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Questions tagged [sensor]

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

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1answer
47 views

How to connect a 2 pin photodiode?

Initially, I have used 3 pin photodiodes, where the anode is connected to the resistor and has a wire which goes to group and the other goes to an analogue input to read the voltage. The cathode is ...
2
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1answer
46 views

Linearizing a 0-10V non linear sensor

i'm using this sensor AIR FLOW METER, but i've seen on page 11 that the 0-10 V output it's not linear, how i can linearize that output?
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0answers
36 views

Microcontroller with GPS and temperature sensor [on hold]

I am looking for a microcontroller, that has GPS and also a temperature sensor. Or maybe just a mircocontroller with GPS that I can connect a temperature sensor to.
0
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1answer
32 views

Non-Corrosive Water Sensing

I have been told that passing DC current through two probes in water will lead to corrosion on the terminals. Apparently AC does not cause corrosion. Preventing corrosion is of high importance to me....
0
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1answer
39 views

Ultrasonic sensor? [on hold]

I am in search of an ultrasonic sensor that can measure through multiple objects. I am specifically looking at a sensor that can penetrate through metal and to the other side of it. I want to receive ...
0
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1answer
75 views

Amplifier with true ground output swing and A/D conversion

I want to amplify a 0-20mV signal from a sensor to 0-2.048V in order to feed it to an ADC (with a reference voltage of 2.048V). After I will input the digital signal to a microcontroller. I need to be ...
0
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1answer
29 views

Bluetooth Concurrent connection

I have multiple sensors that sends data via bluetooth to my laptop. At present, I can only connect one bluetooth sensor with the bluetooth of my laptop. It needs pairing, and then connects. So if I ...
1
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1answer
37 views

Compensate centrifugal force in accelerometer measurements

I'm working on a project that includes counting the revolutions of a cylinder connected to an engine. This engine runs at a minimum of 5 revolution per second and a maximum of 9 revolution per second. ...
1
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3answers
107 views

Do I need to filter before sending signal to an ADC?

I have an ADC that is capable of a 25kHz sample rate and I have a sensor whose bandwidth is 200kHz that I'd like to hook up to. This is a current sensor. Nyquist tells me that I need to limit the ...
1
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1answer
48 views

Ringing issue on I2C FM+ bus between MCU and few sensors - Power supply issue?

I'm experiencing some issues while probing a problematic I2C bus on the oscilloscope. We want to interface several TLV493D-A1B6, with a STM32L4 (we are working as well on STM32F4 and have the same ...
0
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1answer
103 views

How to measure the angle of a rope on a moving airplane?

I've got a simple rc plane which I want to fly on a tether. The tether is attached to the bottom of the plane like this: I now want to know what the orientation of the rope on the bottom of the plane ...
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0answers
35 views

Phototransistor Daisy Chain

I'm trying to find a solution to daisy chain together over 200 phototransistors for use with a moving concentrated light source. I need something with fast timing, so I wanted to go with a bunch of op-...
0
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3answers
101 views

Can a series resistor be used to limit the power consumption of a phototransistor?

I’m hoping to use several QRD1113 IR proximity sensors in a device, and they work well but have higher power consumption than I would like. I’ve tested many other ones, but I haven’t found another ...
3
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4answers
761 views

How to tell how sensitive a photodiode is?

I am looking to buy some new photodiodes for a project. Currently, I have been using expensive photodiodes with a picosecond level rise and fall time and a very small area to pick up light. The ...
2
votes
1answer
63 views

DHT22 bad readings on long rj45 cable

Duplicate of https://raspberrypi.stackexchange.com/questions/91781/dht22-bad-readings-on-long-cable, I figured there is chances people here have a solution for me. Hi, I'm preparing a setup with a ...
0
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1answer
48 views

power consumption of sensors

How to measure the power consumed by a temperature sensor theoretically? The datasheets mention the supply voltage range and output current. So, to calculate the power supply current will be used in ...
2
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1answer
48 views

Are magnetic sensors able to pick up the electromagnetic field inside toroids?

From my understanding, correct me if I'm wrong, the electromagnetic field outside a toroid is 0, but it has a EM field within the shell itself. So my question is can a magnetic sensor pick up on this ...
3
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2answers
176 views

How to understand an ultrasonic sensor datasheet?

