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Questions tagged [sensor]

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

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17 views

Detect signal from different sensor via radio, and communicate between raspberry and Adafruit Trinket Mini - 5 V via radio

I'm developing a system, with a central system where there a lot of sensor directly connected with Raspberry. I need to receive a radio signal from an external sensor, what radio module can I use? I ...
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3answers
93 views

Microcontroller overheating when sensor is plugged in

I am building a board based around an STM32L051C6 microcontroller, which will measure a hall effect sensor (AH3362Q) and count the time in between the edges the sensor sees. The sensor is powered from ...
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1answer
65 views

Detect if an electromagnet it touching metal (without a switch)

I have a simple 12V DC holding electromagnet connected to a microcontroller using a MOSFET - the once you buy on aliexpress or eBay for cheap [1]. How can I detect if the magnet is in full contact ...
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1answer
49 views

Reliable sensing method for device inside a parcel to detect when/if the parcel is opened?

I'm wracking my brain for reliable ways for an electronic device to detect when/if the parcel it is sealed inside is opened. The device will be sealed inside the package and activated via Bluetooth ...
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14 views

SimpleDHT: what does error code 4112 mean? (not in source code on GitHub)

I am using the SimpleDHT library, running on a ESP8266. Occasionally I get error code 4112 on serial output. The variable that holds this error code is declared as an int. However, the source code ...
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1answer
21 views

Trigger motor through Raspberry Pi if it's plugged in, otherwise through touch sensor

I'm trying to design a custom PCB that is powered through USB (5V DC), has a touch sensor, powers a DC motor and can optionally have a Raspberry Pi Zero plugged into it through a GPIO header. If the ...
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0answers
50 views

How to check if a sensor is burned? [closed]

I tried to do something with arduino and I think that maybe I burned a chip, and I wondered how can I check if it's really burned or not ? It is nrf24l01 like this one I think tbat it's burned ...
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50 views

Simplest/cheapest way to measure furnace gas usage?

I want to use an Arduino to datalog the gas usage of my furnace. This isn't really an arduino question though, its more related to finding the best sensor/electronics to interface with the furnace. I ...
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1answer
21 views

Analog Sensor output signal accuracy and sensitivity

I have to decide between 2 load cell models. the only difference between the two is that the output on one is 2mV/V and the other is 3mV/V. Both are rated at 2.5klbs. Which one of them would be more ...
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1answer
33 views

Siemens Part Number(s)

Hy guys, anyone with an information based on Part number(s) for SIEMENS QRB1 Photo Resistive Flame Detectors? I have also attached the image of the detector I am referring to.
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1answer
25 views

ultrasonic-sensor to Logic Level Converter to raspberry pi

Trying to connect Ultrasonic sensor to my raspberry Pi. Im aware of two methods: connect the trig to a 1k resister before connecting to raspberry pi Use a 8-Channel Logic level converter I trying ...
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1answer
59 views

Why does making this change to my DHT11 code cause it not to work?

Note: This might not be a programming question. If it turns out that it is, I will close it. I am using an ESP8266 to build some air quality web servers. One of the sensors I am using is the DHT11 (...
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3answers
60 views

digital current monitor/sensor for monitoring ~0.1 uA to mA current from a MCU and sensor [closed]

Hello I am in need of a current monitor/sensor like INA219 for monitoring current in the range of 0.1 uA to ~ mA. Kindly suggest a way to monitor current in such lower range. I have a microcontroller ...
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0answers
29 views

Interface with wired alarm using Arduino or similar

My house is equipped with a wired alarm system that's missing the hardware controller board. Whats left is a number of sensors (NC) and the wiring to a central location. Cable lengths are anywhere ...
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2answers
48 views

How to reduce measuring angle of JSN SR04T?

I wanted an waterproof ultrasonic sensor. So I used JSN-SR04T. But the problem is it has huge measuring angle(75%) which results in measuring obstacles which are not required. How can I reduce the ...
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2answers
59 views

Hall effect sensor as 2 wires switch

I need to find a way to make an on/off proximity detector triggered by a magnetic field, fitting in a small space of about 5mm ^ 3, and connected to the board by only 2 wires. I know a could use a ...
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1answer
36 views

Understanding the MPX2053 Pressure sensor

So I am a bit confused as to how I would operate a pressure sensor whose pressure range is between 0-50 kPa because the moment I remove it from the packaging and expose it to the environment, it will ...
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2answers
241 views

Why does tracking different plant states result in totally different observer estimates?

I am trying to design a Luenberger observer (or a full state feedback observer) such that with one sensor available I can estimate all the states. A good tutorial is shown here. My system is 4th ...
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1answer
62 views

Point Water Level sensor

The company I work for uses conductive point-level water sensors to determine water level in a small tank. The manufacturer of these sensors has proven to have very unreliable quality control and ~30% ...
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0answers
79 views

Why my computer mouse reacts to tube light? [migrated]

I was working on my computer and I lifted my mouse and rotated it. Light from the tube light which was 2-3 meters away from my mouse fell on the mouse sensor, the cursor started moving as if I shook ...
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1answer
34 views

Light Barrier Sensor - clocked or non-clocked light?

I was looking for a sensor, then I caught this: https://www.di-soric.com/pt/OGU-031-P3K-TSSL-44413.html In the specs - emitted light section, it says the emitted light is "Red, Clocked", with a ...
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1answer
56 views

Need a sensor for detecting the presence of someone like a door sensor we have in lifts/elevators

Door sensors used in elevators/lifts are very expensive and my budget is not that much. But I need a similar mechanism or solution to detect the presence of someone if he/she is standing in the given ...
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1answer
51 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
75 views

Linearizing a 0-10V non linear sensor

I'm using this sensor AIR FLOW METER, but I see on page 11 that the 0-10 V output is not linear, how can I linearize that output?
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1answer
34 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....
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1answer
102 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 ...
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1answer
39 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 ...
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1answer
42 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. ...
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3answers
113 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 ...
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1answer
51 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 ...
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1answer
107 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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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 ...
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4answers
767 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 ...
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1answer
96 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 ...
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1answer
52 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 ...
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1answer
50 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 ...
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2answers
178 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
79 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
69 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
35 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
51 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 ...
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1answer
49 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 ...
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1answer
41 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
692 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 ...
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0answers
26 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 ...
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1answer
79 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-...
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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 ...
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2answers
145 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 ...
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2answers
62 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 ...