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

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2answers
84 views

Should I always put a low-pass filter on an ADC input?

I'm a recent hobbyist EE and new to micro controllers. I've built a test circuit to make measurements with a type K thermocouple, a PT1000 as well as an oxygen sensor. The weak signals go through a ...
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1answer
45 views

Gas sensors for multiple gases

I have some questions about gas sensors: If I want to detect several gases at once, do I just need one sensor or will I need one sensor for each gas? How will I know which gas I am measuring? ...
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0answers
34 views

If a sensor has both voltage and current outputs, how to calculate Vgs of the E-MOSFET?

If a sensor has both voltage and current outputs and connected as the Vin at the gate of a EMOSFET, how do I calculate the Vgs of the E-MOSFET? The Vout goes as the input for a microcontroller, where ...
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0answers
45 views

How to design circuit for robot motor

How to design a circuit which fulfill the requirement below. I am a chemical engineering student which do no have any electrical knowledge but still need to design a circuit for my project. Motor ...
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0answers
45 views

Tennis court lines, which sensor do I use to detect a ball?

I would like to make tennis court lines with a pressure/force sensor underneath them to detect when a ball is landing on them. On the internet I could only find very short pressure sensor that where ...
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3answers
87 views

Sending data from 4 transmitters to 1 receiver without a microcontroller

I am working on a project to wirelessly check whether any of four switches are pressed and I don't want to use a microcontroller on the transmitter side. I have worked with the cheap 434MHz HT12E/D ...
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1answer
53 views

Is there a thermal sensor technology that can measure an object heat at a distance of 10 meters for Arduino or atmega micro [on hold]

I am looking for a thermal sensor with a distance of 10 meters . In my plan , I would like to recognize objects based on the heat. for example car.
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2answers
66 views

Temperature measurement into USB [on hold]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
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1answer
23 views

What is the difference between OPB606 and TCRT5000?

I had to make a path following bot. I needed an OPB606 sensor for that, however I couldn't manage. Instead I used TCRT5000, but the bot is not working. Is there a similarity between these two sensors? ...
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0answers
47 views

Upper values of analog reading of sensor is cut off

We are using a dual element Motion sensor for our project. Here is the link of sensor we are using. Dual element Motion Sensor You can find the datasheet in the same link. This is our circuit ...
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1answer
18 views

Error in Magnetometer Readings

I have a magnetometer which I am using for orientation purposes. What i would like to know is how to calculate the total error when finding the magnitude of the magnetic field vector. So I know each ...
0
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1answer
89 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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0answers
34 views

Read bipolar torque sensor with Arduino

I have connected a bipolar torque sensor to an Arduino and I can without problems read the data when turning the sensor clockwise. The problem is, when I want to measure in the other direction nothing ...
2
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2answers
59 views

LVDT that is not an LVDT

I have been given a specification for an LVDT transducer where I was expecting a clear Va, Vb relationship. The Va and Vb are however described as having a phase and an non-linear relationship (i.e. ...
1
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1answer
36 views

What type of electrical sensing element is used in Water Quality Monitoring Meters?

What type of electrical sensing element is used in Water Quality Monitoring meters such as those pictured below? I might not be using the correct search terms. Some of these meters monitor Total ...
0
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1answer
29 views

Dual-axis Inclinometer

Im working on a project where im designing a device that can be worn on the arm (using the elbow as the fixed angle). Once the device measures 45 degrees I want to program it to vibrate. My question ...
0
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1answer
62 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
3
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2answers
246 views

Using Arduino Mega With lots of strain gauges

I was looking for a strain gauge shield for an Arduino Mega. I found this link which I found really useful: http://www.osengr.org/Projects/Load-Cell-Shield/Load-Cell-Shield.html At the bottom of the ...
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0answers
36 views

YHDC current sensor generats inaccurate values after hours , arduino

I am using YHDC SCT013 current sensor with arduino for monitoring the current profile of washing machines and using adafruit datalogging shield for the SD card and for the Real Time Clock. The ...
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2answers
45 views

Whcih type of load sensor should i use to calculate weight placed in a shopping cart

I wish to calculate the load inside a shopping cart and i am confused on which type of load cell/sensor should i use. Assuming weight from (0-50 kg). This sensor is to be interfaced with Arduino.
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1answer
70 views

How far can I wire a Sensor or an electrical component that it would work?

