Questions tagged [temperature-sensor]

A component which measures heat.

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29 views

If-Condition sensor

Can someone help. I need to do, that when sensor is covered for 350ms (Sensor 1)is LOW and if sensor less covered than 350ms ( Sensor 1) HIGH, and when (Sensor 2) HIGH active pin 5 output. Becouse ...
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23 views

connected collar with GPS, temperature and heart rate sensors + microphone

I am taking part in a project as part of a challenge and I'm in charge of the embedded systems part, this is my first time working on a project of this scale. I am looking for a way to wirelessly send ...
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1answer
18 views

How to change the resolution of DS18B20?

I'm using DS18B20 sensor with this library, the 750ms delay is causing problem in timer part of my code. the code below is from DallasTemperature.cpp: // returns number of milliseconds to wait till ...
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2answers
35 views

Is DS18B20 temperature sensor makes Arduino processing slow?

I recently run into a problem that causing my whole code processing slow down, for example i had a millis timer set for one minute but it took 1:30m to finish, pressing buttons was laggy etc. After ...
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1answer
41 views

Multiple dht11 on an wemos d1 r1

I am trying to connect three separate DHT11 to my Wemos d1 r1. I have each sensor hooked to a power pin which turns on and off, the sensor pin and a common ground. Here is my code: #include <...
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1answer
81 views

PT100 and MAX31865 readings showing wrong

I am using PT100 (3 Wire) to measure the temperature with Arduino Uno and MAX31865. I have connected everything perfectly. Configuration in the code i am using is : max1.begin(MAX31865_3WIRE); And ...
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5answers
2k views

Fluctuating readings of LM35 temperature sensor (+- 5°C) with Arduino UNO

I am trying to read a LM35 temperature sensor with Arduino UNO which I got as a gift. The issue is the fact, that my readings of sensor are, well, suspicious at least - they jump with each reading ...
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1answer
66 views

Please help me combine the two codes for DHT11 and SW-420 Vibration sensor for arduino in one program [duplicate]

The following is the code used for DHT11 Temperature and Humidity sensor: #include <LiquidCrystal.h> LiquidCrystal lcd(4, 5, 0, 1, 2, 3); byte degree_symbol[8] = { ...
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1answer
52 views

Measure 64 different Thermocouples fast

I used the MAX31850K for testing. Its too slow (100ms resulting in around 7 s to wait till i know the temperature of all). I want to be able to measure them all within 1 sec. Should I try build my ...
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1answer
89 views

Arduino based fully controlled aquaculture

I am doing a project on aquaculture,so I am using temperature sensor, water level sensor, dissolved oxygen sensor, pH sensor and also 4 motor's and water heater is it possible for a single Arduino to ...
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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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0answers
46 views

Converting Client input char to int

I'm trying to print out the temperature from a DS18B20 sensor to my app via a tpc connection. Because I have two sensors connected I will need to call the one needed by an Index. This index comes from ...
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2answers
1k views

Arduino freezing with OLED display

I have a 0.96" OLED display hooked up to my Arduino Mega via SPI. I installed the Adafruit library and GFX library. I can run through the little graphical demo from Adafruit just fine as well as ...
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1answer
1k views

MQ135 Air Quality Sensor Signal Amplifier needed? Higher Quality Sensor?

I am trying to strengthen the signal from my MQ135 air quality sensor so it can detect aerosols from 3 feet away, as, currently as it stands the resolution is pathetic, it only blips from 0.21 to 0.58 ...
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1answer
898 views

Arduino MKR1000 and DHT11 not giving correct output for temperature and humidity

I've been trying to follow this tutorial to wire my Arduino MKR1000 to a DHT11 temperature and humidity sensor, but my output consists of either 0's or 255's for both values. I've tried several ...
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1answer
686 views

Using Modbus-RTU with Arduino and temperature controller

I'm trying to connect with a 4 channel temperature controller using Arduino Modbus Library. This is a part of my temperature controller datasheet. It has register for read PV of each channel. I have ...
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2answers
8k views

Problem with a DHT11 Temperature & Humidity sensor

I'm new in the Arduino world and today i was trying to make a simple program to show the temparature an humidity with this sensor. I made a circuit following one tutorial and nothing happend, the ...
2
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1answer
220 views

