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Questions tagged [sensor]

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

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48 views

A sensor for jaw/mouth movements in a mask

The mask I'm trying to build will display different lighting patterns. The overall goal is to synchronize these patterns with a musical/dance performance, so there were two options: either hard-code ...
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How to detect many water balls pass-through a circle in the same time?

We got a request to design a counting circle. The radius of the circle is 45cm, and it will be used to detect water-ball (L: 8cm W: 3cm). I Googled a lot of ideas, everyone suggests using an ...
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38 views

PCB design for own customized sensors [on hold]

I am designing a PCB for my hobby things in which there are force sensors, some motor driver and connection for motors along with IMU on the PCB. So, my question is how can I verify that the sensors ...
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Connecting a resistive sensor to a BLE module

I'm trying to do a project in which I want to have a BLE module connected to a sensor(a resistive pressure sensor which has 0 or very high resistance based on whether pressure is applied or not) I ...
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1answer
37 views

Sensor fusion using IMU sensor

How to do the sensor fusion using the 4 IMU sensors. Here, 4 IMU sensors are used to know the location of every point where the IMUs are placed? I need the location of the every point on a 3D graph ...
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1answer
29 views

Understanding how to read output voltage of a current transformer sensor

I am try to understand how to read data from current transformer circuit. As reference i am reading on this 2 articles: Article1 and Article2. I do not have easy access to oscilloscope which make it ...
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1answer
42 views

What is the difference between the order LP filter + Op-Amp and Op-Amp + LP filter in practice?

I have issues explaining what really happens on my circuit. I'm trying to make a cardiofrequencemeter with a white LED and a phototransistor. Basically I light the phototransistor, and measure the ...
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1answer
35 views

Arduino to PC multi-sensor device

This us for a liquid-cooled computer or server. Is it at all possible to ”daisy-chain” (possibly not the right term) multiple Arduino boards together for the following inputs? Multiple different ...
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46 views

Magnetic sensor preamplifier using op07

I am using this circuit to amplify a sensor signal (220mV p-p) to about 5Vp-p and measuring by microcontroller ADC: When I connect the input signal, the input voltage level goes up (changes from ...
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1answer
52 views

Detecting movement of a mechanical ring using optical sensors

I need help deciding on which sensor to use for my current home project. Basically I'm trying to replicate the Numio Control but at much cheaper cost. If it is successful I will publish the result ...
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1answer
30 views

Need help interfacing an ADC with a pressure transducer

I am trying to connect a pressure transducer which gives a 4- 20mA current output to an ADC which I believe can only take voltage inputs. How will I be able to read a current output from the ADC? Do I ...
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23 views

I need soil moisture sensor suggestions for my project [closed]

I have to measure soil moisture in my project. It should be as cheap as possible because i won't use only one soil moisture sensor. The most common sensor is this: Soil Moisture Sensor I learned that ...
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1answer
37 views

MLX90632 eeprom write problem

I am using an MLX90632 (MLX90632-S-LD-BCB-000) infrared temperature sensor to build an application which reads an object's temperature among other things. MLX90632 manual The MLX90632 comes with a ...
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4answers
361 views

Limiting sensor input voltage without biasing measurement

I need to measure precise voltage in the range from 0.375 volt to 10.1 volts from a source with 100ohm impedance. Maximum voltage however, may be well above 10.1V, so I need to be sure I do not ...
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2answers
43 views

Choosing a current sensor based on mV per amp

I want to measure AC current with an Arduino-type device. I am currently selecting a current sensor. A 10 bit ADC gives 1023 points. At 5v that is 5v/1023 = 4.9mV A current sensor with 185mV/A thus ...
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Calculate water pressure sensor current consumption

I have a Analog Water Pressure Sensor but I don't have tools to measure the current consumption or simulate pressure level in the sensor. How can I estimate the current consumption when the pressure ...
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1answer
18 views