I had this doubt in my mind. I wanted to know the range till which a sensor could be attached so that it works. Suppose I have a setup, in which my main circuit is in a room and I have a PIR sensor or ...
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1answer
51 views

Pressure Sensor Calibration

Here's the situation: I need to verify the pressure sensor accuracy of a control board. I have a software to verify the pressure and I am using Ethernet Communication to communicate between my control ...
2
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1answer
92 views

An “operation” game sensor where the stylus is NOT attached to the power source

Edit: The person operating the catheter will be wearing latex gloves. The only human tissue the catheter would touch would be that of the patient. Also, to clear up some confusion about what exactly ...
0
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0answers
42 views

Combine LED with accelerometer in small size for violin bow frog

The question was extended from the post: Violin bow position tracking with SMD LEDs and photoresistors. It is easier to understand the problem and the purpose here with the link, but I will elaborate ...
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0answers
62 views

Faster PIR Sensor speeds?

I am trying to use an array of sensors to trigger a series of stepper motors based on peoples' presence within different areas of a hallway. It is for an interactive kinetic art piece at an elementary ...
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10answers
2k views

Do accelerometers know when they are moving straight up or straight down?

I need a sensor that I can only place on top of an object, to count the number of times the object moves up and down. Would placing an accelerometer on top of the object accomplish this or can it ...
0
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2answers
105 views

STM32F103RB ADC (pics included) strange values for temperature sensor (LM35)

I've connected one battery/2 batteries (GND and A0) and the measuremet displayed on the com26 port is ok. I've connected the LM35 (The LM35 has 1 celsius degree for 10mV measured value) on the VCC and ...
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3answers
50 views

Contact temperature sensor

I need a contact temperature sensor to get the temperature of a container. Anything like LM35 which I found from google search gives me ambient temperatures. Can anyone suggest an easy to use contact ...
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1answer
42 views

Temperature sensor slope explanation

I am looking at an accelerometer(data sheet is BMA280 ) which has capabilities of measuring temperature from -40 to 85 degrees celsius. It also specifies a Temperature Sensor Slope of 0.5K/LSB, where ...
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2answers
45 views

Expected percentage of collisions for uni-directional wireless transmissions

I am developing battery-powered sensors to measure different parameters inside my house. The measurements are taken by simple AVR controllers (no Arduino) at more or less regular intervals and will ...
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1answer
51 views

himidity sensor with more probes

Could you advice how to amend such schema in order to measure humidity on more probes? http://emesystems.com/images/smx/SMX555sc.gif The 555 is functioning as a resistance-to-frequency converter. A ...
2
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2answers
50 views

Electronic sensor for monitoring photosynthesis

I have to develop a sensor that can detect photosynthesis. So when the plants are exposed to sun I should get an indication that photosynthesis is happening inside the leaves. I found many products ...
6
votes
4answers
222 views

Is there a sensor that is equivalent to a dry toothpick?

For the non-cooks in the audience the dry toothpick test is used in baking (cakes, banana bread, etc.) to determine when the item is done baking. The procedure is to stick a toothpick into the food, ...
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1answer
68 views

1-wire humidity sensor with ID

I've created a temperature monitoring system using multiple DS18B20 temperature sensors and now I want to add some humidity sensors to it. The problem is that I cant find any 1-wire humidity or ...
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0answers
67 views

How do Dualshock 4 pressure sensitive buttons work?

