Questions tagged [sensors]

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

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57 views

Reading sensor with current ouput with Arduino

I am having diffuclt times with this sensor, so I kndliy ask for your help! The sensor is named "SPUVA-CS-C3535-A", datasheet here. The sensor I use (cs3535) has just two pins (+ and -). From my ...
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87 views

ESP8266 GPIO limitations with HC-SR04

I want to build a systems that measures if some parking spots are occupied or not. I chose to use an ESP8266 12-E NodeMCU Kit with multiple HC-SR04 ultrasonic sensors. In my project, it is essential ...
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1answer
378 views

How to calculate the RZERO value in MQ135 sensor, I have already burned it for 24 hours?

I've already burned it for 24 hours and it is now giving the constant value of 932.36,pls tell me how to calculate the RZERO value.
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86 views

How to use any module that has no library for arduino?

I am 2 years old in this Arduino world. I am currently working on a project where I am about to make use of a fingerprint sensor. Now my question is that could we be able to make use of a sensor that ...
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1answer
142 views

Does using multiple HX711 amplifiers change the supply voltage of an Arduino?

I’m creating essentially a load cell using an Arduino Nano and an HX711 amplifier. However, I want to have two HX711 amplifiers running off the same Arduino. Will that change the supply voltage since ...
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1answer
41 views

Running a robot with 2 front-facing sensors, but it's stuttering

Here's the run down: I have a small robot with four continuous servo motors and two ultrasonic sensors. It's run by and UNO board with a Sensor Shield V5 on top. My goal is to program the front right ...
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1answer
53 views

how to combine two code of arduino uno [duplicate]

int mamank=13; void setup() { pinMode (mamank,OUTPUT); Serial.begin(9600); } void loop() { int sensorValue = analogRead(A0); Serial.println(sensorValue); if(sensorValue>550)digitalWrite(...
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2answers
48 views

Distance Measurement - between 6 points, individually moving in (almost) any direction within 1m

I'm trying to find a solution for a given task in a problem I want to solve. Assume I have 6 individual Points in a 3D environment of about 1m³. Each point will be able to change position (almost) ...
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3answers
2k views

Voltage divider and NodeMCU inputs

Some sensors give as output a voltage between 0 and 5V. The analog inputs of the NodeMCU require voltages between 0 and 3.3V. I plan to make a voltage divider with two resistors like in this link for ...
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1answer
49 views

Can you make Arduino Uno send information through a WiFi module to a server?

A lot of tutorials are about how to control Arduino through WiFi, but I need my Arduino to send information about motion sensor activity to a server. Is that possible?
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26 views

How to run my servo until an input is recieved?

I am VERY new to this so please excuse any silly questions. I am trying to run an FS90 micro servo in a sweeping motion until I receive a certain value from my Adafruit TCS34725 colour sensor. I ...
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1answer
85 views

How many PIR Motion Sensors can I connect to my Arduino-Uno R3?

I am doing a school project where I intend to measure the cafeteria line with motion sensors and the send that information with a WiFi module to a server. This is my first time using Arduino and I am ...
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1answer
210 views

Get image from Fingerprint module

I want to get the image from the fingerprint module (https://makeradvisor.com/tools/fingerprint-sensor-module/) as a result of scanning. It is enough to have a single frame image. it would be good if ...
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2answers
98 views

Sensors / Data logging Temperature and Humidity 50ft away [closed]

I am looking at using a DHT11 for logging my temp and humidity in a few boxes i have. I need to be able to run these sensors several feet away (50ft ish) I would like to use Ethernet cable to do this....
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1answer
98 views

Error compiling code for Arduino/Genuino Uno. “multiple definition of `__vector_7”

#include <PulseSensorPlayground.h> int pulsePin = A0; // Pulse Sensor purple wire connected to analog pin A0 int Redled = 7; // The pin for the Red LED which notifies you if ...
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2answers
101 views

Pressure Switch 4-20mA

Im working on a project trying to read the pressure value from an Allen Bradley Pressure Transmitter 836P-D2NFGB20PA-D4 Ser.A However the pin configuration that comes on the description along with ...
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1answer
277 views

Sparkfun CCS811 sensor not interfacing with arduino

I have sparkfun indoor air quality sensor CCS811 which needs to be interfaced with arduino. I have soldered wires on the sensors and connected with arduino. Have checked the connection with multimeter ...
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1answer
97 views

