Questions tagged [sensor]

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

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2answers
17 views

VIH of digital selection inputs for analog Mux when supplied with 4096mV - CD4051 IC

I will use CD4051BM96 part number, DATASHEET On page 7 is shown specs of VIH. It shows VIH of 3.5V for 5V supply (this 70% of VDD), VIH of 7V for 10V supply (70%) and VIH of 11V for 15V supply (73.3% ...
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1answer
37 views

Melexis sensors how to get PWM output?

The Melexis MLX90372 datasheet says that it can output either SENT protocol or PWM. I do not see anywhere in the datasheet how to put it into "PWM Mode" as they call it. Nor do I see how to ...
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42 views

Is there a non-contact temperature sensing technology that can measure the temperature of something emersed in water/other liquids?

It's pretty much all said in the title... I want to get the temperature of a surface that my device is moving past. The surface may be as cold as -55°C. I was thinking about non-contact thermometer ...
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2answers
48 views

Voltage divider for a voltage range spanning negative voltages

We have a sensor giving out a signal between -10 V and +10 V, and a signal acqusition device that only accepts voltages between -2 V and +2 V. So we need to scale down the signal into the smaller ...
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2answers
61 views

Sensor for Weight Measurement

I want to measure weight of some objects which range from 50 grams to 20 Kg. So what kind of sensor should I use to get values with a precision of 1 gram. I tried a strain-gauge load cell of 20Kg, ...
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2answers
75 views

Reflective Optical sensor

I am working on a project that uses TCRT5000 reflective optical sensor. Sensor datasheet is here I tested this sensor in a room, the voltage at the output pin is high it is above 2.5V. while showing ...
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2answers
37 views

Can eddy current sensors measure through a thin metallic sheet?

I would like to know if it is theoretically and technically possible to measure/detect a metallic object through a thin metal sheet using eddy current sensor. For example copper has a skin depth of ...
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1answer
17 views

Use NRG sensors - Anemometer (low level AC sine wave) and Wind Vane (analog DC voltage) with ESP8266 or ESP32

I have set of sensors NRG #40C Anemometer: Output signal: Signal type: Low level AC sine wave, frequency linearly proportional to windspeed. Output signal range: 0 Hz to 125 Hz Output voltage at ...
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1answer
27 views

How calculate the error offset or the noise threshold for MyoWare and FSR sensors?

I am working on EMG and FMG signals to extract time domine features and i need a threshold value for some features. I must calculate it from the characteristics of MyoWare and FSR sensors.For the ...
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2answers
46 views

Smoke calculation with mq2 sensor

How to calculate the amount of smoke output from the mq2 sensor?
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0answers
36 views

sensor that can detect resistance variation [closed]

Can anyone please suggest a commercial sensor that can detect resistance variation. I want to keep two parallel lines across two conducting wires, one with a fix resistance of ~10 mega ohm and another ...
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5answers
81 views

Capacitive Switch To Distinguish Between Metal and Plastic

I have an application where a rotating plastic wheel has ferromagnetic inserts on the circumference of the plastic wheel (they don't stick out). Shown below in the picture is the plastic wheel (black)...
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1answer
36 views

Question Regarding Capacitive Sensor IC

I have this Capacitive Sensor IC I am trying to understand and analyze how to use this IC. In the datasheet, on page 13 - Function description, it is mentioned as "There are four selectable non-...
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0answers
42 views

Hall sensor square wave output

I have a question regarding the SS411 sensor. I have this sensor mounted on a BLDC motor. The magnets (neodymium) are placed with 0.02 mm precision. When spinning at a constant RPM, the sensor output ...
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1answer
38 views

CNC feedback mechanism

The GRBL library for Arduino looks very comprehensive but I like to understand how things work before I try to build them. Something I don't understand is how these systems get positional feedback. I ...
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1answer
44 views

CNY70 from 5V to 3.3V

I have CNY70 connected this way: And I need to determine the value of R2 for OUT to be from 0V to 3.3V. I don't know how to calculate it, please help. EDIT: Input is the 5V and output goes to ...
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1answer
44 views