I'm doing a reverse engineering research about the PlayStation 4 controller. I want to know how do the analog buttons work (the triggers in the bottom, not the analog sticks). I've found a nice ...
0
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1answer
84 views

Anyone may suggest a temperature sensor technology that will work to a max of 200ºC?

Cheapest sensor technology as possible, up to +- 5ºC or 5% of accuracy. Better if it doesn't need complex (and costly) additional circuits.
0
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2answers
58 views

How to determine minimal detectable acceleration on accelerometer?

How can it be determined the minimal detectable acceleration on analog and digital accelerometers? In datasheets I found only specification like sensitivity, noise etc. And how the minimal time for ...
0
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1answer
38 views

Salvaging TMP36 [closed]

Looking to scavenge a tmp36 off of some fried electronics, would anybody have any leads on where to look for this type of sensor. I normally wouldn't mind to buy one, but I live in a pretty remote ...
0
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1answer
37 views

Precise Tracking of Coordinates across small 2d plane Wirelessly [duplicate]

First off, I'd like to say my background is definitely more in the realm of software than hardware so I might be a bit of a beginner about certain things.. That being said, I have this idea that ...
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3answers
77 views

Best way to read 18kHz PWM signal with wide V_pk-pk (5.5-18V)

I am trying to design a circuit for level-shifting a PWM signal coming from a sensor and reading it with a 5V micro controller in an automotive environment. I will run my design by an EE at the end ...
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5answers
75 views

Microcontroller vs a sensor [closed]

Im trying to build a device that vibrates when the object reaches a 90 degree angle. I know I need a vibrator motor and a coin cell battery, but I don't know if I should use a microcontroller or a ...
0
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0answers
51 views

MHz EF-probe/sensor design

So I have a coil (sender) with a signal of the following approx specifications, for which I want to build an electric field sensor (receiver coil/probe), or alternatively an EMF-probe, if ...
1
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0answers
68 views

Ideas for triangulation of a small object within 6 feet

I'm looking to build a system that can detect the location of a tag within a 6 foot range to an accuracy of one or two inches. I have briefly looked into RFID sensors but I haven't found any that ...
0
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1answer
59 views

How can I find or build a passive RFID tag with a range of 6ft, as well as an associated reader?

I am looking to implement a RFID system that uses trilateration to localize a RFID tag. I have no experience with RFID, and although I have done some basic research, I have no idea where to begin. ...
0
votes
1answer
58 views

How does a microwave oven-leakage detector work?

What type of sensor or circuitry is inside one of these devices that allows measurement of microwave radiation strength? I've never opened one but I'm assuming it's similar to measuring RSSI on a ...
0
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1answer
187 views

Fast Sensor Object Counting With Arduino

I need to count objects from 5-10 mm with using 2 sensors at arduino mega board. I have used photoelectric sensor but it's really very slow. I have to use delay(1000) commands after count an object ...
0
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0answers
41 views

Track a ball on the field of play in real-time

Is there a way to track the 3D location of a ball (roughly 8cm in diameter) on the field of play (roughly 100m x 100m) in real-time? The ball will be moving at top velocities of around 20m/s. I'm ...
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0answers
30 views

DHT11 remote sensing — which resistor?

According to the DHT11 data sheet here: http://www.micropik.com/PDF/dht11.pdf, on wire runs longer than 20m, one should use a 'different' pull-up resistor from Data to VCC. What should the value be, ...
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1answer
43 views

Reflectance Sensor Input Issue

I have a Teensy 3.1 and I am wanting to receive data from a reflectance sensor, specifically this one from pololu: https://www.pololu.com/product/2459 ! This is the circuit of the reflectance sensor ...
2
votes
4answers
86 views

How can I sense if a cane is being held upright or fallen down?

I am trying to make a little wireless-connected gizmo to attach to my grandfather's walking cane. The idea is that when it senses the cane has fallen down, it would alert/call one of us so that we can ...