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

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1answer
18 views

How can a non-linear temperature resistance characteristics be a problem in sensors

When thinking about signal conversion in temperature sensors how could the non-linear temperature-resistance characteristics be a problem ?
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30 views

Measure the number of elements in a box by weight

Well , it might be strange or basic, but is there a way to measure number of elements- such as coins, small balls, inside a box, when the weight per element is known, and the box shape is also known . ...
0
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2answers
35 views

Help building acceleration detection device/circuit for my bike

I want to build a device using an accelerometer. Press a button after a bike ride and have a light turn on if during the journey I managed to attain a certain acceleration. Thinking of using some ...
0
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0answers
35 views

Controlling electric power steering using an Arduino to emulate torque sensor

I am trying to control an electric power steering rack with an Arduino. To do this I need to "trick" the EPS module that there is torque being applied when there really isn't. On the rack there are ...
0
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2answers
80 views

How PN junction diode is used as temperature sensor [on hold]

I know the operation of PN junction diode. But I wonder how they use it as a temperature sensor.
0
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1answer
46 views

Making a magnetic levitation system with arduino

I am planning on making a magnetic levitation system with an arduino that checks the value of a hall's effect sensor twice per second (but I have tried even 1000 times a second though) and turns the ...
0
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0answers
16 views

How to reduce settling time of a signal conditioning circuit for a PIR sensor

I have designed the circuit below to turn on an LED when movement is detected by a PIR sensor. Sometime when movement stops being detected the LED goes off quickly (within 0.5 seconds) and sometimes ...
0
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2answers
34 views

How to use Lightsensor relay with 3v output

I want to find solution for one small circuit with Light sensor. I need one small light sensor to drive 3v output. The power of all the circuit must be 5v and when the light sensor is off (no ...
-2
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0answers
24 views

connecting an alarm system to a wifi unit that can transmit the alarms to a smart phone [closed]

I would like to be able to connect an alarm system that monitors 29 devices located on a barge being towed without anyone on board to some sort of a wifi unit that can communicate those alarms to an ...
0
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2answers
39 views

Low voltage drop transistor for Arduino

I am using a MQ135 gas sensor in my project. It takes a max of 200ma and I have connected the Arduino to a battery so I can disable it when needed to save battery. I am using a transistor for that but ...
2
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2answers
139 views

A motion sensor that can be covered?

We are seeking after a motion sensor, probably PIR , that can be covered with regular plastic or ABS ( that means you will have a regular product enclosure where the sensor is inside it ) . I could ...
5
votes
2answers
499 views

5 year run time on small battery

I am working on a project that checks a sensor every 12 hours and reports the status via cellular modem to our server .. Power consumption is less than 1mA during sleep mode and spikes to 900mA ...
2
votes
5answers
138 views

What is the fastest temperature sensor?

I'm making a Sous Vide using Arduino with a DS18B20 temperature sensor. My problem is that the DS18B20 reacts too slowly to temperature changes. For example, if you take it from ice water (1°C) to ...
4
votes
3answers
392 views

Searching for the right temperature sensor with 0.001 [closed]

Is it possible for me to build a temperature sensor with 1mK accuracy? First I think I need to find the right temperature sensor. My problem right now is I can't find a temperature sensor with that ...
1
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1answer
68 views

Why am I seeing drift when using Madgwick algorithm to correct for orientation with 9 DOF IMU?

I am trying to correctly track orientation of a sensor with accelerometer, gyroscope, and magnometer, using the open source Madgwick algorithm. The algorithm returns quaternions which represent the ...
2
votes
1answer
58 views

OPT3001 conversion formula / equation?