Plant irrigation system

I'm very new to the Arduino game I wanted to make a small auto watering system for my plants. I bought these items 5V 1 CHANNEL RELAY MODULE FOR ARDUINO PIC AVR DSP ARMB 9 VOLT BATTERY SNAP ...
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34 views

Dim 4k LCD panel in response to ambient light

Warning: I'm completely new to Arduino, and not even sure if it's the right solution here. I'm trying to make a better digital picture frame. Got almost all the way there by just buying a nice flat-...
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50 views

Dragino Lora shield for Arduino sensor use

I am new to arduino and lora technology and i have dragino lorashield for arduino Uno and dragino gateway. I have also MQ-3 gas sensor and I want to detect the alcohol value and to send it to the ...
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1answer
607 views

How to detect the direction of rotation with a sensor encoder timing disk (photoelectric speed sensor)?

I am making a DIY gaming steering wheel and am stuck. For measuring the rotation of the wheel, I'm using a sensor encoder timing disk, which is usually found in printers. - https://robu.in/product/...
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1answer
125 views

How can I make YX5300 MP3 player play song in a loop?

I am doing a Christmas project and I have an ultrasonic sensor that detects if a person is In front of it. I want that if someone is in front of it, it lights up LEDs, which it does, and it also has ...
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1answer
80 views

Arduino code for turning an led on by one clap and then off by one clap

I want my Arduino to turn on a LED when sound sensor detects a clap (noise) and keeps the LED on until the sound sensor detects another clap (noise) which turns the LED off. int Sensor = A0; boolean ...
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9answers
5k views

Lock screen if I leave my seat?

Background: I change the job and in the new company you need to pay pizza for the whole team if you forget to lock your screen :-) I want it to be automated: I walk away and the screen should lock. ...
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0answers
92 views

Need help in the problem with analog input readings and RTC DS3231

I have 3 analog input(0-1024). I want two outputs based on levels of analog inputs. Eg. inputs have 2 levels. for A0 at 300,digital output pin3 turns ON; and A0 at 500, digital output pin 4 turns ON. ...
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1answer
264 views

Trying to read different gas levels with MQ2 Gas Sensor

I found a link on how to connect MQ-2 Gas Sensor to Arduino Uno. http://electronicsprojectshub.com/how-to-connect-mq2-gas-sensor-to-arduino/ After I bought all the parts and tried it out, the sensor ...
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2answers
60 views

How can I combine this two codes in one program? And use it in javafx application

The first one reads from sensors and displays it, the second code receives an incoming byte to control LEDs. I tried to combine it but i don't know why it doesn't work. Please help me out. I need it ...
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3answers
178 views

Arduino ultrasonic sensor weird output

So I just got into arduino and bought Elegoo's car robot v3 kit and built it, but when I put the robot on "object avoidance" it constantly spins as though there is an object in front of it. I tried ...
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1answer
415 views

Why does the reading on the ESP32 read max, when the reading on UNO read accurately?

I have a 'Capacitive Soil Moisture Sensor' hooked up to my Uno. Very simple code. AnalogRead(MoistureSensorPin); This will return a differing value that I can work with. When applying the same code ...
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0answers
58 views

I'm trying to use a CONZIR CO2 sensor to find CO2 concentration

Hey I’m a beginner Arduino user trying to use a CO2/Humidity/Temperature sensor to read in the atmospheric conditions near the sensor and then control a heating pad and solenoid valve to adjust the ...
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1answer
28 views

choosing prober controller to measure engin speed changes

In order to monitor engine speed changes in real time, sensor is detecting the motion of few magnets around a disk driven by the motor. 1st approach Hall effect sensor signal is regulated by LM393 ...
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1answer
50 views

Trying to measure distance using an ultrasound sensor

I am relatively New to Arduino and need your help. Actually i made a code and the problem is that the ultrasound sensor doesn't work at all. It isn't displaying the distance between the object and and ...
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1answer
67 views

I need some help getting data from a rangefinder

I have wired up my range finder (CJVL53L0XV2) to a breadboard for testing and have run the arduino example code for the rangefinder. The rangefinder works, but I do not know how to take the distance ...
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1answer
87 views

How to get air speed, which sensor to use?

