Questions tagged [temperature]

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How to keep battery warm/cold enough for it to work in temerature from -15°C to 40°C [closed]

I'm building an IoT project using ESP32 with an almost constant power supply, that can run on a battery in case of power loss. My main concern is the temperature that will vary based on the time of ...
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0answers
94 views

MAX31865 and PT100 readings problem

PT100 (3 wire) is connected to arduino uno as i believe i have them connected properly, i have checked other forums such as changing the capacitor to ferrite core, and probably changing up to 4 ...
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3answers
171 views

Endurance of Arduino UNO during 24/7 operations and mild power fluctuations

I am designing an automation system for my research project and planning on using Arduino Uno to do the same. The program is to execute simple instructions based on few input parameters and does not ...
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1answer
74 views

How to you initialize a reset on a sht30 digital thermometer?

I have a sht30 that will output correct temperature readings for about 5 min and then will drift off. So I'm trying to hit the reset every few seconds to keep the readings accurate. I am on a nano ...
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0answers
35 views

Output from LM35 temperature sensor varies wildly

I've seen other posts on this board which related to output from the LM35 sensor, but mine seem to be more 'extreme' than anything else I've seen. I've connected the pins as is commonly suggested - ...
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2answers
127 views

Using LM70 temperature sensor with Arduino

I am trying to sense the temperature using the LM70 temperature sensor with an Arduino Mega. As you can see in the Datasheet, it uses the SPI protocol. I have made the following connections (VSSOP-8 ...
2
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1answer
56 views

L293D to change the direction current and amplify it - Temperature-Stabilizer

I have a question about my project. I'm going to make a temperature-stabilizer. To make this, I think I should use a TEC with a H-bridge and a LM35. First of all, I tried to make a H-bridge by myself, ...
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1answer
144 views

Problem with if condition

So my project is including detecting the temperature in the room by using dth11 sensor. my idea is to add 3 LED lights were each light represent the temperature if its cold or hot or perfect. the ...
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0answers
46 views

Noob here.. Need help with a thermostat controlled relay

So After trying several sketches for a LM35 and none working I finally found one that was giving me accurate results. The problem is the code is way over my head. I was able to modify it enough to get ...
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2answers
269 views

need to compare if a byte is less than 80 hex

I am using an infrared sensor called OTI301. In its data sheet it says that in order to obtain object temperature and ambient temperature values I need to extract the binary information from the ...
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1answer
77 views

Extract binary numbers from infrared sensor that uses I2C bus

I have an infrared sensor(OTI 301) which in order to display the desired temperature I need to apply a formula that depends on 3 binary numbers extracted from the sensor itself. I have tried different ...
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4answers
1k views

How to heat the air with arduino?

I have a plant growing box, fully controlled with arduino. Youtube: ESP8266 IOT Flora All things are under control, besides the air temperature. I can cool it down running fans, but cannot find a ...
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1answer
418 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
3k 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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2answers
46 views

DHT11 + ESP plus Arduino [closed]

Someone could help me? I want to use dht11 with arduino and esp. Both will read data from dht11 the problem is that simultaneously cannot be done. So the solution will be to set one as a master and ...
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2answers
1k views

my LM35 temperature sensor gives weird measurements,

Board: esp32 I know my wiring is correct because I get data from the sensor, but the data is a bit weird. At 22 celcius I get 140, even though if I do the voltage calculation (* 0.473372) it still ...
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1answer
163 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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2answers
134 views

RC-oscillator calibration in real time

This pesky watchdog RC oscillator is at the limit of its 10% tolerance already at room temperature. i was looking to bringing it to more like 5% (it stems from an internak 128 kHz RC oscillator) and ...
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1answer
1k views

Nan values in Egg Incubator

I've recently built my Arduino Incubator, which consists of a DHT22 sensor, an LCD Keypad Shield, some fans, resistors, e.t.c. I uploaded the sketch, and everything seemed fine. However, when I try ...
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1answer
132 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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2answers
2k views

7 segment display blinking

I want to display the DHT22 temperature and humidity sensor in a 3 digit 7 segments display. It's always showing the sensor value and after 2 or 3 sec the display turns off, and then the display ...
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0answers
200 views

Arduino shuts off randomly (Temperature?)

I've got an Arduino Uno running in a case, with a Fona 808 shield from Adafruit on top. It's used as a location tracker; it'll get the current GPS location three times a second, then send the average ...
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1answer
889 views

LMT 84 temperature sensor measurement error

I want to measure atomospheric temperature with arduino sensor i am using is LMT84. data sheet :http://www.ti.com/lit/ds/symlink/lmt84.pdf After uploading following code to arduino board i am ...
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1answer
677 views

I keep getting an error message and I don't know how to fix it

I am using an Arduino Genuino, this is what comes up Multiple libraries were found for "LiquidCrystal.h" Used: /home/user/Arduino/libraries/LiquidCrystal Not used: /opt/ArduinoIDE/libraries/...
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1answer
851 views

Temperature control using a DHT11

I am trying to do a project on temperature control and found an example but cannot get the code to work. I have read forums and tried to fix the issue which is below the code. Code: #include<DHT....
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7answers
5k 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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2answers
325 views

Merging arduino code

I have a project where we need to create a virtual cane for blind people and it will have 3 functions: Pressure button when pressed will connect to an android phone through HC-06 Bluetooth modulo to ...
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2answers
848 views

2 sensors, add delay between each reading

I have two temperature sensors, an MCP9808 and a DS18B20, connected to an arduino and I've read that it could be advantageous to set a small delay between temperature readings. What I wonder is where ...
2
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0answers
60 views

Different behavior when Arduino Micro powered by laptop USB vs portable charger USB

I'm working on a project that uses an LM35 temperature sensor to control a few LEDs. Above 97 degrees, one LED should switch on. Below 95 degrees, it should switch off and the other should switch on. ...
2
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1answer
77 views

Lifespan of a hot microchip [closed]

I'm currently building my own Home Automation System with a bunch of Arduinos and Relais, all of them wired to Ethernet "Shields". The casing I am printing on a 3D printer. The Arduinos work great ...
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2answers
3k views

High Precision Temperature Sensor LMT70 connection to arduino mega

How can I connect an LMT70 temperature sensor (4Pins) to Arduino Mega board for atmospheric temperature measurement. LM35 sensor has got only 3 pins and connections are known. But LMT70 high precision ...