I am struggling to find a real conversion formula for converting the RAW value into result that makes sense. I am using an OPT3001 sensor from TI and ATTiny25 as MUC. I have found one example online, ...
2
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2answers
70 views

Tomato Seed Warmer

I wonder if there is a very simple way to control one or two light bulbs in a box that are providing heat for my Tomato seed Propagator sitting on top ... i.e. I need the heat underneath...It would be ...
0
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1answer
42 views

TMP04 Temperature Sensor with Arduino Not going HIGH

I have a TMP04 temperature sensor (3 pin package). It outputs a square wave at approximately 35Hz and the duty cycle can be converted into a temperature reading (see datasheet). It has an operating ...
0
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2answers
62 views

What is the difference between Hall Effect and Magnetoresistance?

I was learning about sensors. I was confused about the Hall Sensors and Magnetoresistive Sensors. They both seem to be same.
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0answers
12 views

Datasheet MICS2614 - calculate sensor resistance R100ppb

The Datasheet of MICS2614 gas sensor shows the sensor resistance Rs/R100ppb over the O3 concentration in a graph. But as far as I can tell R100ppb is nowhere defined. The datasheet only shows R0 ...
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3answers
74 views

Understanding Source Code of I2C communication

So in my University studies we recieved few source code samples that are working with a OPT3001 Light Sensor. Our studies do not focus on engineering tasks in general, but this is a lecture that ...
0
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1answer
73 views

What are the Analog to TTL serial ICs called?

I have a sensor that measures an analog value and i want a ICs to convert it to TTL serial , because i want to send it afterwards via a bluetooth IC that takes TTL serial as input. I already have a ...
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1answer
45 views

5 mA DC Isolated Current Sensor

We are trying to measure the presence of ~ 0-5 mA of DC current in an isolated manner (no shunt resistors). Are there any commercially available solutions?
2
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3answers
59 views

How to measure output of the ultrasonic transducer?

I have found a test circuit for the ultrasonic transducer. How do I measure the output distance sensed by the ultrasonic transducer using my Arduino Uno R3? Please help. I have attached the test ...
1
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1answer
56 views

capacitive sensor and wire length

I'm a newbie and I've been playing with the awesome Adafruit CAP1188 capacitive touch gizmo. As long as I keep the length of the wires from the CAP1188 to my copper sticky pads to a couple of feet, ...
0
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2answers
56 views

How do you measure soil moisture using a capacitive sensor?

There are a number of capacitive moisture sensor designs on the internet, which use the insulated copper pads on a PCB.For example: ...
1
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3answers
59 views

In-house person identification system

For my smart home, I am trying to develop a system that allows me to identify which person is located in which room. I am a software engineer but I don't really have experience with hardware ...
1
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1answer
60 views

looking for a sensor that activates when hit by a certain note [duplicate]

The reason may seem a bit silly, but anyway: I am trying to turn a violin steampunk. I have never done this before and I'm not the best at engineering, so could someone help? The circuitry doesn't ...
0
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0answers
32 views

Detector/Marker technology Advice for ACCURATE Close Range, Stationary Spatial Measurement

My education was in biomedical engineering, so i don't have electrical engineering experience to know which type of marker/detector technology to consider. Advice/direction is appreciated. I'm ...
0
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1answer
37 views

Capacitive sensing between two copper plates

Is it possible to detect touch event and its position coordinates between two copper plates spaced apart by approximately 6-7 centimeters? The space between plates have to be transparent.
-1
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1answer
67 views

°F to °C circuit [closed]

HI there I need some help ASAP, need to create a circuit using a LM34 sensor, but I need to get a V=100 mV/°C output, an the LM34 works with °F. so far I have no Idea how to do it, so any help is well ...
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0answers
46 views

How to convert accelerometer values into fixed reference frame using quaternions?

My aim is to map raw accelerometer, gyroscope, and magnometer data into a "world view" or external reference frame. For example, in my test experiment I move the sensor board vertically up and down ...
1
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3answers
43 views

MQ-135 Gas Sensor Interface

I want to interface MQ-135 air quality gas sensor. Sensor have 5V output interface. However my mcu work at 3.3V. I can basically put a voltage divider. But sensor itself is a voltage divider with a ...
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1answer
202 views

Programmatically turn on PIR device with Arduino

I have a D203S PIR sensor operated device. I want to simulate motion detection with my Arduino and then let the device operate as normal. I have seen that shorting the PIR sensor for a couple of ...
5
votes
3answers
707 views

Why/when would you use a light to frequency converter?