LSM303CTR 3-wire SPI and I2C - conceptual problem

I'm trying to interface LSM303CTR e-compass from ST-microelectronics with microcontroler. Due to design limitations I have to use 4-wire SPI. This MEMS device has option to switch beetween 3-wire ...
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1answer
25 views

Read Data from Temperature Controller using MATLAB, Need Help

I am trying to read data from a temperature controller called ATR-401 using MATLAB's tool box called Instrument Control Toolbox but every time i try to read data from it i get an error "A timeout ...
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2answers
67 views

Reading data from Pressure Sensor

I am having trouble reading data from a pressure sensor using MATLAB. The pressure sensor is connected to an NI 9219 Analog Input Device. Firstly, i tested the device to make sure it is working using ...
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1answer
95 views

Does a robotic lawn mower sense that it is outside the perimeter wire? If so, how?

I have a robotic lawn mower. Sometimes if the grass is really slippery, the lawn mower can slide outside of the perimeter wire. When that happens, the lawn mower shuts down and I get a notification on ...
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1answer
89 views

Arduino Mega2560 as power source of 2W

I have a sensor which requires 24V supply voltage and 2W power consumption. So, my plan is to use Arduino Mega2560 for power source of this sensor. First of all, I would take MT3608 DCDC converter to ...
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2answers
69 views

Submersible electronics

I'm currently working on a hobby project that uses a MS5540C. It will basically measure the water depth and temperature. My general thinking was to encapsulate the whole thing (except the sensor) in ...
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1answer
49 views

Safety Rated Sensors [closed]

I am trying to find a safety sensor for a machine. The sensor should be safety rated as it will be used to detect if a cover is removed and will shut down robotics and uvc bulbs which is harmful to ...
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1answer
137 views

Is it possible to use an accelerometer as a route finder? [closed]

I have an ESP8266 and an accelerometer (MPU6050.) When I place the accelerometer with ESP8266 in my gadget, is it capable sensor to draw the path of gadget travel (means to get the co-ordinates) ...
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1answer
43 views

Unable to read data from MCP9808 using i2c

I have a MCP9808 temperature sensor and a Raspberry Pi 3B plus. I had great success reading the temperature from this sensor via i2c on an Arduino Uno, but am not able to read the temperature with ...
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2answers
38 views

How to read current from a non invasive split core transformer AC current sensors

I was looking for a simple AC sensor and found this. It would seem to be a good option since it is not invasive. The problem is how do you read data from these type of sensors? Im having a hard time ...
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2answers
58 views

Why not specify the z axies in module pcb?

I have a 3 axis Accerelometer (MPU6050) PCB, but the indication in PCB tells it has only X AND Y axis rotation, why??
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25 views

Hall IC current sensors can work for positioning measurement?

I recently posted a related question but this question seems to be requiring its own thread. There are available closed loop Hall IC current sensors which detects currents passing through conductors. ...
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35 views

Magnetic Linear Positioning with no magnetic disturbances at all

I recently saw a machine where it used a hall sensor or a magnetometer for linear positioning (the sensor is wrapped in some opaque protection so I don't know what it actually is which is the real ...
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1answer
41 views

How do I connect a bno055 chip to a Linux pc via an FTDI UART breakout sensor?

I want to create a C++ (or C) program that reads in a stream of Quaternion data from the bno055 Adafruit chip. My set-up at the moment has an Ubuntu PC as the controller. Plugged into the PC is a ...
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1answer
72 views

What type of sensor to detect if an object passes through?

(Sorry for my bad English) Hello guys, I need your help since I have no idea about electronic stuff. I have a table soccer and want to install motion sensors in the goals, so whenever the ball ...
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1answer
76 views

Practical considerations using Ethernet bus for a large number of sensors?

I understand that an Ethernet bus design with hubs has largely been superseded by star topologies with switches and that is largely due to the issues of collisions. However, I am interested in ...
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3answers
114 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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28 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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1answer
78 views

Measure benzene with an Arduino [closed]

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
27 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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88 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
77 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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2answers
147 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
57 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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32 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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49 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
56 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
39 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
32 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 ...