I'm trying to model the ultrasonic sensor for a simulation and I need to somehow express in what angles and distances the object will be detected by the sensor. What does sensitivity mean? It is set ...
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2answers
78 views

Microcontroller external interrupts

i am working on project in PIC18F452 and i have some difficulties that how to connect 8 sensors to external interrupts INT0 INT1 INT2. Any suggestion
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1answer
66 views

How can I make a circuit that amplifies and mixes, at different ratios, the sound signals coming out of two different instruments

Do I need to use 2 sound sensors to detect the sound signals? If yes, can the sensors be connected directly in the circuit? or do I need to use an Arduino card and program it? Instead of the the ...
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1answer
32 views

why gyroscope sample rate can be changed by frequency, while accelerometer sample rate cannot?

This is from the mpu6050 datasheet. In the datasheet, gyroscope sample rate can be changed by frequency, but accelerometer cannot. Why this happens?
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1answer
37 views

Stable 200uA Current source by cascading REF200's Current source and Current mirror

I am trying to work on above circuit. A common operating point of ISFET pH sensor is a drain-source current of 100 uA and a drain-source voltage of 500 mV. I am using REF200 current source to feed ...
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1answer
30 views

Sensors for PIC microcontrollers [closed]

I recently started working with PIC Micro-controllers and I am thinking of working on a project to get a hands-on experience. I am looking to interface a few sensors with the PIC via the EUSART and ...
0
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1answer
48 views

Measuring direction of current to determine moisture is present

I am building a moisture sensor with an AC current to prevent electrolysis. The AC will be generated with a simple schmitt trigger oscillator with the midpoint reference set at 2.5V. Water would ...
0
votes
1answer
39 views

What is the receiver component in Snap Circuits part U24 (Infrared Receiver)?

I'm trying to find a datasheet for the receiver component in Snap Circuits part U24, which is an infrared light detector/receiver. It looks exactly like a TSOP382 sensor (picture below) but doesn't ...
4
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3answers
679 views

Building circuit to amplify small sensor signals using an Instrumentation Amplifier and 24-Bit ADC

I'm a beginner when it comes to circuit design and I have spent the last few weeks doing research on this topic. I have now chosen some ICs (Instrumentation Amplifier and ADC) and would like to build ...
1
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0answers
23 views

Sampling DC and AC components of capacitive sensor

I'm using a MEMS capacitive pressure sensor SCB10H. As I understand it, I can wire it up in one of two ways. Either I can measure the absolute capacitance using a chip like the TI FDC1004. In this ...
3
votes
1answer
72 views

Unusual Rotary Encoder Output

I'm trying to replace a rotary encoder with push switch from a Boss SE70 effects unit as the switch is broken; the same encoder is apparently used in a number of Roland products such as the JD-990, JV-...
0
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4answers
61 views

Acceleration in the Z direction in Earth frame regardless of orientation

I have acceleration readings on 3 axes from an accelerometer, I'm trying to find a way to get the acceleration in the vertical direction independent of the current orientation of the sensor. I have ...
6
votes
2answers
120 views

LED as light sensor not properly working in circuit

I read some articles about using an LED as a light sensor. I chose an IR LED and checked the voltage levels produced in different light situations resulting in about 200-300mV in full artificial light ...
0
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0answers
28 views

Using Channel A complement and B complement on rotary encoder when regular channels are broken

I am trying to use a rotary encoder (ENC EASY 16 https://www.maxonmotor.com/medias/sys_master/root/8831292899358/2018EN-409-410.pdf), and measurements from an oscilloscope show that channel A is ...
0
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2answers
38 views

TA12-100 Current Sensor (increase range)

I have a TA12-100 current sensor. The circuit have a 200ohm resistor as shown below. At 5A the analog signal hits the roof (1023). My question is - can I increase the resistor to be able to get ...
2
votes
2answers
414 views

How to read data from this sensor?

I am using the MLX90393 Magnetometer IC from Melexis. More specifically, I am using the breakout board by Sparkfun. I am still a beginner when it comes to programming, and this is my first time trying ...
0
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1answer
37 views

What are the optimal methods for controlling specific header pins via Micro-USB?