I have looked at the TSL235 light to frequency converter and for measuring ambient light it seems expensive (~$1.50). What application would you have for using a light to frequency converter vs a ...
0
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0answers
16 views

atmega32 piezo detect knock

I am trying to hookup a piezo sensor to an atmega32 and detect a knock. From the following website I took the example for the connection: https://www.arduino.cc/en/tutorial/knock Except I am not ...
1
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1answer
59 views

Detecting fast laser pulses

I'm building a laser target with photoresistors and a 90FPS camera (which will probably become CPU bottle-necked) and when yesterday I went to shopping I just saw a barcode scanner and begun thinking: ...
0
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1answer
46 views

Avoiding heavy controller boards in a MEMS sensor circuit

I am very new to the circuit designing and the "Internet of things" world. I am trying to put together, for simulation purposes, a system that can pull information from a mems accelerometer sensor and ...
0
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0answers
23 views

hall effect sensor as a toggle swich for a 12v strip of LEDs

I'm trying to use a unipolar hall effect sensor as a power switch to turn off and on a 12V strip of LEDs, powered by a 12V 6.6Ah battery. I just tested the current draw of the LED strip with a ...
0
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0answers
27 views

mixing parasitic powered 1-wire devices with others which are not. All in a star topology

I'm designing a 1-wire network with star topology. Number of branches will be 4 - 6. Each branch will connect two devices. One temperature sensor and one PIO-device 5 V will be supplied to the ...
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1answer
58 views

Voice controlled robot [closed]

Suggest me book name or link to study for voice controlled robot (DSP on matlab for voice recognition). What is the hardware module/ sensor for voice recongnition?
0
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1answer
56 views

What sensors can accurately detect size of content in a closed container such as number of pills in a pill box?

I am a DIY enthusiast playing with different sensors and electronics. Recently I've been trying to make a pill box for my grandparents to track their medicine intake. However, I cannot determine ...
0
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0answers
48 views

Ultrasonic distance sensor with no microcontoller

For a task we have to come up with a way to use a 40 kHz ultrasonic transmitter and receiver pair to measure distance. The output must be an analogue signal proportional to the distance to the object. ...
0
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1answer
41 views

Passive RFID with small size, light, cheap and range in meters for a reader

I'm a software guy so a bit on deep waters here so I thought I'd ask here. :-) I'd like to understand if it is possible to have an RFID tag with the following properties: weight: a few grams, size: ...
1
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3answers
69 views

Electrical noise sources in farms

I am designing the data logger of a solar-powered automatic weather station that will be installed in farms. It's used to gather data from environmental sensors (wired) and send it to a host using the ...
1
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1answer
118 views

Reading car speed sensor (SDV)

I've been trying to interface with my car's info screen, called a TID (Triple Information Display), from Opel. From the factory, there are multiple things attached to this screen, one of those a line ...
0
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0answers
35 views

Rope vibration/touch sensor

I need your help. I need to find a way to sense wether a tense rope is being touched or not. Another way it should work is measuring if the rope is vibrating. I don't have limitations on the rope ...
0
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2answers
143 views

Arduino interface with I2C Pressure Sensor

I have a Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor that I want to read using an Arduino. Looking at the datasheet, I know that the I2C address is 0x28, and I have had a play with bits of code ...
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0answers
78 views

Tips for improving this PT100 sensor amplifier circuit?

I'm designing a circuit to read a PT100 temperature sensor using an OP-amp and the ADC of a PIC 16F1788. I've designed the following circuit: The PT100 sensor is labelled PT100. The basic idea is a ...
0
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1answer
63 views

Methods/sensors for making a “smart floor” to detect human presence via floor?

I am looking into making a "smart floor" that can detect when someone steps down onto it. I have done some research and found that the most commonly used sensors are 1) Pressure sensitive floor tiles ...