Questions tagged [sensor]
Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
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How to determine delay of sensor response after the stimulus event (with oscilloscope?)
I’d like to determine how long it takes a digital sensor to go low after the stimulus event (Ir break beam). I have no problem getting a trace from sensor: I can see it start to drop, the slope, ...
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HealthBand Project - Good Alternative to ME6206A18M3G 3-pin Voltage Regulator (LDO) [closed]
So the context here is basically I am simulating the Breakout Board Circuit of MAX30102 and want to integrate it onto the PCB Board. I am planning to build my own opensource type of Healthband that ...
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TC1046VNBTR: Temperature Sensor output has an oscillation
I am utilizing the Microchip TC1046VNBTR on my PCB to measure ambient temperature of the board. I am trying to get a reasonably accurate reading (2-3 °C accuracy). I am using a basic setup based on my ...
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I am developing a microwave-based sensor. I need to find its max range for detecting the object of interest. How can I find it? [closed]
I tried preforming radar cross section (RCS), but how can I use that output and find the max range the sensor will be effective?
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Would a Hall effect sensor be damaged by gross saturation?
There's this old question that is almost what I'm looking for, but not quite.
I want to make a current direction sensor - I don't care about magnitude - for a car starter battery. I care about the ...
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S11108 CMOS linear image sensor not working
I'm looking for help/advise working with a S11108 is a CMOS linear image sensor. My son is studying computer science at university who has been helping. We are using the S11108 to scan a moving ...
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How to simulate Hall sensor output on clutch to enable remote-start of vehicle?
I love tinkering with electronics but never been good at the math so didn't take it any further growing up.
So basically I want to install a remote start on my van and need to temporally disable/trick ...
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TLC4502ID with PH sensor
I'm using TLC4502D IC to amplify the PH sensor output as in the diagram. It was observed that the output is lower and not constant( not converging) for the same PH sensor probe when I tested with ...
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Latching relays for a water pump with two XKC-Y25 sensors
I have a tank with a water pump. I want to use two XKC-Y25 water level sensors to fill the tank, one sensor for the high level (let's call it SW1) and one for the low level (SW2). The sensors provide ...
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Constructing a Redox Probe using an arduino
I'm trying to design an ORP that can be used to measure the total voltage of a solution. This solution would be a NaCl solution that's mixed with water that can be anywhere from 0 to 5000 ppm of NaCl.
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Circuit Design Explanation
Can anyone tell me how this circuit will work? I have a AI (analog input) 0-10 V / 4-20 mA and a AO (Analog Output) 0-10 V. I only have one IO pin from ESP32 from which I will use to get AI from a ...
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Register address offset of a 16-bit register
I was reading a document and they said the address of the SAVE register is 0x00 and the address of the CALSW is 0x01. However, each register is 16-bit wide, so the address of the CALSW register must ...
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Is it better using NTC or a proper temperature sensor?
I need to sense temperature for a lithium battery pack and a TO-220 package transistor. Would an NTC with voltage divider be ok or is it better to use a sensor like the LM36?
Note:
Measured ...
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PCB design around HTU21D and HTU31D temperature sensors
I'm currently designing a IoT device based on an ESP32. This one comes on a mainboard where HAT could be plugged in (nothing new here).
The current HAT I'm working on is a temperature and humidity ...
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How to connect MPU-6050 gyroscope pins?
I want use MPU-6050 in one of my projects. I have problem with some pins of this sensor.
CLKIN: What is this pin? I connect one oscillator with jumper and pull-down this pin. Datasheet say ground it ...
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Why is there a potential difference between VCC and Output pins of A3144 hall sensor?
When we bring a magnet near the A3144 sensor the PD between output and GND goes to zero but how come does the PD between output and VCC becomes equal to the PD of VCC and GND. Also when the magnet ...
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How to connect LIS3DHTR accelerometer pins?
I want use LIS3DHTR in one of my projects. I have problem with some pins of this sensor.
ADC pins: I want to connect some sensors with wire to jumper, is it OK? Datasheet said we can connect ADC pins ...
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How can I limit the active working angle on a microwave motion sensor?
I have a microwave motion sensor that can be triggered in almost every angle.
I want to limit its angle of view to only one side of the board but so far I had no success.
What I have done:
Designed ...
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Reading a resistance to earth sensor with a microcontroller
What are the options for reading a resistance to earth sensor from a microcontroller?
Scenario: I'm building a digital dash for a vintage car, using a Teensy 4 as the microcontroller. The car is a ...
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Piezo Transducer RX/RX switch with a charge amplifier
I'm trying to design a circuit that can both transmit a 40kHz square wave and receive a 40kHz sine wave using the same ultrasonic piezo transducer. Switching between them doesn't have to be very fast (...
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Linear actuator doesn't move or moves very slowly
I am observing issues with linear actuator not moving and/or moving very slowly at highest speed setting. I am using a DC linear actuator with a speed control unit and rocker switch to extend and ...
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What is the best practice to translate variable resistor 500k to infinity to logic levels?
I have a custom sensor that gives me resistance in the range of 500 kΩ to infinity, I want the 500 kΩ - 1.5 MΩ values to be perceive as a High input in my STM32 controller.
Assuming Vin = 3 V and the ...
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10 µA sensor excitation
I need to measure cryogenic temperatures using a silicon diode type temperature sensor. This has a 4 wire interface. Two wires for a 10 µA current excitation for the sensor and 2 wires for the voltage ...
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Linearizing hyperbolic magnetic Hall sensor response
I am working on a project where I need high precision measurement of distance using a magnet and Hall sensor. The response is similar as in the graph below, meaning that the voltage changes much more ...
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Confusing terminology? [closed]
I posted this question at motor vehicle stack exchange but I believe it's more suited for this.