Besides buying a Raspberry Pi with GPIO, what is involved in creating a circuit board that can send data to specific pins through a micro-USB cable, as well as read from data from sensors? I am open ...
1
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2answers
36 views

Read temperature sensor from microcontroller to Android application (via microUSB)

I'm working on a concept for a project, and I'm having difficulty determining whether this application is possible. I will have some misc. microcontroller with an attached temperature sensor, and ...
0
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0answers
13 views

sht sensor overexposure to high air humidity

has anyone encountered SHT Sensors returning higher humidity readings after certain periods of overexposure to high air humidity? I'm using weatherproof sht10 sensor bought from aliexpress, running ...
0
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3answers
92 views

How to switch PIR sensor on/off based on photocell result

I've built the following circuit based on an ATtiny85 for a night lamp. The circuit is powered by a 3.7v LiPo battery. I'd like to turn off the PIR sensors when the photocell detects light in order to ...
0
votes
1answer
82 views

Doubts in providing power to an LED

I am making a project on water level indicator. I've completed the circuit like this: The circuit is closed through the water. The problem is even before switching on the circuit, and with terminals ...
0
votes
3answers
75 views

Interrupt debouncer for switch sensor

I want to read the state of a switch sensor (magnetic contact). I'm thinking to connect the switch between an interrupt pin of my micro and ground, listening for CHANGE status. In this way I have ...
0
votes
1answer
73 views

Ultrasonic Sensor Serial Output Grounding Issue

I have a small circuit which uses a Maxbotix Ultrasonic sensor (Datasheet: https://www.maxbotix.com/documents/HRLV-MaxSonar-EZ_Datasheet.pdf) to take distance measurements and then transmit them over ...
1
vote
0answers
118 views

Honeywell I2C RH Sensor SDA line experiencing fluctuation between Vdd and Vdd/2

I had a problem when implementing I2C communication between NXP Kinetis K50 micro-controller and Honeywell Humidlcon I2C RH sensor. The RH sensor doesn't acknowledge when receiving the default address ...
2
votes
2answers
54 views

Will this SOI circuit be grounded?

Upfront, I apologize if this may be a terribly obvious question. I don't have all of the background to understand it confidently. I'm trying to apply a voltage for an electrophoresis experiment ...
1
vote
2answers
48 views

PIR sensor (HC-SR501) with n-Mosfet transistor not switching off

I have none to less electronics background, with limited knowledge whatsoever. I've used some schematics from the internet https://www.youtube.com/watch?v=ugDPdgGekNo to put in place the below setup : ...
0
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0answers
46 views

BME280 and MPU9250 not working together

I'm doing a hobby project with two sensors: popular weather sensor BME280 and 10DoF sensor MPU9250. My board of choice is Teensy 3.6. Links to both sensors (Polish shop): https://nettigo.pl/products/...
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1answer
52 views

Which microcontroller is best for low power energy harvesting application s? [closed]

I am going to use a mini wind turbine driven by train induced wind that will generate power. Now I have to store this energy in rechargable batteries with the help of boosters and buck converters. ...
0
votes
1answer
35 views

Hall sensor for slowly varying magnetic fields

I am trying to measure the change in the field of a permanent magnet (at about 50 mT) due to temperature fluctuations at room temperature (timescale ~ mins to hours). The sensor I am currently using ...
0
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1answer
35 views

How does capacitive sensing relate to the resistance of the object entering the magnetic field? [closed]

Example: Setting up a capacitive area and dropping resistors of different sizes into the field, how do they affect the field differently? Are several resistors accumulative? Would i be able to tell ...
1
vote
1answer
54 views

Electrical Impedance Tomography (EIT)

I am trying to replicate the circuit in this paper: http://chrisharrison.net/projects/electrick/electrick.pdf I have followed the schematic in Figure 7 and utilized Howland current source as ...
1
vote
2answers
85 views

Grounding a Laptop

I have the following problem: I am currently debugging an electronic sensor board which is connected to the USB port of a laptop. The USB port is used both for communication via UART and to supply ...
0
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1answer
33 views

SSC TLE5012B read out

I have some trouble with understanding the following IC and its SSC interface: https://www.infineon.com/dgdl/Infineon-TLE5012B_Exxxx-DS-v02_01-EN.pdf?fileId=db3a304334fac4c601350f31c43c433f It is ...