Questions tagged [sensor]

Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

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Camera sensor OV5642

I'm currently looking to replace an OV5642 camera sensor with an alternative where I could use the same private software that belongs to a different owner. I came across the OV5640 sensor, but the ...
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Hydrogen flow sensor [closed]

I want to measure flow of gases specifically, hydrogen gas. I want to be able to control the flow using a microcontroller like increase/decrease flowrate etc. I also want to measure pressure of the ...
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Multiple A/D Converters reading from the same sensor in a race car

I have a production based race car and my goal is to log the outputs of some OEM sensors used by the Engine Control Unit with an aftermarket data logger without risking any impact to the OEM function. ...
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Removing 0A offset voltage from current sensor

I would like to use the CUI CS0312U current sensor in my application where its output voltage is fed into a non-inverting Schmitt Trigger circuit to realize a simple hysteresis current controller. A 1 ...
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Connect analog sensor to PLC Omron CP1E-E30SDRA

I have a Wisner pressure sensor 0-10 bar with output 4-20 mA. I want to connect it with PLC Omron CP1E-E30SDRA which this PLC doesn’t have any analog input pin. I want to use this sensor to maintain ...
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Resistive Moisture Sensors, What is the purpose of the 2N3904 Transistor in the Sparkfun Circuit?

the two circuits below do the same things as far as I can tell, they both measure soil moisture using resistive sensing. However the one from Sparkfun is using a 2N3904 transistor, since the voltage ...
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-4 votes
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In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m?

In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m? https://ibb.co/c3X1NRS
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Grounding sensors to large bodies

I've attached a diagram of what I'm talking about. I have a large (600x300x10 mm) aluminum block in which I place thermistors to monitor the temperature distribution in the plate (in a standard ...
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GMR Sensor voltage output into magnetic field

I used a GMR sensor (Model AA003-02) inside a electricly adjustable homogenous magnetic field generated by a long coil. In other words the current is proportional to the magnetic field strength. ...
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How to simulate non-invasive blood glucometer in Proteus?

I'm working on a project in which I'm trying to create a non-invasive blood glucometer using NIR light and a photodiode. The glucose level is determined by the amount of light absorbed by the blood, ...
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Surface scanning

I’d like to build a bowling ball surface scanner as a home project. Similar to a CD player using a semiconductor diode laser and a small photoelectric cell to read the surface. I would like to read ...
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Why does the Arduino give me a value of 1023?

I'm using an EMG sensor V3 from Advancer Technologies connected to the A0 pin of an Arduino Uno 3. When I read data from the sensor it always shows 1023 values. What is the reason for this? I used a ...
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Temperature sensor noise

I am trying to model a temperature sensor in Simulink. I have a question regarding the modelling of the temperature noise. I was thinking of modelling it as a band limited white noise, but I am unable ...
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BLDC Hall Sensor Angle Offset

I'm running a BLDC motor and I'm working on my own Software. I want to run the BLDC Motor with field oriented control, that's why I need a precise electrical angle. I'm using three hall sensors in the ...
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4-20 mA Sensor to Raspberry Pi: Inconsistent readings

I have a 4-20 mA sensor that I want to read it with a Raspberry Pi. I use a DFRobot Current to Voltage converter board connected to an ADC (ADS 1115) that is connected to a Pi. So that way I can read ...
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Feasibility of humidity controlled minifan part 2

Previously, I asked about the type of input that I should employ in my project which is a humidity controlled minifan out of a humistor, and I considered using DC. Now I'm asking how construct the ...
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Powering esp32 via v5 influences ds18b20 working (which is powered with 3.3v)

I'm running a wire of 12 ds18b20 sensors on a esp32. The wire (utp5 cable) is 1m to the first sensor, and then 15cm between every sesnor. Power via 3.3v pin of the esp32 (wroom32 dev board) a resister ...
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1 answer
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How to read four load cells with a single ADC input?

