Questions tagged [sensor]

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

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102 views

SPI vs Parallel interface for ADCs?

I need to use an ADC to convert analog signals from pressure and temperature sensors to a microcontroller (Teensy 4.0). I'm confused if I should use an ADC with Parallel or SPI interface. I'm ...
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41 views

What sensors and how many do I need to detect sounds and ultrasounds until 1MHz [on hold]

I need to detect and list all frequencies with an amplitude over a threshold, any detailed answer is welcome. Precision for range : Lower bound can be as low as 10-20 HZ, but my emphasis is on ...
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26 views

Mid-Infrared sensor cover (not PIR)?

I came across this great little sensor (AK9750), which can detect people in 4 directions with a good range of about 2 meters. However, its spectrum sensitivity is between 5000 and 7000 nm, which is ...
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39 views

Any recommendations for a water depth sensor? [closed]

I am participating in a project that requires the use of a sensor to record the depth of water environments. Looking online there are many sensors that record depth, but are not submersible. Does ...
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1answer
73 views

Measure benzene with an Arduino

So, I need to measure the concentration of Benzene in air. I have an Arduino Zero to read analog or digital value. I found out the sensor MQ-135. The problem is that, if I'm right, the sensor reacts ...
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2answers
24 views

How to connect multiple sensors to single PLC input?

Hello. I have a scenario where I have multiple PNP "error signal" from several sensors (let's assume 3 for now). If the sensor output is HIGH, then there is error. If the sensor output is LOW, then ...
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76 views

STM32H7 on-chip temperature sensor reading stable on 'Y' revision, but unstable on 'V' revision chip

using the STM32H753VIT6, I like to monitor the on-chip temperature sensor. The environmental temperature can become about 50 degrees Celsius, and the board is housed is a small plastic (DIN-rail) ...
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2answers
76 views

How do you avoid mixing CHASSIS GND and sensor GND when reading a sensor?

So I'm aware that in some systems they have different circuits with different grounds. For example, cars have at least a chassis ground and a sensor ground, and there is a measurable difference ...
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27 views

capacitive displacement sensor calculation

while studying this certain types of problems with capacitive displacement sensors I came across one in particular that I am pretty much stuck. The whole problem is explained in following text and ...
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1answer
113 views

Which one of these DS18B20 temperature sensors is fake?

A while back I bought two DS18B20 for half price, and today I bought another one for double the price. The part number on the cheaper one is printed while on the expensive one it's laser etched: On ...
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1answer
43 views

Help with understanding the Memory Map of MLX90393

(Using a Raspberry Pi 3 Model B+ and python) I needed some assistance in understanding the memory map of MLX90393 I've attached the memory map here and you could also find it in the datasheet. I'm a ...
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27 views

SEN0192 Microwave Doppler sensor sensitivity

I've integrated this doppler microwave detector to a raspberry pi 3 b+ and have been bench testing it -- and it works fine waving my hand in front of it. I've now moved it to the area where it needs ...
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2answers
67 views

Did I damage my temperature sensor?

The sensor is a DS18B20, I accidentally connected the positive and negative inverted to the sensor and it became very hot then I quickly disconnected the power. I don't have any other calibrated ...
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48 views

Is ok to use a CMOS Analog multiplexer with voltage from a sensor as an input?

So, I got an analog circuit with an IR sensor that generates a voltage in output. The voltage is a measure that must be read with a microcontroller (I use Arduino Zero). This is the sensor. As you ...
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1answer
71 views

Weird component in load cell Wheatstone bridge

While trying to repair a cheap digital kitchen scale, I came across this component (see picture below). AFAICT, this is 95% identical to the standard Wheatstone bridge interconnect for combining 4 ...
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1answer
55 views

Sensor to focus a robot on a welding line. (PLC robotics)

I'm searching for a way to recognize a welding line in an area. When the line is recognized, a small robot needs to follow the line. I searched the web already and spoke with some sensor suppliers. ...
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1answer
33 views

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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2answers
34 views

The lifetime of a WSN [duplicate]

