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

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How can I change temperature range of TMP36 from (-40 °C - 125 °C) to (10 °C - 40 °C)

I am designing a temperature controller system using TMP36 as a sensor and Arduino UNO as a microcontroller. I am using 3.3V with AREF pin. I am working in the range of 10-40 °C. How can I change the ...
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0answers
23 views

Measuring vehicle's forward and lateral acceleration using a smartphone

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
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2answers
73 views

ADXL345 acceleration data readout looks strange - STM8

after finally finding out how to create a software SPI connection i now can successfully read the data from an ADXL345 acceleration sensor. But they look rather strange to me, this are some sample ...
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2answers
48 views

Distance to a moving object [on hold]

My son and I have an experiment we are trying to achieve-measurement to a moving object. The moving object will be a mouse, in a 1X1m area. On the mouse, we want to place some kind of sensor or ...
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1answer
15 views

circuit explanation for detecting different gases by mq2 with raspberry pi [on hold]

I am able to get the readings from mq2 sensor but don't know how to detect different gases by it. Can anyone help me in getting the circuit explanation of detecting different gases by using mq2 ...
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0answers
17 views

Capacitive touch sensir QT1011 wiring? [closed]

I want to read BPM from capacitive touch sensor, in the datasheet it is indicated that if we pull-up the output we obtain bpm signal, but if we want to read it on an microcontroller we must have 2 I/O ...
-3
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0answers
43 views

What sensor to use for detect what human in what room? [closed]

I want to know what employee presidents in what of my office rooms? in fact at first i should setup a sensor on every of rooms in my office and at the next, put a card or tag on every persons pocket ...
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1answer
36 views

Automatic LED lamp with sound sensor [on hold]

I have an auto light circuit with a sound sensor. The problem is when I try to simulate, this circuit does not work. Here is the circuit. I think the mistake is on the resistor is too large. then I ...
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1answer
42 views

GAS leakage circuit

i tried to simulate the circuit below with the Proteus 8 Professional , but i didn't find the SL100 transistor so i replaced it with BC547 , is it ok? and when i give the pin 4 high , the LED starts ...
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1answer
65 views

Reasons to use an analog temperature sensor instead of a digital one

I'm designing a microcontroller-based system that includes a thermostat. When choosing which temperature sensor to use, I noticed that analog ones have more or less the same power consumption, the ...
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1answer
66 views

Why we put 10Kohm resistor in parallel with 144Kohm that exist inside USB-6008? [closed]

By using LM35 Temperature sensor and USB-6008 a 10Kohm resistor is placed between GND and AI0 and connected to LM35 with a wire to GND and Vout respectively. By refer to Analog Input circuitry in ...
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1answer
21 views

SHT21P temperature and humidity measurements

I'm looking at Sensirion SHT21P humidity and temperature sensor and I noticed that humidty has 12bit resolution while temperature has 14bit resolution (the datasheet in PDF is here: Sensirion SHT21P ...
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1answer
33 views

Arduino HC SR04 distance sensor still works even if not connected to gnd

I'm fairly new to electronics & arduino. When experimenting with the arduino wemos & the distance sensor HC SR04 I noticed that connecting the GND isn't necessary. It looks like the gnd is ...
0
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0answers
65 views

Detect Static Human Beings [closed]

I'm currently working on a which detects stationary human presence during while sleeping. For this purpose I need a way to detect when the human being is sleeping on a bed or is stationary/static ...
0
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0answers
29 views

How to detect placement of the ring on the piller using force measurement [closed]

Hy all, Please suggest me what kind of sensor and electronics will be used to detect the placement of the ring on the peg. Ring is made of silicon with weight around 1-2 gram and peg is ABS plastic. ...
3
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3answers
84 views

How to efficiently power wireless sensor node from a 9V battery?

