Questions tagged [sensors]
Use this tag for questions about selecting, connecting, using, and debugging sensors.
1,248
questions
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Processing Serial data
I have a PM10 sensor that I'd like to get the values from.
Here's the official documentation from the sensor:
I've looked as serial communication, but how do i process byte by byte of information ...
1
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1
answer
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What if Ultrasonic sensor doesn't detect object?
I am trying to write a sketch where a function will only be triggered when the ultrasound doesn't return back. Thus when the echo pin is checked after 1 second after the trigger pin was written high, ...
0
votes
1
answer
302
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Details on OV7670
I am thinking of working on a project based on a camera module OV7670. I am making a security system using an arduino where detected motion (I am also using a PIR sensor) will trigger the camera ...
5
votes
4
answers
707
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Briefly "wake up" Arduino in response to an event
I want to connect a device to a door handle, so whenever someone opens the door I'll be able to send a message via my arduino that is connected to a WIFI shield.
I have a simple orientation sensor, ...
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4
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I want to pour 500ml of Water in jar with Arduino water flow controller?
I want to pour 500ML of water with Arduino water flow controller with maximum accuracy.
How will I get the maximum accuracy with this sensor?
Could someone can give suggestion for accuracy or any ...
6
votes
1
answer
8k
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Compute yaw from magnetometer and accelerometer
I use an Arduino and a 9 DOF sensor (gyroscope, accelerometer and magnetometer) and I'm trying to use the pitch, roll and yaw that the sensor gives me to rotate an object in unity.
I managed to ...
2
votes
1
answer
437
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Module and library for self healing large sensor network
I have to build a wireless sensor network with arduinos on my project. It does not need to be a mesh network, but it needs to have self healing capabilities.
I would like to use something cheaper ...
1
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1
answer
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ACS712 sensor reading for AC current
I'm trying to track down a clearly/simply articulated piece of code to take a reading from the ACS712 current sensor (link to download PDF data sheet).
I understand that these sensors are noisy, and ...
2
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3
answers
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Arduino ultrasonic distance meter doesn't display correct distance
The Arduino distance meter that I made doesn't display the correct distance. It just displays "0.0 inches".
Here's the code I used:
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, ...
4
votes
2
answers
410
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How to have precise measurements
I need to display measurements of a sensor which need to be presented on a precise time-scale.
Since the loop function is not quite precise, how can i make sure that i can measure at say for example ...
0
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2
answers
546
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detecting presence inside - PIR or ultrasound?
(I am professionally a software guy working in the GCC compiler with MELT, so I am fluent in software, but much less in hardware - I did use a solder for a 74LS00 nand gate based stuff in the 1990s. ...
2
votes
0
answers
211
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Declaring Variables in a For Loop
I am trying to use a for loop for getting readings on two parallax ping sensors and want to find the difference between both readings.
But am having trouble doing so. Whenever I declare print ping(1), ...
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3
answers
1k
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Options for measuring position of garage door
I'd like to be able to measure the position of my garage door. Determining if the garage door is fully open or fully closed should be fairly simple with some magnetic reed switches but I'd like to ...
0
votes
1
answer
2k
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RobotLinking 18B20 pinout and circuit board weirdness
I have a Dallas Semiconductors 18B20 temperature sensor on a RobotLinking board. It's part of the RobotLinking 37 Sensors Kit. The board has a LED to indicate activity. It resembles this:
Here's what'...
2
votes
0
answers
224
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How do I change the default number of parameters SDI 12?
I am a nooby so this might be an obvious answer kind of a question, but how do I change how many parameters arduino-uno reads from a sensor using SDI communication? My code (which was in public domain,...
3
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2
answers
2k
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How to wire an analog IR sensor for digital input?
How do you wire a phototransistor so that it outputs a clean digital signal in response to certain light levels?
I've wired a QRD1114 to an Arduino analog pin to detect a white or black surface. ...
2
votes
2
answers
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How to read temperature from multiple DS18B20 faster?
I am writing an Arduino sketch to read temp data from multiple DS18B20 sensors and then write it to serial. The problem is, as I am connecting more sensors, the delay between my temp data is written ...
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2
answers
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How to connect an L293D and an MPU6050 to run together?
I'm wondering how to connect the L293D (H-bridge) and an MPU 6050.