What formula(s) should be used to determine the lifetime value of a wireless sensor node, charged up by a supercapacitor(its capacitance value its known), with a given power/energy consumption? It is ...
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1answer
30 views

3.3V very low power consumption buffer for sensor output

I'm designing a portable Ozone meter with an Arduino that read the data from the sensor and send it via LoRaWAN. I've found out this sensor that seems perfect for what I need. My device runs at 3.3V ...
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1answer
76 views

Struggling to find a sensor to detect water depth that suits my purposes

I am new to finding sensors and not familiar with good resources to find what I need, so the answer may be simple. I have a small tank that I am controlling the water level in. However, the depth ...
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1answer
72 views

Mixing two fluids dynamically using valves and sensors [closed]

I'm new to the field of electrical and electronics design... trying to build a hobby project for home decoration. I want to mix two colored fluids with proportion of each liquid decided by a user ...
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1answer
49 views

Hall element - Hall effect sensor identification needed (40 year old component)

Attached is a pic of a Hall element/Hall effect sensor from a 40 year old motor with PLL speed stability in the motor controller. The Hall sensor on top is the original. The new one below it is one ...
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1answer
17 views

send data to server using GET method and sim900a

I am trying to send my data to HTTP server using GET method. When i am sending some hardcoded data manually it is getting stored in database successfully. ...
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1answer
54 views

Writing extra data causing Arduino Mega 2560 to miss sensor data

I am working on a project that requires data from 3 different sensors and syncing is necessary. The first sensor(HX711) is relatively slow proving 80 samples per second. The second sensor(MAX30101) ...
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0answers
21 views

PLC Ladder Logic using LRXSW

I'm working on a project for a summer internship and was hoping for some assistance with PLC Ladder Logic. I have been trying for the last couple of days to program the PLC to do what I want but have ...
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1answer
27 views

Sensor to charge battery

I'm doing a project here. I'm designing my own generator using genset and motor to produce 12V of electricity. The main objective of my project is to produce a 12V from the generator. This 12V is ...
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2answers
81 views

Why SS and MISO of sensor is permanently high?

I have a brand new acceleration/giro sensor evaluation board which I want to interface with ESP32 via SPI bus. After spending few days trying to make it work, I have discovered that sensors SS(CSB) ...
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2answers
62 views

How to convert sensor signal to temperature from the data available from the datasheet?

I have a Pyrometer datasheet showing signal percentage (0 to 100%) with the corresponding respective temperatures (from 0 to 200 °C) and current values (from 0 to 20 mA) in the whole measuring range. ...
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1answer
52 views

Detecting radiation - Looking for ideas

I have to detect a small radiation from this tags and I´m looking for some ideas how I can do this with some kind of small electronic circuit (or lecture to read how to do it) - not with a Geiger-...
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1answer
41 views

Arduino / Love-O-Meter : wrong temperature read when LEDs are on

I tried the Love-O-Meter example given in the Startup kit of Arduino. The example is available here. The temperature sensor is the TMP36 given with the kit. If the three LEDs are off (e.g. when ...
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2answers
80 views

How can you estimate the final position of a gyroscope graphically?

A Smartphone is initially in the position indicated as follow We move it, and get the next gyro reading. How can you estimate your final position graphically?
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1answer
54 views

Hall sensor doesn't switch back when I move the magnet away

I am currently working with hall sensors and I found this difference between two sensors: The first one changes voltage when I approach and move back the magnet. The other one changes when I ...
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3answers
96 views

How to turn on LED with temperature sensor

I'm new to electronics and I want to control a device using a temperature as an input. Right now I saw this video on youtube and want to follow it as well as know what the components are for. https:/...
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5answers
221 views

Circuit to detect broken fuse

Consider the following circuit: [edited schematic] DC_gen1 and DC_gen2 are two +28V dc ideal generators. ...
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2answers
49 views

Troubles communicating with Pathfinder DVL without TRDI Toolz

Recently my team and I have acquired a Teledyne Pathfinder Doppler Velocity Log (DVL) that we are using for an AUV project. In the guide (found here: https://www.manualslib.com/manual/1447288/Teledyne-...
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0answers
31 views

