Questions tagged [sensor]
Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
2,422
questions
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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% ...
2
votes
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 ...
0
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0answers
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 ...
0
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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 ...
0
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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, ...
1
vote
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 ...
1
vote
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 ...
0
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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 ...
0
votes
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 ...
0
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2answers
46 views
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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 ...
0
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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)...
1
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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-...
0
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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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
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:
...
3
votes
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 ...
-4
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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 ...
-4
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
2
votes
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:
...
0
votes
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 ...
0
votes
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.
3
votes
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 ...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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, ...
0
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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 ...
-1
votes
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 ...
0
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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?
-1
votes
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.
1
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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....
1
vote
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....
3
votes
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 ...
-4
votes
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 ...
1
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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 <...
0
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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 ...
0
votes
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 ...
0
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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 ...
0
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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 ...
1
vote
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 "...
0
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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 ...
0
votes
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 ...
0
votes
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 ...
0
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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) ...
