I am in the process of designing a small PCB with hall sensors for my 8-pole motor. Using TI's BLDC hall sensor guide here, I placed them 30 degrees apart from 0-axis motor shaft. This angle ...
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Will it work if I place hall sensor heads facing magnets in outrunner brushless motor
Will it work if I place hall sensors facing the magnets like in the picture below? I cannot put it in between the teeth because the hall sensor is bigger than the gap.
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Sensor linearization via simple electronics [closed]
Assume a sensor with a non-linear, but curved output, for example, a magnetic field sensor measuring field strength from a magnet on the outside of a rotating disk.
The curve would be kind of ...
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RPM sensor signal level shifting
I have an RPM sensor that outputs a square wave. The voltage level of the output signal varies between 3.3V and 8.4V depending on which supply voltage the user has chosen for the sensor.
I need a ...
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How to sense if a heater is plugged and on
I want to remotely check if one of my home sockets (which happens to power a heater) is transmitting current or not. I do this as a hobby project, so my main priority is to learn through the process ...
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How to tell if a proximity sensor is NPN or PNP?
I have a proximity sensor without nameplate. I have done some tests that made me think it is a PNP (normally open).
Is my assumption correct? Is there another method to find out?
Test setup:
Supply ...
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Need help with validation of the design of a capacitance sensor array for soil moisture measurement
Product Description
The device is a soil moisture sensing and analysis device that uses capacitance sensing technology to help manage soil moisture in your garden. One probe set at the bottom of the ...
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Latching circuit for ESP8266 with coin cell and Reed Switch
I am trying to make a circuit referencing to a YouTube video to make my circuit last long on a battery cell (CR2032). I don't know where is the problem but here is the schematic diagram I created
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Reading PT1000 using op amp
I am looking for an op-amp circuit that can take in 24 VDC and output 0-10 V. It will be connected to my temperature sensor. I have found one diagram but I believe there should be some changes to it. ...
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Do MEMS or optical gyroscope record Earth's rotational and revolutional angular velocities?
I am using a 3 axis gyroscope (Android device) to record angular velocities using a sensor data logger application.
When the device is placed stationary, the gyroscope recorded the following values:
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LIS3MDL sensor Vehicle Detection range
I want to use LIS3MDL magnetoresistive sensor for Parking Vehicle Detection project. I compared this with HMC5883L. LIS3MDL 's Full Scale range is +16 Gauss but HMC5883L 8 Gauss.
But I did not ...
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Restrict IR sensor field of view
I'm trying to develop a device that can detect or "watch" an infrared beacon that is freely moving side-to-side anywhere within a 180° field of view (-90° to +90°, with center/forward at 0°); i.e. the ...
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Ultrasonic signal generation
I am busy with a robotic arduino project. I have a 40kHz ultrasonic transducer and receiver. What would be the best way to generate the 40kHz signal to drive the transducer.
I have found two ways to ...
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Why does this 7-in-1 soil sensor print mixed values?
I'm working with a JXCT-IoT seven parameter soil sensor.
I did tests to print each parameter and it prints the correct value but when I put in all the code, the values are mixed. For example, the ...
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Is it safe to write data to MAX35103 flash memory
I am using MAX35103 sensor in my project and I want to store some constant data into MAX35103 flash memory using STM32. However, I've read something that it is not safe to write data to the MAX35103 ...
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How can I connect a CP35MHT80 laser distance sensor to a Raspberry Pi?
I am currently working on a project where I have to use an industrial laser distance sensor. My boss asked me to control it with a Raspberry Pi. I have no clue wahtsoever where to start.
The sensor ...
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Is there a technical reason why sensors goes from 0.5 to 4.5V volts?
Is there a technical reason why sensors output goes from 0.5 to 4.5V (analog) or 10% - 90% (digital)?
I understand that for diagnostic purpose one doesn't normally want to use the full range ...
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How can I make an object with curved surface touch sensitive with Arduino?
Is there a way to make a "ball" (or an object with curved surface) touch sensitive? I want the ball to do something when someone touches it with their hand.
So, currently I got an object out of ...
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Confused about the functioning of a QRE1113 reflectance sensor
First year IT student here. I've been stuck on a problem involving a QRE1113 sensor, in which we were given the schematics below:
From my understanding so far, the reflectance sensor is divided into ...
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How to increase pressure sensor breadboard sensitivity?
I build a pressure sensor breadboard according to the schematic. It works, but has quite low sensitivity - it shows some pressure only after big pressure is applied.
Is there a way to increase ...
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What component do I need to add to 24V sensor to conver to discrete high/low output for Shelly switch
I'm working on a simple smart home project where I've installed some 24V LED strips inside a pantry cabinet.
I'm using an infrared door control switch to detect when the door opens and closes and turn ...
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I am having trouble with wide beam of my ultrasonic sensor
I need to measure and detect a gap between two objects. I have an MB7062 (maxbotix) ultrasonic sonar sensor. Due to the wide beam of the sensor (FOV in distance of 2m is about 30cm from the center ...