I want to measure the airspeed on a flying vehicle and get the data with arduino. Note that, there will not be any control mechanism on the flying object, it will be flying mechanicaly/passively, I ...
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1answer
71 views

Compass heading not varying linearly

I am using an HMC-5983 magnetometer compass on my arduino uno to find the heading of a car I'm building.But my compass readings aren't varying linearly.For example when I physically turn my compass by ...
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2answers
90 views

Will an Arduino Uno be able to read 3x incremental encoders?

Encoders are quadrature 600ppr encoders with X2 counting. Therefore 1200 counts per revolution for each encoder. Is there an edge rate limit? I currently have one encoder hooked up using code with ...
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2answers
428 views

ESP32-CAM not reading BME680

I am trying to read BME680 on ESP32-CAM with following code : (Before trying BME680, I have suscessfully connected BME280 to ESP32-CAM over S/W SPI) #include <Wire.h> #include <SPI.h> #...
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0answers
36 views

line following IR sensor not giving readings at 3m wire length?

I am using line following IR sensor with arduino mega. I need the sensor 2-3m away from arduino since the length of rover is 2m (sensor front & motor back). However, I cannot get accurate analog ...
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0answers
38 views

My GPS coordinate does not show. Only my ultrasonic output came out

#include <TinyGPS++.h> #include <SoftwareSerial.h> static const int RXPin = 4, TXPin = 3; static const uint32_t GPSBaud = 9600; // The TinyGPS++ object TinyGPSPlus gps; // The serial ...
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0answers
82 views

Will this code for braking of dc motor using sensor work?

#define trigPin 13 #define echoPin 14 #define e1 10 // Enable Pin for motor 1 #define t1 8 // Control pin 1 for motor 1 #define t2 9 // Control pin 2 for motor 1 #define led 3 #define led2 5 #...
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3answers
303 views

Issue connecting heartbeat & temperature sensor on arduino uno but working individually

So the code is working individually for temperature sensor and for heartbeat sensor but when i combine it together it shows wrong values for the temperature sensor I'm using lm35 temperature sensor ...
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0answers
132 views

Reading from an oven humidity sensor

I have been trying to solve the problem of humidity sensors in a harsh environment (BBQ/Pizza Oven) and I came across this: enter link description here But I don't see any documentation on how to ...
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3answers
344 views

Does a pulldown resistor use less battery power than a pullup resistor?

I am designing a circuit connected to a simple open-close sensor, like a switch. For ease of construction, the circuit with the sensor switch closes to ground, and uses a 1 MΩ pullup resistor to Vcc ...
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1answer
72 views

PIR Sensor Gives False High in 55 Minutes (Can't find a way to solve)

I have built a system to identify motions and fire alerts. System can send a SMS in case if it's identify such alerts. System consist of two parts, Part 1: Armed and Disarmed using a PIN (Using ...
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1answer
25 views

Arduino uno + 5 IR obstacle sensor

I have IR sensor with current draw 100ma i have to connect 5 of them is i can connect all 5 with arduino directly or i have to use external power suplly for them
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1answer
55 views

How many sensors can be used in arduino for my project?

I'm doing a project on water purity finder. I dont know which arduino board can be used for the project. It uses upto 15 sensor modules excluded display, WiFi module. Can you tell me which board is ...
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2answers
399 views

Noise on piezo analog read due to Arduino power supply

I am making a device that measures temperature and vibrations and records the values onto an SD card. It will be a standalone device. The hardware used: - Arduino Uno - PCF8523 RTC clock - MAX3186 + ...
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1answer
795 views

Does AWG size affect signal from sensors?

Would using a thicker cable like 16 AWG affect the signal being received from an RFID or Ultrasonic sensor? I understand AWG can make a significant impact on voltage when a thick cable is used over ...
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0answers
69 views

Arduino code does not function when relays are powered

I have a mega arduino, which is supposed to to power 4 relays using 4 touch sensors TTP 223, the relays are 5V coil and 220V. the arduino is powered by a 5 V adapter "mobile phone charger" and it ...
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1answer
35 views

Serial.println Issue with Flame Sensor

I'm really new to coding and Arduino so I would be eternally grateful for the help. I'm trying to make a really basic flame sensor that beeps, lights up an LED and displays the distance from the ...

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