I'm using 1 Arduino Uno, 2 DC motors, 1 MPU6050 and an L293D.
When I tried this, I got some sparks/smoke from the breadboard and ...
6
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1
answer
1k
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A good water flow meter to monitor home usage with Arduino
I'm searching for a good water flow meter to add to my home controller project with Arduino. I have been searching in several pages and I only found some devices that work for low flow. I need to ...
1
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2
answers
246
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Infrared distance sensor picks up distances that are not there
I have connected an Infrared sensor to my Arduino Uno and I've set this code up to blink whenever a distance of less than 50 cm is picked up. If there is an object less than 50 cm away, it does pick ...
0
votes
1
answer
26
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Printing Serial Readings for 2+ Parallax Ping Sensors
trying print values for two sensors, one works the other is 0, any tips on how i can use more than one?
const int pingPin = 10;
const int pingPinz = 11;
unsigned int duration1, duration2, inches1, ...
0
votes
2
answers
1k
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Read serial data from XV11 sensor
I am trying to read data from an XV-11 sensor using the description of the format found here https://xv11hacking.wikispaces.com/LIDAR+Sensor. This is the code I am currently using to communicate with ...
0
votes
1
answer
131
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Wire over 1ft does not work with sensors SRF02
Im using an SRf02 ultrasonic sensor, and I need to make the wires long to elevate the sensor. They turn on and blink and are able to transmit a signal, yet they are not able to receive a signal. What ...
1
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1
answer
265
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minIMU 9 and Arduino reading Gyro angle
I'm using minIMU-9 https://www.pololu.com/product/1268 and I want to read pitch, roll and yaw angles. I applied this library https://github.com/pololu/minimu-9-ahrs-arduino but there is a slope when ...
2
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2
answers
2k
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Is a HC-SR04 fast enough to make decisions on moving robot (4 Johnson motors 300 rpm)?
I am working on a project in which I have made a robot powered by 4 Johnson DC motors (300 rpm) and controlled by Arduino UNO R3. Now in my project I'd used ultrasonic sensor (HC-SR04) for detecting ...
2
votes
4
answers
1k
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Low power + Logging motion detection
Scenario: I would like to monitor my closet's door as I highly suspect a family member is opening and using my items without permission. To respect privacy and also because my closet is nowhere near a ...
0
votes
1
answer
50
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Erroneous sensor reading while connecting extra load
I'm making a speedometer using arduino. I've made use of the interrupt pins to achieve the same. My problem is with the power source. I'm using a 12 V battery supply to power the arduino and I'm also ...
0
votes
1
answer
1k
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Measuring acceleration in g's
I am using adxl335 accelerometer with Arduino uno r3 to measure acceleration due to gravity along x axis. I am using 50 ms delay and printing to serial.
I have two questions, which are;
Can I ...
2
votes
0
answers
223
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Too many Bytes Using Ultrasonic Sensors
I need to send one transmission and record multiple distances with 4 receivers, but everytime I use more than 2 receivers, the serial data does not print. What can I do?
P.S. I'm using 5 SRF-02 ...
0
votes
1
answer
2k
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How can I connect the MP503 to an Arduino Uno (Smoke, Alcohol Sensor)?
I don't know how I can connect an MP503 sensor to my Arduino.
Please help.
http://eleparts.co.kr/data/design/product_file/SENSOR/gas/MP503%20(Ver1.4)%20-%20Manual.pdf
0
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1
answer
37
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Using 2 PING Senors at Once
I am trying to get values for two ping sensors, but am not getting any returns, can someone help me edit my code?
Code
void setup()
{
Serial.begin(9600);
pingRange(2);
pingRange(3);
}
void ...
2
votes
0
answers
105
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SRF-02 UART, transmitting from one address to another
So I just starting playing around with UART and SoftwareSerial while playing with these SRF-02 Sensors - http://www.robot-electronics.co.uk/htm/srf02techSer.htm
I need help getting one to read to the ...
0
votes
2
answers
1k
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Arduino : distance measurement between fixed points
I am creating a moving robot which needs to know its exact position on the map(known before, start point also known). My ideas were :
GPS : this is not accurate enough for me, does not work indoors
...