Context I have recently set out to add some wireless features to my entry-level smoke detector. Problem In order to achieve that, I will be adding a custom pcb embedding an ATmega328P and a ...
0
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2answers
23 views

Force sensor resistor design with linear changes [closed]

Is there any design yields the force sensor to get linear result from 1Kg-10Kg range of sensing? I've tried the voltage divider configuration and Wheatstone bridge but I still see the non-linear ...
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1answer
19 views

Sensor Performance Analysis

I've recently built a temperature sensor and have been testing it against a reference thermometer in several different scenarios/environments/temperature ranges. My question is, how do I analyse my ...
2
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2answers
64 views

Low power device in sealed unit — design help

Main question: can I build an arduino-based sensor that'll use such low power that something like inductive charging will suffice to power it? Details: I've got a "holding tank" on my boat ... a ...
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0answers
25 views

High-accuracy non-invasive current sensors for sub-metering [closed]

Let the smallest home-appliance for which we need to measure current be of 10W rating. For a 220V-240V supply, that current is just above 40mA. One of the main intentions here is to perform ...
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1answer
45 views

Monitoring of a System through an Arduino?

I am currently working on a project, where I will be doing the monitoring of a mechatronic system through the following measures : 6 x Motor temperature (Digital Signal) 6 x Motor Current (Analog ...
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6answers
1k views

Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...
1
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1answer
48 views

How to find a right sensor for co2 measurement [closed]

I would like to select a set of sensors which with combining them I can monitor the air quality in home. I considered 5 main factors: temperature, humidity, co2, Pm2.5 and probably voc. I found ...
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1answer
68 views

load cell continuously monitor load

I want use 50 kg of load cell of weighing machine to measure 30 kg of load for an one or two months,and load continuously decreases because of consumption on daily basis. my question is that the ...
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1answer
54 views

What's the most efficient way to detect a break in a circuit [closed]

I'm building a sensor that detects when a refridgerator door is left open. my goal is to use 2 contacts that close the circuit when the door is closed. So, when the door is opened, the contacts open ...
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1answer
45 views

Simulating a Constant Temperature Anemometer

I am trying to simulate the results I see when using a constant temperature anemometer circuit to sense air flow. An excellent discussion can be found: arduino thermal anemometer. Here is my ...
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0answers
47 views

Mega Interrupt doesn't work [migrated]

I am working on a protection circuit with 2 raindrop sensors which would be hooked onto the arduinos 2 interrupt pins and as soon as they detect water they shut some relays off, turn a red led on ...
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1answer
43 views

What is an ideal setup for detecting objects moving through an enclosed space? [duplicate]

I'm trying to create an ammo counter for an airsoft gun. I'm going to control it with an attiny series MCU and i want to detect the projectiles exiting the barrel using a light based sensor. Now ...
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3answers
78 views

How to use photoresistor for counting passing objects

Can photoresistor be used for counting passing objects?## Heading ## Hello i'm new to the electrical things I wanted to ask if i can use the photoresistor sensor for counting passing objects if ...
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2answers
50 views

What type of sensor (w/ bluetooth)? [closed]

I own a cafe very close to a university campus. As such I get lots of students coming in to buy drinks/food and study during the day. However, a lot of the time all of the available places will fill ...
0
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1answer
48 views

passive motion sensor

I would like to get a microcontroller out of sleep when the board starts moving (or vibrating). If possible it should just be a passive switch (I only need a positive edge from a battery to get the ...
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2answers
67 views

Using two pressure sensors with same address over I2C

I'm a novice programmer and I have recently purchased the SparkFun Pressure Sensor Breakout - MS5803-14BA and used it to take pressure readings quiet easily with the sample code provided and an ...
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0answers
32 views

qrd1113 vs qrd1114

Does anyone know the differences between qrd1113 and qrd1114? The datasheet doesn't include any information on the topic.
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1answer
46 views

How to dive into IoT world with just high-level programming experience [closed]

