Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
0
votes
0answers
10 views
Compact wide-angle digital distance sensor [on hold]
I have used the Sharp GP2Y0D340K sensor for in my previous mini-sumo project; however, the sensor is out of their production line now.
The same applies to ...
0
votes
2answers
51 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 ...
0
votes
0answers
26 views
qrd1113 vs qrd1114
Does anyone know the differences between qrd1113 and qrd1114? The datasheet doesn't include any information on the topic.
-2
votes
1answer
27 views
Availability of High voltage DC transducer of rating upto 1Kv DC [on hold]
I am currently using LEM LV-25 Voltage transducer for sensing DC Voltage in my system. The supply voltage for this transducer is +/- 15V DC.
Is there any other similar devices (cost effective) which ...
1
vote
1answer
39 views
How to dive into IoT world with just high-level programming experience [on hold]
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, ...
1
vote
0answers
23 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 ...
0
votes
0answers
29 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 ...
1
vote
1answer
36 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. ...
0
votes
2answers
57 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 ...
-2
votes
2answers
66 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 ...
0
votes
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 ...
-2
votes
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
votes
4answers
101 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
votes
0answers
11 views
“Deriving Spatial Information’s from a Distributed Set of Data Acquisition (DAQ) Systems” [closed]
The distributed set of Data Acquisition (DAQ ) might be just a bunch(or 3) of Raspberry Pi computers with similar sensors and a GPS (for location and timing). For this topic, ...
-4
votes
0answers
31 views
Pressure sensing back brace [closed]
I have this idea for a project which is to have back brace incorporate pressure sensors so that when the user applies pressure, such as through moving side to side, the sensors will detect this and ...
3
votes
1answer
41 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, ...
-2
votes
0answers
31 views
meauring distance using ultrasonic sensor with atmega32 code bug
what is the wrong in this code ? when i run it on atmega32 the uart send 000 one time and the code does't repeat !
the code should measure the distance using ultra sonic and display it using uart ...
-1
votes
1answer
119 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 ...
0
votes
0answers
14 views
Capacitive touch sensitive circuit with impulse output [closed]
I need to set up a capacitive touch sensitive circuit to generate impulses for the digital circuit after my sensor circuit.
The circuit should send impulses (say 5 V) when the capacitive surface is ...
0
votes
0answers
8 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
votes
0answers
8 views
MPU9255 IMU not fetching magnometer data [migrated]
I'm using a 10 DOF IMU with an MPU9255 and a BMP180 to collect orientation data. When I run a sketch for arduino that I downloaded to test the IMU's capabilities, it collects the data from the ...
0
votes
2answers
58 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
votes
0answers
65 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 ...
0
votes
2answers
33 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 ...
-1
votes
1answer
54 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 ...
1
vote
1answer
29 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 ...
0
votes
2answers
79 views
MEMS: why INS + GPS? [closed]
I have read in the Internet that in the most cases people prefer using INS (accelerometer + gyroscope) + GPS sensors. I have read they can compensate each other errors, but is it possible to obtain ...
1
vote
1answer
57 views
2 Pin Flame Sensor
I recently found a 2 Pin flame sensor. It looks just like an LED except it's black. It is not a module and I couldn't find any wiring tutorials for these, just for modules. Does anyone know how to ...
0
votes
1answer
68 views
AD620 in Proteus: timestep too small
I've made this circuit in Proteus, as a part of a practice report:
In real life it works, as I built and tested it. But in Proteus, when I want to run the simulation, I get these errors:
...
0
votes
0answers
33 views
analog sensor on Beaglebone Black that generates voltage
As I look at the sensors that people recommend for the Beaglebone Black, they mostly seem to recommend resistive sensors--photoresistors and the like. Connect it to the 1.8V source and an analog in ...
-1
votes
1answer
37 views
interface two wire pH sensor with arduino
I have purchased this pH/EC sensor from https://www.cooking-hacks.com/ph-sensor however it does not have a BNC connector and just two wires, black and read. How could i interface this to an Arduino?
...
0
votes
0answers
34 views
AM2302/DHT22 outputs strange values
I bought a couple of AM2302/DHT22 (temperature and humidity) sensors, which should have an adequate accuracy (2-5%RH and 0.5°C). After testing them indoors for a while now, I am quite disappointed, as ...
1
vote
1answer
24 views
Closed Loop 4 Sensor Control System
I have 4 on/off motors running individually (call them M1, M2, M3, M4) and 4 ping sensors (call them X1, X2, X3, X4) with a board placed in front of the motors and sensors. As the motors move forward ...