1
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1
answer
573
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How can i connect the Mics-5132 to Arduino Uno (Carbon Monoxide Sensor)
hi. i don't know how can i connect Mics-5132 CO Sensor to my arduino.
plz help
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2
answers
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Arduino Mega failure after first use of Mega Shield power connector
I have an XDRduino Mega clone with ATmega2560 and ATmega16U2 USB support chip. I also have a Sensor Shield (same vendor), which provides screw terminals to Vin and Ground.
I connected the board with ...
0
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1
answer
1k
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Algorithm to detect motion using ultrasonic sensor
I have a PIR sensor which sometimes give false readings and I have added a ultrasonic sensor to compensate for that. I think my algorithm can work, however currently it is very prone to give false ...
6
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2
answers
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Why is my TMP35 giving me weird values?
A TMP35/36/37 is giving very high voltage readings, which results in high temperature readings. The serial monitor looks like this:
As you can see, the sensor value is in the 900s, voltage is almost ...
5
votes
6
answers
10k
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Using / calibrating pH sensor module
I've bought this sensor module board to link to an Arduino nano: http://www.ebay.com/itm/For-Arduino-Liquid-PH-Value-Detection-detect-Sensor-Module-Monitoring-Controller/321764233326
I assumed the ...
1
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1
answer
356
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Arduino number detection [closed]
I am planning for a project but i am stuck with a task and hope you could help me. My work is to note down a number which is actually a set of readings displayed on a meter and store it on a arduino. ...
1
vote
4
answers
772
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Create a device to detect object state
Here is what I want to do or get it done (since I am not a embedded guy)...
create a prototype with Arduino to detect open window/door of my room using camera(image processing/object state detection)?...
2
votes
0
answers
115
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Teensy and MS5803 sensor
I'm trying to use the MS5803 pressure sensor with a Teensy 3.2. Compiling the Sparkfun, or other, libraries, however, results in no output.
Can you provide guidance on how to modify the libraries to ...
0
votes
3
answers
813
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TMP36 probe reading 0 on analog
I've designed this system which is supposed to turn on the LEDs when the temperature of a particular probe exceeds 32 degrees. From what I can tell, this should be functional but the analog sensor is ...
5
votes
3
answers
7k
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Humidity values returned by DHT22 sensors failing after some time
I've built a weather station using Arduino that measures temperature/humidity and pressure using an Adafruit 8266 HUZZAH. Temperature and Humidity are measured using a DHT22 sensor a ordered from ...
0
votes
1
answer
290
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Capacitive sensor MPR121 on Arduino Uno—how many will work?
I need to attach several capacitive sensors MPR121 with each of them using all of its 12 electrodes to an Arduino Uno.
Could you please tell me, how many will work with the voltage and current ...
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2
answers
1k
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How do I know which is ground and power in Piezo?
I have a piezoelectric sensor. Both pins are the same length. I have one like this: Piezo picture. On the Piezo it's written muRata and 01P. How do I know which do I send to the digital pins and which ...
0
votes
1
answer
341
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Help with arduino car project
So in computer engineering I've got to make a arduino based car, I've added a whole bunch of features such as IR tracking, obstacle avoidance(proximity sensor), optical tracking(follow a black line), ...
0
votes
1
answer
65
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Ping sensor with three or four pins?
I bought a Ping Ultrasonic Range Finder. It has four pins that you connect to the Arduino. I see in Internet that they have three pins. What does represent each pin and where to connect it to? I have ...
-2
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5
answers
4k
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BH1750 Light sensor always giving output as 54612lx
urgently need some inputs,
Connection:
VCC-5v
GND-GND
SCL-SCL(analog pin 5)
SDA-SDA(analog pin 4)
ADD-NC or GND
Code pasted below
used library from GIT : https://github.com/claws/BH1750
#include &...
1
vote
2
answers
357
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What type of sensor could I use to determine the mass of a small object (under 1 kg)?
I'm building a robot that needs to pick up a piece of material and then determine its mass. My robot will retrieve the material using a scoop at the ended of a mechanized arm. Once the material is in ...
2
votes
2
answers
3k
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Servos and ultrasonic at the same time
So recently I started making a sonar out of ultrasonic HC-SR04 sensor and servo motor. The idea was to slowly rotate servo 180 degrees while measuring distance.
Soon after I noticed that regular ...