Questions tagged [sensors]

Use this tag for questions about selecting, connecting, using, and debugging sensors.

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15 views

What is the advantage of using a 4-20mA shield rather than directly measuring the voltage drop?

I would like to measure a sensor which uses a 4-20mA current output. The easiest way would be to set the voltage drop to around 5V using a 250 ohm resistor and measure the voltage using the analog pin....
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1answer
37 views

Distinguishing between multiple Infra Red Transmitters [on hold]

I am working on an Arduino project where I use an infra red camera along with 4 transmitters placed each on a corner of a square platform to park a robot perfectly on this platform. However, it is ...
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29 views

AD8232 picking up monitor signal on UNO

I have a AD8232 ECG sensor hooked up to an Arduino Uno following the Sparkfun guide. I do get a good clean signal, but only if I am a good 3m+ from my monitor. Otherwise I pick up a strong 50Hz signal....
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14 views

Suitable long-term sensors for PM, Ozone and NO2

I am totally new to Arduino. I have a Arduino Mega 2560 and I would like to perform long-term observations of PM, Ozone and NO2 (for around a year, outdoors). Do you have any ideas which sensors ...
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41 views

Using the YS-IRTM with an Arduino Uno

Picked up a YS-IRTM IR Transmitter/Receiver module to do some testing for a project. There's not a lot of details on it but eventually came across two very important sources: Translated Module ...
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29 views

Capacitive Moisture sensor only shows values 1 and 2

I'm new to Arduino and electronics in general. I'm trying to connect the Capacitive moisture sensor v1.2 to my arduino and get values in the serial plotter. I connected the VCC to 5V, GRD to ground ...
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19 views

Serial Communication between arduino uno and esp8266-01 [on hold]

i want to send ultrasonic sensor value that connected to arduino uno to esp-01 module for send it to firebase, how can do that with code and connections arduino code void setup() { Serial.begin(...
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15 views

Sending sensor data from Android app to arduino via USB Serial

I've searched this and have only found solutions for receiving data FROM Arduino TO android, I need the opposite. I basically need to figure out how to press a button from my android phone that will ...
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1answer
31 views

Arduino UNO - Fluctuation of inputs and outputs

I have some pots (100K) on my Arduino board. When I raise the value of one those resistance other pots are being changed (Not too much but it's significant). I have no idea what's going on. I tried to ...
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22 views

Capacitive Sensor and Thread

Looking for a great way to detect when someone touches thread, or if 4 people touch thread etc. I'm not looking for a hand count, but I'm going to try to translate it into MIDI for use in a project. ...
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26 views

Optical mouse sensor M116504386 arduino libary

I am doing project and I used optical mouse IC sensor M116504386 with 16 pins and I don't know how to get this sensor libraries to interface it with arduino uno.
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35 views

Combining code for multiple sensors in one program (Arduino)

I need to operate 2 different sensors (gas and DHT11) simultaneously. I have managed to run each one of them separately and I don't know how to manipulate the code so they could work together. Here ...
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1answer
25 views

How to wire a hall effect sensor to arduino?

it's a UGN3503 hall effect sensor, in some schematics they used a 100uf capacitors and data connected to analog pin and in some a pull up resistor and data connected to digital pin. as someone new to ...
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1answer
30 views

Water pump controlled by soil moisture sensor

I'm just learning to code in Arduino. The purpose is that first the sensor measures the moist level (I mapped the reading values from 0 to 100). If the value is less than threshold 70, then it will ...
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1answer
52 views

Help combining digital and analog code in arduino programming

So I'm making a device that does 3 things, Measures frequency of an audio signal through a microphone Checks whether there is a weight placed on a pressure pad (my pressure sensor works through the ...
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1answer
39 views

Problems with controlling LED with soil moisture sensor

I'm a beginner at Arduino. I have a soil moisture sensor and I mapped the lowest and highest moisture value to a value in between 0 and 100. What I was trying to do was if the value was less than ...
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40 views

Waking up a NodeMCU when force load is applied to device

I am currently designing a device that will take measurements from a load cell that is in tension. I am using a v1.0 NodeMCU device that features an HX711 load cell amplifier and is running off of ...
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1answer
42 views

How to start a dendrometry dimension build (Dimensions of Trees) for research?