I've noticed that many computer errors (diagnostic trouble codes PXXXX) in cars use confusing ...
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Range problems w/ Sharp IR Distance Sensor
I've been struggling to properly measure distances with a Sharp IR Distance Sensor GP2Y0A21.
Despite the sensor being rated for distances of 10-80 cm, I've found that after about 30-33cm, the sensor ...
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A low noise multiplexer
I am trying to make Faraday's cups array sensor, in which each signal coming from the cups must be amplified because it is too small (microampere or even lower).
But since I have too many cups, I need ...
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OPT3001 - Read before Conversion in complete
What will happen if Light Sensor - OPT3001 conversion time field is set to 800ms but read request is set every 100ms. Unable to find/locate the info in Datasheet.
Additions Info:
Transparent hystersis ...
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Thermal Conductance of a Pyroelectric sensor
For some temperature changes, I want to use a pyroelectric sensor. I have been looking for the R.G. Whatmore's papers for the basic theory. In the paper, for calculating the time constant. He ...
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Piezo sensor at resonance - equivalent model
piezo materials are commonly modelled with the BVD model
When the piezo is used as a sensor, they are commonly modelled as a current source in parallel with a capacitor because à external force ...
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How to tell if a motor is slightly jammed?
I am trying to use a motor for an application that requires sensitive handling of playing cards (a card shuffler). The main objective in this case is not speed but control. The most important thing is ...
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Incremental Encoder problem
I have a problem is that it is not possible to specify the direction of rotation in the encoder. Refer to it as in the attached picture.enter image description here.
The problem with the selection is ...
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Copying other module design to my PCB?
I'm designing a PCB in which I would be using an Arduino microcontroller. On the same PCB, I want to add an MPU6050 sensor. But the problem is that I am not sure how am I gonna be connecting it ...
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What is Interrupts in ESP32? [closed]
I am working with ESP32 WROOM32 Controller and AHT25 Temperature and Humidity sensor. I need to work with Interrupts in my device. Basically I don't know what is interrupts and How to use my device ...
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I2C VS SPI for ultra low power design
I'm in the process of designing a low power sensor system. It is composed of an ultra low power ARM MCU and of 2 low power sensors.
The 2 sensors can communicate either via SPI or I2C. I need to ...
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PVDF film to record high speed dynamic force
Do you know if TE Connectivity's PVDF films can be used as sensors for measuring high-speed impacts? The frequency range of the signal to be measured is between 3 kHz and 500 KHz. However, there is no ...
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Biasing phototransistor for homemade Reflectance sensor
I need a reflectance sensor like the TCRT5000 for a project I'm doing. The sensor should detect the transition from a dark surface to a white surface.
I have infrared LEDs and phototransistors and ...
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How to interface 6 HC-SR04 ultrasonic sensors to Raspberry Pi 4
I am a beginner to Rasberry Pi and working on a parking warning system for a go-kart. The plan is to use 6 ultrasonic sensors (3 at the front of the kart, wired to one of the breadboards, and 3 at the ...
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WT901 How to make sense of Euler angle
I'm trying to make an angle sensor using the WT901 Attitude Angle Sensor
All I'm looking for is the angle of gravity relative to the Z axis of the device (which I believe is normal to the PCB surface)....
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CO2 sensor module MH-Z19 doesn't give a proper value on Arduino Nano
What I want to achieve
Use a CO2 sensor module MH-Z19C to detect CO2 in the room using UART with Arduino Nano.
Issue
The sensor gave an unreasonable value 0 ppm. Generally speaking, CO2 in the air is ...
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Temperature sensor on a long wire (100ft) [closed]
I'd like to monitor the temperature of a variety of locations around my house but I don't want to rely on wireless technology. Are there temperature sensors that can be connected over long distances (...
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SGP30 circuit not working
I am building a PCB to show environmental data on a led matrix. Everything works perfectly except this SGP30 sensor I am using. It gets detected, but only sends default values at all times. I have ...
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Accelerometer and trigger values
For my application I want a accelerometer to trigger on set threshold changing values. The application is attaching the accelerometer to a ball and turn-by-turn smash the ball into the ground, trying ...
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MSP430 I2C communication no ACK
I'm trying to get I2C working with the MSP4302231 and had and still have some problems. The main problem is that I don't get an ACK from the slave to which I send its address on the I2C bus. Noticed ...
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Why does IMU acceleration bias increase with increase in acceleration?
I am trying to estimate the wheel speed scale factor of a vehicle. I find that whenever the vehicle accelerates rapidly,the estimated speed is lower than the true speed. In other words, I see bias in ...
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Basic bench wiring of an A3144E hall sensor
I'm trying to build a tachometer using a hall effect sensor which will later be an input for an Arduino. At this stage I'm still just bench testing the sensor. I bought the sensor on ebay, the listing ...
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What is this light sensor part?
This light sensor off of my lincoln town car stopped working. It is supposed to turn on/off my headlights when it is bright enough outside. I don't know what this part would be and would love some ...
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Ripple on operational amplifier output
I have a circuit made of a sensor whose output is subtracted by a number and then multiplied. I do this with operational amplifiers:
U2.2 subtracts 3.3/2 volts from the sensor output. This is then ...
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How to best detect drop of small (2.4 mm) glass ball
A previous student built a measurement setup, which involves dropping a small sphere (2.4 mm) onto various surfaces to measure rebound characteristics.
As it falls it will (partially) interrupt a red ...
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How do you create small devices that can remain "dead" for a very long time without damaging the battery?
I'm working on a product that uses a very small 20mAh lipo battery. The device only needs to operate for 8 hours, and that's not a problem. However, I expect that customers may run the device until it ...
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