I came from a high-level programming world and recently got a bit bored. Now I want to dive into IoT subject and start a hardware side project. I was thinking if there is a Hello World IoT tutorial, ...
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0answers
36 views

Pulse sensor: Choosing the right resistor for the phototransistor

I want to use specifically the SFH 309 NPN phototransistor in order to create a pulse sensor that works as seen below: The IR diode emits IR light to the fingertip from the one side and on the ...
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0answers
31 views

What kind of sensor i should use to detect object that blocked the light?

i want to ask about the sensor i should use for this problem. My problem is i want to detect if there something blocked the light. Im also ignore light from environment, so consider there's no light ...
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1answer
37 views

Capacitor near analog line sensor

Is it necessary to place a capacitor near VCC even if there isn't one in the datasheet? The one I am talking about is QRE1113. ...
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2answers
62 views

Using a reflective sensor to detect green-

I need to build a circuit that detects whether a green object is in front of it. As I do not need to know which color is in front of the sensor, but only if there is a green object, I thought a ...
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2answers
80 views

Choosing resistance in series with a photoresistor for best light-measurement resolution

simulate this circuit – Schematic created using CircuitLab I have a photoresistor, R1, and as a voltage divider a fixed resistance, R2. There is a voltage of 5V over these two, and the ...
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0answers
18 views

220v flood sensor setup

I have a question that I think might be easy for someone with more electrical knowledge than me. What I am looking to do is have a simple water-sensor that either trips a breaker, or cuts off the ...
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1answer
72 views

3 Amps and 5 volts needed but don't know how to obtain

I am creating a circuit that detects ozone gas. The gas sensor requires a 5 volt supply and at least 3 amps. How do I get these amounts using batteries? I have researched how many amps different ...
0
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4answers
108 views

How to connect sensors to PCB in bulk?

While it is easy to bulk produce PCB's with sensors attached directly on the PCB how do you bulk produce PCB's that area attached with a length of wire (up to 1.5m) to sensors? One solution would be ...
3
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1answer
46 views

accuracy of magnetic field sensors in electrical vehicles

For coordinate system alignment purposes, as demonstrated in the figure, I want to use the smartphone's virtual orientation sensor. However, the virtual sensor is using a combination of acceleration, ...
-1
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1answer
130 views

How can I connect dozens of sensors of the same address to one i2c bus?

I want to connect dozens of i2c sensors of the same type to one arduino. Reprogramming the address is unfortunately not possible for all the sensors. I will illustrate what I mean with the following ...
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0answers
11 views

measuring the coherence between wearable sensors signals

I am trying to measure the coherence between two acceleration signals collected from two different wearable devices, smartphone and smartwatch, I am applying the Coherence (signal processing) and I ...
0
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2answers
62 views

What is the circuit for the Singing doll that start when touching hands

If you look at the Elsa singing doll toy, it trigger the music/singing when you touch both hands. Also, this toy can stay inactive for months on only 3 little battery I am assuming they are ...
0
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0answers
110 views

How to “transfer” a capacitive touch?

First post on here so forgive me if I've done something wrong. I'm designing a product with a control panel and I wanted to use a capacitive touch for selecting options with an ATMega chip (those ...
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2answers
40 views

Combination of acceleration signals

have xA, yA, and zA acceleration signals collected from a smartphone and I call it: set A and I also have xB, yB, and zB same acceleration signals from smartwatch: let's call this set B. I need to ...
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1answer
74 views

Heartrate measuring using capacitive touch sensor

I am new here, and I hope someone could help me. So I've read in the datasheet of the capacitive touch sensor ATMEL42QT1011 that we could use it as a heart rate sensor.But what I don't understand is ...
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1answer
30 views

What is a good wiring configuration to minimize noise on an analog DC signal? [closed]

I am measuring a photodiode with a high precision ADC, but they are currently 0.5-1m apart. The voltage will be constant. I would like to take the measurements as quick as possible so it would be good ...