I am looking to build a device that can measure the dendrometry fluctuations of trees (etc). I essentially want to build this https://publiclab.org/notes/kinasmith/09-09-2016/dendrometers to a t but I ...
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1answer
27 views

Increasing speed of Vl6180x Sensors

I have 5x vl6180x pololu ToF sensors. I have managed to hook up all of the sensors to the arduino via I2C by making each sensor startup at different times and when they do, changing their addresses, ...
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1answer
69 views

How can I measure the point of contact between two wires? [closed]

I'm not sure the best way to ask this question, so I'll try to explain what I'm looking for, and roughly what I think is involved. I want to measure the point of contact between two wires. This seems ...
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22 views

ACS712 Module inaccurate reading in some devices

I'm currently trying to isolate what's the problem with a current sensor build I'm working on right now. I'm using a ACS712 that can handle 30A, I've used the code at http://henrysbench.capnfatz....
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3answers
58 views

DHT11 sensor providing -999 outputs

I'm new here, trying to learn Arduino by hacking, that is plugging stuff in, looking for code and then trying to understand it bit by bit so I can move on to bigger and better projects. My issue is ...
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39 views

How do I connect my Arduino to a FT-H30 thermal sensor?

I want to use my Arduino to measure from a thermal sensor that I’m not familiar with and I'm trying to figure out what are the proper steps to take. The device is a FT-H30 thermal sensor with FT-50A ...
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1answer
44 views

Can a Arduino Uno handle all these components?

Its my first project with an Arduino, so please bear with the dumb questions. For this project of mine, I need an Ultrasonic Sensor, a Gyroscope, a Buzzer, three push buttons and an 16x2 LCD. Can ...
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1answer
52 views

2 analog sensors, pulse sensor and LM35 problem [closed]

I make a project in which I use two analog sensors. A pulse sensor and the LM35 temperature sensor. When I use them separated everything is normal,the codes are fine, when I combine them the lm35 is ...
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1answer
44 views

Septic tank project [closed]

We are to make a project.We have to connect MQ7, buzzers and lights to Arduino. And one buzzer will make sound when gas reaches high level and another buzzer will beep when gas level is very low.. ...
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2answers
70 views

Is there a digital/ultrasonic Anemometer for Arduino?

I use Arduino DUE and I noticed that many forum users use the TX-23U Wind Sensor. https://www.amazon.com/Crosse-Technology-TX-23U-Weather-Stations/dp/B0016MYA7U Also, many people tried to create a ...
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2answers
44 views

Two sensors using I2C

We have two sensor one of them(MPU6050-gyro) is communicating using I2C, the other is via SPI(SD card reader). Now, we need an additional component as a sensor that the barometer which communicates ...
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1answer
16 views

Can I use TCS34725 Color Sensor with Lilypad?

I have been trying to get TCS34725 color sensor working with LilyPad Arduino USB - ATmega32U4 Board but with no success. I am wondering if it possible? I have been using the following Sketch to try ...
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1answer
73 views

LM393 Speed sensor - Counting pulses

I'm trying to calculate de rotation speed of a dc motor. I'm using the sensor shown in the picture and a slotted disk attached to the motor. The results I was getting made no sense and after several ...
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1answer
24 views

I am not able to set the correct configuration of sound module

I have been trying to make sound reactive LED lights but my sound module is detecting only very close voice the LED react only when I press it to the speaker with my hands I have tried to set the ...
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2answers
96 views

Value read is not changing while rotating pot in arduino?

I am trying to read voltage using analogRead in Arduino Uno from a voltage divider circuit consisting of 1k resistor and 10k pot. The Pot used is bourns 3296. The values obtained only range from 1011 ...
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17 views

how spilt the sensor values then use them to control servos in nodemcu v3?