0
votes
2answers
59 views
Damage logger by removing LED from circuit? [closed]
I have this data logger that we are using for temperature and rotation measurements. Unfortunately it came with an LED, which we need to get rid of for our study.
I really don't know much about ...
0
votes
1answer
115 views
Triangulation Vibration Sensor Impact Detection Position
I am working on a project to detect the position of an impact using three vibration sensors each one of them linked to a micro-controller(in my case STM32F4) .
Using ADC and UART ,I can plot with a ...
0
votes
0answers
36 views
Trying to build a speech detector using a piezoelectric sensor on the throat
I'm currently doing a project on my university in which we need to build a device to detect that someone is speaking (we don't need to understand them). We are using an ESP8266 wifi module to collect ...
0
votes
1answer
28 views
Multiple Hall Effect sensors to one input
I've done some work in the past with hooking up Hall Effect sensors, e.g. OH090U up to an Arduino. Please note, I do have limited electronics knowledge.
What I would like to know is if it is possible ...
0
votes
0answers
37 views
Two Ultrasonic Sensors facing each other inside the Deadband
Lets say I have two ultrasonic sensors facing each other inside the deadband or blind zone.
The first one transmits and then switches to receiving mode, the second one as soon as receives waits a ...
0
votes
0answers
52 views
Level shift and amplify battery voltage for ADC input
I have an 8s LiPo battery (ie 8 x 3.7 V nominal cells, ranging from 25.6 V low capacity to 33.6 V full capacity). This is connected to a motor controller that provides a 5 V regulated supply to my ...
4
votes
1answer
76 views
How can I describe mathematically what is happening in my home made LVDT variant?
I've built an LVDT (Linear Variable Differential Transformer) that is a little different than how it is conventionally done with 2 secondary coils positioned adjacent to a primary coil. My design is a ...
-2
votes
1answer
64 views
Wire soil moisture sensor such that it only powered when measuring
I am a rookie electronics tinkerer who wants to use the SparkFun soil moisture sensor. I plan on connecting it to ADC MCP3008 to the GPIO pins on a Raspberry Pi. On the SparkFun site the vendor warns ...
0
votes
0answers
29 views
How to measure abdominal girth (measurement of the distance around the abdomen) using sensors?
I need to come up with a way of measuring the abdominal girth using some sensors with an accuracy of at least 0.5cm. It will be used to monitor patients in a hospital. It has to be totally automatic ( ...
0
votes
0answers
26 views
Problems coding a 12 pin 7 segment display and grove temperature sensor with arduino uno [migrated]
Hi I am trying to code my 12 pin 7 segment display to display the temperature from my grove temperature sensor. I am new to this and I have been struggling if anyone code help that would be muchly ...
0
votes
0answers
11 views
I need help purchasing components for my Arduino project [migrated]
I am a newbie on this hardware stuff. I need help on purchasing the components
Brief description of my project
I need a device that would remotely detect weight or pressure when somebody push on it ...
0
votes
0answers
13 views
tsop1738 for obstacle detection
i'm using a tsop 1738-ir receiver- for obstacle detection, the problem is that the output returns to high level when the tsop receives a continus 38kHz more than 1s. so it would be very difficult to ...
3
votes
2answers
48 views
Difference between ultrasonic transmitter sensor and ultrasonic receiver sensor?
What is the difference between ultrasonic transmitter sensor and ultrasonic receiver sensor?
Can an ultrasonic receiver sensor be used as an ultrasonic transmitter sensor or vice versa?
2
votes
1answer
327 views
Using Ethernet cables cable for sensor wiring
I'm exploring the pitfalls of using an Ethernet cable for extending sensor cabling.
The term Ethernet cable is used ambiguously on purpose to denote an "easily available 8-wire cable whose category ...
0
votes
0answers
43 views
How to correctly use an ultrasonic transducer
I want to build an acoustic tape measure device composed of an emitter and a receiver that are time-synchronized. The emitter will start emitting at time t and the receiver placed at some distance d ...
1
vote
5answers
103 views
How to design a AC current detection switch?
I am working on a home automation system and I need to detect if a appliance is getting power or not. Basically, I need a AC current detection switch which can be mounted on a power line and sends a ...
-2
votes
2answers
133 views
PIR sensor always gives HIGH
This is my first time to use PIR (HC-SR501 ) . It's in repeat trigger model. But when I test the output of the PIR , it gives always HIGH .
I rotate sensitivity adjustment and time delay adjustment ...