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Active thermistor giving skewed readings immediately when heating element turned on
For the purposes of experimentation and learning, I have constructed a circuit that uses a pair of 100 ohm 2 watt power resistors (in parallel for 50 ohms) to gently warm up a Microchip MCP9701A ...
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Humidity sensor HIH-5030 false readings on PCB
I've created a circuit (schematic below) to measure humidity with a HIH-5030 according to its datasheet and an ATtiny85 and tested it on a breadboard, the readings are very accurate.
Soldered on a ...
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Source impedance consideration for ADC
I recently used an accelerometer (ADXL335) in my academic project. This sensor has an analog output.
I interfaced this sensor with a microcontroller (PIC18F458) using an ADC module. It was ...
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Circuit Design for Eddy Current Sensor
I'm a research engineer working on a sensor for measuring electrical conductivity in ionized flames. There are a handful of works looking at this without much success.
The main approach outside of ...
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Making a light detector using a phototransistor and an open drain comparator
I want to make a light detector using a phototransistor. To do that I connected a phototransistor and apotentiometer to the open drain comparator as in the diagram below.
When the light is dim, ...
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Load Cell Bridge Resistances are ok but I cannot get reading from load cell
I have planar beam load cells that are not functioning. I bought a digitizer which was giving me a reading error which alerted me to an issue. So I unplug the cells from the summation box and I am ...
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LEM Sensor's output for current polarity change
I have a project where I'm trying to build a DC Drive, using just analog circuits. I'm expected to show the operation of the drive in forward and reverse motoring, and I'm trying to pick between the ...
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How to send data from a microcontroller to a database without WiFi? [closed]
I am currently working on a project utilizing a microcontroller along with a couple of sensors on a PCB that will be collecting data in backyards/outside. I haven't chosen my supplies yet, and I am ...
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How to read signal from Crankshaft Postition Sensor in motorcycle
I am trying to build digital tachometer for my motorcycle Yamaha FZS600 Fazer 2002. I have a problem with reading signal from CPS sensor. It is hall effect sensor, I suppose. I found the plug of it. ...
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Shift register (CD4021BE) 3.3 V on VCC and 5 V on inputs
I have a circuit with 8 sensors connected to a shift register (CD4021BE),
The shift register is powered by 3.3 V and the sensors outputs 5 V on the signal wire when triggered.
Is it allowed to connect ...
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Setting up a grid of IR sensors
I would like to design an nxn IR long range break beam sensors and place them on a table with receiver at one side and transmitter over the other
Length of the table is 155 cm and width is about 140 ...
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How to measure voltage with lifted ground?
simulate this circuit – Schematic created using CircuitLab
MCU1 is factory and I can't modify its firmware. I need to add a second MCU2 (ESP32) to control existing 4-20 sensor. Which ADC can I ...
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Problem with UART communication with a Pepperl & Fuchs UCC4000 ultrasonic sensor
I have a problem with a Pepperl & Fuchs UCC4000 ultrasonic sensor. This sensor communicates with UART protocol and has data transmit - receive based a kind of checksum encoding. According to what ...
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How can we say this current sensor doesn't measure DC?
Digikey is saying this current sensor "CS0305B" from CUI Devices can measure AC and not DC.
But in datasheet there is no reference or note mentioning this current sensor will not measure DC.
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Why am I getting 255 for all NPK values?
I am using a NodeMCU ESP8266 WiFi board for collecting N - P - K sensor data. I am using RS485 as interface.
This is the code:
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Any theoretical reference for empirical equation for estimating oxygen saturation (% SpO2 = 110 - 25*R)? [closed]
The empirical equation used to estimate % SpO2 is based on the observation that the ratio of the red and infrared light absorbed by arterial blood (represented by R in the equation) varies linearly ...
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I need help understanding this Python program for reading TDS and pH sensors on a Raspberry Pi 4B
I have a Python program for reading both TDS and pH sensors on a Raspberry Pi 4 and sending the data to the Blynk app.
I have a question about the code:
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Why do we ground the common probe on a 3 probe liquid level sensor?
I have a liquid level sensor with 3 probes, one us common, the other is for low level and the third is for high level. On the liquid level control relay diagram, I've noticed that the common probe ...
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Problem combining sensors with controller board
I found nice touchless sensors to detect water level and need to incorporate them with a control board that will pump water when the level is low and stop when refilled.
I got it figured out using ...
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Waveshare 10 DOF (C) IMU sensor outputs are inconsistent
I got this Waveshare 10 DOF IMU Sensor (C) from my workplace to use in a project but the demo code given in their site. After I uploaded the code to the Arduino UNO I have, the serial monitor outputs ...
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Reverse engineering a torque sensor
I am trying to reverse engineer a torque sensor. I have found the two data lines that are providing the torque value output to the ECU. Here are the waveforms that I have captured that show max. ...
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