#include <ESP8266WiFi.h> #include <WiFiUdp.h> #include <Servo.h> const char* ssid = "Ece Control"; const char* password = "myphonewifi"; WiFiUDP Udp; unsigned int port = 5514; char ...
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1answer
52 views

Connection of a DS18B20 on a Arduino pro mini

I'm actually trying to connect a DS18B20 sensor to a homemade board build with a ATmega328P processor running with a power of 3.3V and at 8 Mhz. In order to get the address I wired the board as the ...
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1answer
43 views

What is the maximum number of sensors that can be operated on a single Aurdino unit

I currently have an Aurdiuno uno and a motor driver shield: (http://www.hobbytronics.co.uk/arduino-motor-shield). Now, I would like to run the following mechatronic devices: 3 bi-direction motors, 1 ...
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0answers
47 views

Help Connecting Lidar sensor over SPI to arduino Due?

I'm very new to Arduino and have never used the SPI protocol before. I've tried following tutorials online, but my SPI.transfer always returns a value of 255 whether the sensor is connected or not. ...
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1answer
202 views

How to calibrate and use MQ-7 gas sensor? [closed]

Could anyone help me calibrate and use the MQ-7 sensor? I've read guides, but some say I need RO, offset or heating cycles for calibration.
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0answers
63 views

What sensor do I use to measure the intensity of direct sunlight?

I'm trying to measure how bright the day is on a particular day to see how it affects plant growth. The brightest sun can be 120,000 lux. It possible to measure such a large brightness? What sensor do ...
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1answer
35 views

How to get 3v3 pins on Arduino Mega Sensor shield v2.0?

I am using Arduino mega and a sensor shield (picture attached below). I need to connect three different wires to 3.3 V input. Can anybody suggest how can I achieve the same? What voltage do the VCC ...
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1answer
206 views

Triggering an ultrasonic sensor

I made a smart blind stick for my class project. It uses an ultrasonic sensor to detect obstacles and I was asked this question in VIVA... Why is it necessary for giving a digital high for 10 &...
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1answer
49 views

My Code turns on my LED even when my switch is not pressed

I am trying to create a circuit that will turn my motor when I clap. When the first limit switch is low, and there is only one clap, a solenoid pin is supposed to be engaged (currently an LED), but ...
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0answers
117 views

MQ7 Flying Fish output format

I am new to Arduino project. I used MQ7 flying fish sensor to sense the CO. Ok now I connected everything as mentioned in various tutorials, such as Arduino CO Monitor Using MQ-7 Sensor. Also wrote ...
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0answers
43 views

Problem in integrating speed sensor LM393 with L298N

I am currently working on a project that has an automatic support wheel for bicycle. The mechanism of this project is when the speed sensor is detecting the RPM of the rear bicycle wheel it will ...
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1answer
42 views

Please answer this [duplicate]

what is the difference between transmitting and receiving leds(circled) connected to sensor board and ir emitter and receiver diode shown in second pic?Will the output change it i replace the former ...
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1answer
53 views

How to calibrate the MQ7 sensor module?

I recently bought a MQ7 sensor module like the one in the attached picture. I have read several tutorials, and they're all different. Some of them says that i need to connect the module directly to 5v ...
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2answers
42 views

May mulitple sensor connect to one arduino uno board since they shared same pin? [closed]

i am a Arduino beginner here. I start knowing about Arduino since my supervisor give me this project. In my project , i need to invent a car safety system to avoid animal hurting that hide under ...
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1answer
69 views

Why LCD 16x2 cannot display “water leaking” when rain sensor detects water?

#include <SoftwareSerial.h> #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); SoftwareSerial mySerial(0, 1); int gas_sensor = A5; int water_sensor = 8; int buzzer = 9; int ...
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0answers
98 views

Multiple Servo motors with an ultrasonic sensor

I am building a robot arm with 6 servo motors that works with an ultrasonic sensor. The purpose of the program is when an object is detected at 20 cm (fixed position) from the sensor, the buzzer and ...
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1answer
97 views

I'm getting NaN for readings on my DHT22 sensor when using 3v3 pin, but not 5v pin

I have a DHT22 temperature sensor and DS1302 RTC module connected to the 3v3 pins on an Arduino Nano. Both the sensor and the RTC module are rated to work on either 3.3V or 5V, but the recommendation ...
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0answers
83 views

How to build image with ultrasound sensors HC-SR04 [closed]

There is a simple algorithm on Wikipedia: how to build ultrasound image. And I want to build one. Resolution and presision are of no importance, I just want to do this for the case of study - I want ...