Combine DHT22 and SI114X.h

It looks like I cannot combine the Grove sunlight sensor and the Grove DHT22 temperature and humidity sensor. I can't figure out why. I have the following setup: Seeeduino Cloud (Arduino Yún clone) ...
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1answer
513 views

GPS module not working with sensor

I am connecting my Soil Moisture Temperature Sensor SHT10 with GSM Module SIM900A and GPS GY-GPS6MV2. Individually, all components work properly and give proper values. But when I interface all three ...
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1answer
17 views

Need help combining two sketches (HC05 and temperature)

I have a project where I have to combine 4 sensors and get data wireless via Bluetooth (HC05). I just want help with combining just 1 sensor sketch and the Bluetooth sketch. I want the data from the ...
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2answers
47 views

Interrupt triggering using DHT-11

I am new at arduino. I want to write a sketch that would print the message if the temperature grows greater than 30 C. Here is my sketch can you please tell me what's wrong with it #include "DHT.h" #...
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43 views

Arduino stuck when I disable Timer 2 Interrupt

#define TIM2_EN() (TIMSK2 = 0x02) #define TIM2_DIS() (TIMSK2 = 0x00) //HEART SENSOR // Include Libraries #include "Arduino.h" class PulseSensor { public: static void begin(int pulsePin); static ...
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0answers
58 views

What is the difference between the digital temperature sensors SHT31 and DHT11 or DHT12?

I am looking for a digital temperature sensor with I2C interface. I found the SHT31 and the DHT12 (compatible to DHT11). Both also include humidity sensors. And I found libraries for both of them. ...
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1answer
35 views

Use 2 DHT22 AND PASS THE DATA TO SD Error File data does not exsist

anyone can help me please to fix this error when I try to compilate says File does not exsist. It would be great if anyone can post the entirely code. Link of code below if anyone can help me please: ...
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0answers
151 views

Arduino Uno - temperature sensor DS18B20 not responding

I try to use a new DS18B20+ temperature sensor (sealed water proof version). It doesn't work. My own code doesn't work, examples from DallasTemperature Library don't work, example from OneWire ...
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0answers
48 views

EEPROM.read data not comparing with DHT11 sensor value - Arduino temp controller

I'm using a DHT11 to read temperature to control a relay that will control a fan. When 'A' is pressed it allows the user to update the temp value that the relay will go HIGH at. The value is being ...
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1answer
33 views

Interpreting pull-up values Rp and Rpu in AM3202 (DHT22) datasheet [closed]

In the AM2302 datasheet at page 3, table 4, it gives min, typ and max values for Rpu (that the pull-up resistor as it says verbatim) being 30K, 45K and 60K ohm respectively. Elsewhere in the same ...
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1answer
68 views

DHT 11 temp. And hum. Sensor always 0 values

I am trying to get my DHT 11 from the official arduino store to work (https://store.arduino.cc/grove-temperature-humidity-sensor). I am following this guide right here: http://wiki.seeedstudio.com/...
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2answers
8k views

How to choose between AM230x and DHT22 temperature and humidity sensors?

I'm looking forward to getting an accurate humidity and temperature sensor. Right when I decided to go with a DHT22 module, I saw AM230x (AM2301, for example). How do I choose between DHT22 and ...
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0answers
42 views

Can I put a resistor in the ground connection of my DHT22 sensor?

I'm building a project that uses a couple of Adafruit DTH22 temp/humidity sensors. (https://www.adafruit.com/product/385) I have them wired into my project box through 3.5mm mini plugs (The kind that ...
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1answer
6k views

DHT11 data in Arduino UNO to Firebase through ESP8266

Hello Good Day to Everyone. I have a project where I need to send DHT11 sensor data to a Firebase database using both Arduino UNO and Esp8266 esp-01 wifi module. Both of them must work together to ...
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2answers
260 views

Combining code for multiple sensors in a single program [closed]

I need to operate 3 different sensors (taken 6 sensors of each type) by Arduino Mega2560 :- DHT11 (temperature-Humidity sensor) MQ5 (gas sensor) and Soil Moisture sensor {taken 6 of each type (total=...
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1answer
5k views

How to make MEMS IR Thermal Sensor - D6T-44-L06 work with Arduino?