Accelerometer wiring

I try to connect an EVAL-ADXL345Z-M (Data sheet) to an adafruit-feather-m0-adalogger (Data sheet). 4 wire SPI is desired. Is it correct to connect it like: ...
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1answer
36 views

Automotive Sensor Output

Why does the automotive industry sticks with 5V sensor outputs instead of something like 4-20 mA? Wouldn't it be a solution less prone noise? What are the advantages in using a 5V output instead of a ...
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0answers
59 views

What technique( Ultrasound / Infrared ) should I use to detect seeds inside a fruit? [closed]

This fruit is simplistic as there is a thin skin surrounding it. Inside it is a tiny ball of liquid and that is where the dense seed forms. The is seed much more denser in comparison with the liquid ...
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2answers
158 views

What are the two sensors doing in the automatic bread production line? [closed]

I want to know what is the name of these 2 sensors and what function they perform Some of you were complaining about the picture quality. It is the highest quality image I can get. Also these sensors ...
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1answer
33 views

Question about capacitive sensor designs with direct touch to copper or aluminum

I've seen some DIY capacitive touch sensor projects where the sensors themselves are strips of aluminum or copper soldered to a non-grounded wire, where the user touches these strips directly with ...
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1answer
37 views

Can the capacitance of a proximity sensor be increase by adding layer to the capacitor?

Would adding layers to the capacitor of a proximity sensor from lets say 1 (A) to 4 layers (B) help with increasing the capacitance and at the same time the distance that can be sensed with a ...
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0answers
60 views

Divide by 2 for “wasted spark” motorcycle rev counter input [migrated]

My motorcycle just got an upgraded ignition timing method. This new method fires the spark plugs twice each cycle which in turn increases the RPM * 2 according to the tachometer. Is there a way to ...
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1answer
60 views

Thermopile temperature sensor

I am using an MRT511 thermopile temperature sensor. The datasheet shows a R-T table. I measured the resistance between 2nd and 4th pin of the sensor and voltage by using a voltage divider circuit. It ...
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1answer
47 views

Interpreting pinout and the transfer function for this sensor from its datasheet

I have this pressure sensor with the following details from the datasheet: The diagram for connections is given as follows as Vsupply, GND and Vout: But the chip has 6 legs and described as follows: ...
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3answers
46 views

Different outputs of a sensor in its recommended load range

I want to use this sensor by using 5V supply voltage and I do the connections as shown in its datasheet. According to he data-sheet the minimum load is 80k which means I should use less than 80k. But ...
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2answers
46 views

How to obtain the transfer function of this sensor?

How can I obtain the transfer function(voltage to RH(%)) of this ratio-metric sensor by using the following data?: The Vsupply might drift so I also need to include it in the equation.
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4answers
544 views

Measure distance using an ultrasonic sensor in a pipe

I am trying to find the distance of an object in a pipe, but I am getting wrong values using the ultrasonic sensor with an Arduino as the sound is bounced back from the surface of the pipe. What do I ...
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1answer
43 views

How do I reduce the time delay in the HC-SR501 motion sensor?

I have integrated this sensor to trigger a water pump to dispense water/ sanitiser. However, this sensor stays on for 5 seconds minimum after the person moves out range. I have tweaked the time delay ...
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0answers
33 views

AM2315 Sensor Reading Fails

I'm facing an issue in data reading for AM2315. Sometimes it fails reading the data, but when I'm unplugging the sensor and again inserting to the port, it starts working again. It continues for ...
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1answer
61 views

Splitting a 5V digital signal in two, for two different ICs

I have an application where a hall-effect switch's digital 5V signal needs to be read by two separate ICs, a motor driver and a microcontroller. Can I simply route the signal to both inputs, or do I ...
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1answer
45 views

Sensors - How to convert 4-20mA output to temperature and pressure values?