What are the parts used in the pololu QTRX - RC sensors

I am making a line tracking device project, the number one important part of the device is the IR sensor itself. Now part of the project parameters is that it must be a single board and be only using ...
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2answers
25 views

MEMS piezoelectric sensor circuitry

I have a question what exactly does a MEMS piezoelectric sensor chip contain. Does it contain the sensor element alone (or) also the signal conditioning circuitry for the MEMS piezoelectric sensor as ...
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2answers
99 views

Optical measurement of CO2 with LED

This teardown of a personal weather station shows an LED which is apparently used for detection of carbon dioxide with an accuracy of +/-5% within 0-5000ppm: All the commercially available carbon ...
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1answer
64 views

ATMEGA328p powersupply 3.8volt and Sensor 5V input power

I have a little doubt. If I use a microcontroller powered by 3.7volt from a lithium battery and I want to connect a sensor that needs 5 volts of power(external). Can works the ADC of microcontroller ...
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2answers
61 views

How to read multiple I2C sensor (MLX90393) data on ESP32? [closed]

I am using MLX90393 Triaxial Magnetometer Sensors for my project. They communicate via I2C. I am using an ESP32 and coding on Arduino IDE. I found this code on GITHUB and was able to read from ONE ...
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1answer
46 views

JSN SR04 not giving correct readings when connected to ESP32?

When I connect a JSNSR04 to ESP32 and power it with USB of my computer, I am able to get correct readings. But when I power it with buckconverter for short distances ( <150) JSN gives correct ...
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3answers
74 views

Sensitivity (or responsitivity?) of an electrochemical sensor - Definition

I read a paper about an electrochemical sensor where there is the term sensitivity expressed in ampere. What is its definition? I found a IUPAC definition here, but the units are ampere/watt or volt/...
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0answers
45 views

Different number of bit for the ADC and DAC linked to a \$\mu\$controller - Electrochemical sensor

I am studying an electrochemical sensor (see figures below please) where the number of the bit of the DAC (Analog Devices AD5685R) is 14, whereas the number of the bit of the ADC (Analog Devices ...
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3answers
105 views

How does an accelerometer interpret g as ( +9.8 or -9.8 )

I am working with MPU6050 (accelerometer + gyroscope). Concerning about the accelerometer; Do these sensors(accelerometers in general) uses g as 9.8 m/s^2 or - 9.8 m/s^2 ? (Is there a standard/...
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3answers
44 views

How do piezoeletric accelerometer sensors generate output voltage?

How does piezoeletric accelerometer sensors work technically? I know that piezoeletric accelerometer sensors have a piezoeletric crystal, a mass and a spring. But where is the voltage at the ouput ...
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2answers
59 views

Understanding Responsivity of an IR sensor paired with a black body IR emitter

I'm building an air quality measurement system with the following components: IR Dual Channel sensor by Pyreos Axetris IR Balck Body emitter Reading the sensor datasheet I've seen there's the ...
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1answer
73 views

pH sensor voltage versus pH

I am currently in the process of making an ultra-low power pH captor and I'm running in a problem. The voltage I get from my pH probe does not fallow the Nernst equation (which states that the voltage ...
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6answers
184 views

Reflect IR beam off reflector instead of emitting straight to TSOP receiver

I have a working set-up to detect beam breaks using an IR LED, modulated at 36kHz, and a TSOP receiver connected to a comparator. It outputs the count via Arduino. The range is about the width of a ...
2
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1answer
39 views

Activating a relay when certain voltage received (Water injection system)

I decided to build a simple water/methanol injection system for my car and now I'm thinking about a simple way to activate the water pump only from certain boost level. For the boost reading I'm ...
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2answers
53 views

Split output of one temperature sensor to two independent signals using an op amp buffer [duplicate]

First off I am a car guy, if I have a schematic or details I can solder what I need. I have a client that fitted a digital temperature gauge to his car, he also wants to have the gauge on the ...