I am currently using strain gauge based load cells and want to weigh 1-5kg granular products on whatever container with 4loadcells beneath. I encountered a problem with connecting load cells in a ...
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14 votes
4 answers
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Does each IC need its own bypass capacitor when there are multiple ICs in the same circuit?

I am working on a circuit to measure the current drain of six hobby servos for a robotics application. I'm aiming to use six ACS712 current sensor ICs. The ACS712 data sheet shows a typical ...
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Could my choice of cable be why my DS18B20 sensor isn't found?

I'm building a project with the DS18B20 temperature sensor and a Raspberry Pi (among other things) This temperature sensor needs to be a little distance from my Pi as it is an weatherproof external ...
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Sensor - Use level shifter or not?

I try to design an electronics with a VL53L1CXV0FY/1 ToF sensor. The uC has a logic level of 3.3V and the ToF sensor seems to have different logic levels, but I'm not sure what I should choose. ...
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1 vote
1 answer
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Undesired and unstable rise in output read voltage of sensors when more components attached to Arduino circuit [closed]

I am making a project which has one air pump run by a L293D motor controller, a few solenoid valves running at 6 volts, and sensors. The air pump and the valves are powered through a 6 volt adapter. ...
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1 answer
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Accuracy Class and Full Scale

I am using this formula to calculate the class of an instrument: \$\text{Accuracy Class} = \frac{\max{\text{(Absolute Error in Range of Measurement)}}}{\text{Full Scale Value}}\$ The question is, FSV ...
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1 answer
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Help with AVR ADC and Serial port programming and integrating with python

I am a 2nd year electrical engineering student. I was stuck at this: Why do both seven segment displays show only 8 even when simulation is not running? Basically I am trying to take temperature data ...
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Sensors to monitor elevation changes

I am looking for a sensor that could accurately measure elevation changes from a static benchmark location to dynamic location. Ex boat dock is the benchmark and the boat is equipped with a sensor. If ...
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2 votes
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No current changes using INA219 to reading industrial sensor

I intended to use the INA219 chip to read the 4-20 mA current loop of the industrial sensor for the automation project. the sensor voltage is 12 V, my first schematic was as follows: The ground of ...
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Omron PP02 sensor signal issues

I am using omron PP02 pressure sensor for my sphygmomanometer project. The data sheet is here DataSheet Link, and the user manual is here UserManual Link. I "believe" I have correctly wired ...
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Analog sound data

I tried to make my own sound sensor on a PCB. I wanted to take analog sound data for my project. I used an ADC pin from a STM32G474, but I maded mistake while I designing. I took a KY-038 reference ...
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How to connect a 2 wire current sensor to a 3-wire set-up?

At the moment I have a couple of 3 wire current(4-20mA) sensors inside my setup that have the same connection as the schematic below. One of the sensors has broken. We can not directly get the same ...
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1 answer
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How can I synchronize load cell and sensor for sensor calibration?

I have made a glove with some cheap pressure sensors with weight ∝ 1/resistance. DESIRED OUTPUT I now want to create a dataset with columns "Actual Weight" and "Glove Sensor Readout&...
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Detecting IR reflection of shiny sphere from a distance

I have a ball rolling along a grooved track and need to determine its speed. Typical speeds are in the range of 2-20 m/s. The balls are relatively shiny (think polished bowling ball.) A common ...
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How to connect one digital/analog sensor to two separate devices?

I have an ifm electrical pressure sensor witha 3 wire sensor cable which is currently connected to an ifm IO-link master for receiving signals. I want to make a parallel circuit to connect the sensor ...
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1 vote
1 answer
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Active filter for low capacitance AC coupled input

I need to interface an AC coupled sensor with rest of my system. The sensor I am working with produces approx. 10V peak with 10V of DC offset but it has a very small series resistance about 50fento. ...
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1 vote
2 answers
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What happens if you go below the minimum common mode voltage of a current sense amplifier?