I'm dealing for the first time with two sensors, of pressure and temperature. Both have output of 4-20mA, then I'm using a 47 ohms 1% to convert to voltage. When flows 20mA, 20mA * 47 ohms = 940mV, ...
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1answer
29 views

BLDC Motors: Calculating the offset between rotor flux angle and rotary encoder Measurement

I am using an AS5147 Rotary Sensor to measure the position of a BLDC Motor. The motor is a 11 pole BLDC/PMSM. I have my own inverter circuit and right now doing a look up table based Space Vector PWM ...
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1answer
47 views

Recording USB digital output (24-bit A/D) [closed]

I have found a 2-channel, USB-powered, ICP® sensor signal conditioner with USB digital output (24-bit A/D). It is supposed to provide me with a digital output that I should be capable to read from my ...
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0answers
47 views

convert neagative out put signal of sensor to apply adc

I have a problem in convert out of RPM sensor that has -10v - +10v analog output signal. How can I convert the output signal to 0-5v by practical circuit to apply in ADC of micro?
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1answer
38 views

Is error due to sensor tolerance random or systematic? [closed]

Welcome all. It might sound like basic question however it is question worth asking.
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1answer
54 views

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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0answers
66 views

Assistance in finding proper sensor for short-range object detection task

We are working on a research project. We try to measure the distance from an object to some static line/pole. The area of interest is within a range of 1 to 5 meters, and the tracked object is a human....
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2answers
183 views

Problems getting correct readings from ACS71020

Me and my team are developing an LED light controller for street lighting applications. We are trying to measure current draw, voltage and power consumption using Allegro's ACS71020 but the readings ...
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1answer
72 views

How to code for measuring the blood glucose level using NEAR INFRA RED SENSOR [closed]

I want to know how to code NEAR INFRA RED SENSOR to measure the blood glucose level using Arduino or NodeMCU. I searched about this topic in the internet. I have only found lots of pdf with the ...
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0answers
33 views

Have I understood this solution to the sensor synchronization problem correctly?

I read a research paper which proposes an algorithm to synchronize sensors in a way that is independent of the sensors. Beginning with the simplified version which assumes no drift between the sensor <...
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0answers
38 views

What kind of temperature sensor to use?

I want to make a case for a FPGA eval board and wanted to monitor the temperature inside to start a fan if the temperature exceeds a certain value. What kind of sensor is best suited for this task in ...
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0answers
35 views

Control register of magnetometer in MPU-9250 reseting itself

I want to read magnetometer outputs from the MPU-9250 sensor (Datasheet, Register Map) but the CNTL1 Register (0x0A) of the magnetometer resets for certain values. I configured the sensor properly so ...
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0answers
36 views

Confirmation of connection between TSAL5300 IR sensor and BPW34 photodiode

I need to check whether my NIR LED sensor and BPW34 photodiode connection are correct or not. Does my IR sensor have to be infront of the photodiode? I am going to place my finger on the IR sensor to ...
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0answers
29 views

Weight Beacon Design

I need to develop for my business an weight emitter. Basically all I need is that a weight sensor that will continually emit weight from a connected bin, which will be captured by bluetooth from a ...
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1answer
28 views

Are hall effect sensors ratiometric?

I am working on the Arduino magnetic levitation project and it requires "ratiometric" hall effect sensors. On amazon and adafruit there are no hall effect sensors that are explicitly "...
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2answers
52 views

Confusion with IC sensor functionality

There are absolute and gauge pressure sensor types as follows: https://ie.rs-online.com/web/p/gauge-pressure-sensor-ics/8212393/ https://ie.rs-online.com/web/p/absolute-pressure-sensor-ics/7176527/ I ...
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1answer
22 views

Calibrate/adjust sensitivity of a 801S Vibration Sensor Module

I have some 801S Vibration Sensor Module I want to use for a project, but I need to make sure they have the same sensitivity. The sensor module has a potentiometer which makes it possible to adjust ...
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1answer
95 views

Is this a good circuit for detecting current path to ground?

I basically need to detect if the switch is closed (the application is a water level sensor where current flows to the grounded tank through the water). Is this a good design, or how can it be ...
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0answers
44 views

one-shot circuit with infrared sensor

If our hand is near the infrared sensor, it will remain in HIGH condition until we release the hand from the sensor. How can an additional circuit (without a microcontroller and without another ne555) ...

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