I am working on project that my team need to detect the presence of the people. At first, we tried with motion sensor but it wasn't the way that we want it to work. We want to detect presence of the ...
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1answer
90 views

Looking for a waterproof SPI temperature sensor

In my current project I'm using a DS18B20, which seems to be the only temperature sensor to show up when googling for waterproof temperature sensor for an arduino. The sensor itself is fine, however, ...
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2answers
7k views

Problems with I2C connection on ESP8266 - 12F, which pins should I use?

Previously I had pined the temp/hum sensor HDC1080 with an Arduino using this sketch and everything worked fine. Now I want to run it over an ESP-12F, I uploaded it but it has issues at the time of ...
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2answers
274 views

Trouble reading LM35 with long (?) Ethernet connection

I have a quick question to ask. I have an Arduino Uno reading 4 temperature sensors (LM35) in 4 different rooms. What happens is that the two nearest rooms give stable values, while the two further ...
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1answer
53 views

Error:expected declaration before { token. (Havent i already declared it?) [closed]

I'm getting the error message: sketch_dec31d.ino: In function 'void setup()': sketch_dec31d:20: error: expected unqualified-id before '.' token sketch_dec31d.ino: In function 'void loop()': ...
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1answer
24 views

I keep gettint the error expected construcotr,destructor or type conversion before = token [closed]

#include <dht.h> dht DHT; #define DHT11_PIN 2 // what pin we're connected to // DHT 11 String TextForSms ; String humidity = " Humidity: %"; String temperature = " Temperature"; String ...
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0answers
78 views

LCD (I2C) issues with pull up resistor

I'm close to finish my first DYI project. But a never seen issue on the breadboard has apprear as soon as assembled. The LCD is always / totally blank/black. When I remove the 4.7 K ohm pull-up ...
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1answer
198 views

Data loging while browsing a menu on LCD shield

I'm new in arduino and not particularly awaken when it comes to code ;) . I'm developing a device SD logging Temperatures from 2 thermocouple . Hardware works well and I'm now trying to refine use of ...
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1answer
173 views

MKR1000 and DS18B20 temperature sensor

I am new to Arduino and electronics in general and I can't get my MKR1000 to read correct data from a DS18B20 temperature sensor. Here is the tutorial I followed. The issue is: I always get the same ...
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1answer
70 views

Learn Arduino Basics : Temperature sensor with LCD Display and Potentiometer setup [closed]

I have temperature sensor, potentiometer and LCD screen attached to mini breadboard and wired to an Arduino. My temp sensor appears to be working fine however sometimes it reads inaccurate numbers ...
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1answer
292 views

DHT22 need pull down/up ESP8266

I have the strange pb. My esp8266 was working fine with my DHT22 and then failed every time. I loaded an example sketch in a other ESP8266 and I have the same pb.... until I shut down -> up the DHT22 ...
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2answers
433 views

How to Connect ESP8266 with ultrasonic sensor and dht11 without breadboard? [duplicate]

I want to connect the sensors in Esp8266 after I code those using arduino uno r3. The problem is that I don't have the idea on connecting those sensors without breadboard. Thank you
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1answer
295 views

how to increase the delay factor of DHT11?

There is no compiler error but output is showing timeout error. as per as the instruction given in https://github.com/RobTillaart/Arduino/issues/61 it says to increase the timeout factor but i did ...
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1answer
149 views

Frequent ON OFF in SSR

I am working on a project on Arduino OLED MAX6675 thermocouple and SSR for my oven. My problem is when my SSR goes in LOW or HIGH state it turn ON and OFF several times before going to permanent HIGH ...
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1answer
166 views

How do I select Sensor using chip 74HC138 on Wemos D1 Mini?

I have a project for my graduate degree. It's about Monitoring Temperature and Humidity using Message Queuing Telemetry Transport on Serial NodeJS. To get sensor data to Wemos D1 Mini and NodeJS had ...
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2answers
28 views

Ping a sensor for error checking

Is it possible to ping a sensor, like DHT22 or 18B20, to check for connection. I want to do an error check in void setup() and make sure all sensors are connected properly.
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3answers
2k views

Help using thermistor with esp8266

So I am trying to use this thermistor to measure temperature and with this code below it always puts the same value (2147483647). I used this tutorial to do the wiring and coding. I don't think the ...