This might be a simple one, but I can only seem to find information on going above the common mode voltage (VCM), not below it. Obviously going above the VCM upper limit will damage the device. I'm ...
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How does temperature compensation work for pellistors in Wheatstone bridge?

Pellistors are used to detect combustible gases. Basically, the gas is burned inside the pellistor and the heat released will change the resistance of the detection element. The concentration of the ...
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1 vote
1 answer
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Reading timestamp from FIFO in LSM6DS3

I using an LSM6DS3 sensor in order to estimate motion and derive. For this purpose I am reading X,Y,Z acceleration values computing linear acceleration and using a time component to derive speed and ...
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-1 votes
1 answer
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Wheatstone Bridge integrated circuit chip [closed]

Is there anything like a wheatstone bridge IC in various resistances with pins to hookup the fourth resistance , and other connections ?
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Underwater distance measurement

I am working on a University project on ROV that needs an underwater distance measurement of about 50 cm min and 2 m max. I tried looking for sensors and came across jsn-sr04t but that doesn't seem to ...
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4 votes
5 answers
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Turning a high/low signal into a proper digital signal

High school electronics student here, so sorry if this is a simple question. I have a photo-electric sensor that I currently have hooked up to a microcontroller. When on, the digital input it always ...
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5 votes
1 answer
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Why am I getting inconsistent voltages at op-amp's inputs in a simple DC amplifier?

I'm new to circuit design and am unable to figure out why I'm getting inconsistent voltage measurements under certain circumstances at the inputs of an op amp in a very simple non-inverting DC ...
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3 answers
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Measuring angled surface with LIDAR

I have been trying to create a sensor that detects when a golf club hits a golf ball. My idea was to have a LIDAR sensor continuously poll the head of the golf club, and return a positive indication ...
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1 vote
1 answer
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Vl53l0x ToF Sensor turn on without gnd

My ToF sensor turn on if I not connected its ground pin to common ground (I let it float). Why?
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2 answers
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Bypass touch sensor IC with a button?

I want to replace a capacitive touch sensor on a circuit board (I think it’s a TTP223) with a tactile switch to overcome over/under sensitivity issues. I have wired a switch to ground and the CMOS ...
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0 votes
1 answer
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What kind of sensor is this

While cleaning up some old stuff in my garage, I just found this thing, that I assume is some kind of sensor: I probably fetched it on some equipment, but that was probably a very long time ago, I ...
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Correct drift from IMU with magnetic sensor

Is it possible to correct the drift from the IMU by setting an external magnetic sensor as the reference point (zero) of the magnetometer in the IMU. For example, tracking the position of the wrist, ...
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-1 votes
1 answer
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Current mode vs Voltage mode signal conditioning [closed]

I am working in sensor design and would like to compare the signal conditioning of current output sensors vs voltage output sensors about advantages and disadvantages of each. Can some one point out ...
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1 vote
2 answers
198 views

MPX2100DP differential pressure sensor with Arduino

I am trying to use a pressure sensor which is MPX2100DP. Datasheet is; https://www.nxp.com/docs/en/data-sheet/MPX2100.pdf My goal is to measure the air pressure inside a pipe. First of all, I tried it ...
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2 votes
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Will a 4-wire resolver work?

I am not an EE. Most resolvers I come across have 6-wires: I have even come across 5-wire resolvers. Could we get this down to 4 wires? For example, an RVDT (Rotary Variable Differential Transformer) ...
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1 vote
2 answers
77 views

Sensor output resistance

I want to design a circuit using a Hall sensor (reference is SS49E, see datasheet). I want to size the output resistance of the sensor. The block diagram of the sensor is: The output current of the ...
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Single Phase Hall Effect Fan Driver - how to use this part?

During the search for some sensor, I stumbled over the following part (MA477M) and I was wondering how exactly it would be used. It is called "Single Phase Hall Effect Fan Driver". How would ...
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