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Questions tagged [temperature]

33 questions
7
votes
7 answers

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 some 5 °C up or down. I had used several posts how…
Rao
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3
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3 answers

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 need large computational powers. It is estimated…
Electro_Boomer
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2
votes
1 answer

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, I have only used four NPN transistors and It…
GKO
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2
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2 answers

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 an app that I developed and will can to someone…
Josh Miles
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2
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0 answers

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. In between those temperatures, the LED state…
pyfi12
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2
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1 answer

Lifespan of a hot microchip

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 with those Ethernet "Shields", but the ENC28J60 chip…
Fusseldieb
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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 breakout boards to get the same result (getting crazy).…
Lactobacillus
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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 - left hand to 5v, middle A0, and right to GRN and…
Andy_Smart
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vote
2 answers

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 Package): SI/O pin --> Pin 50 Arduino Mega. SC…
Fakiko
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1
vote
1 answer

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 wiring and coding is done and it's working .However,…
Faisal
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0 answers

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 the serial and temperature to a LCD but I cant…
Dnozz
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1
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2 answers

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 sensor and use the binary information in given…
Santiago Restrepo Serna
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1 answer

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 the output is: output RTD value: 0 Ratio =…
java bee
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2 answers

DHT11 + ESP plus Arduino

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 the other one as a slave. the control will be done…
Iulian Chirvasa
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1
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1 answer

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 to select the temperature and humidity I want, it…
Lefteris Garyfalakis
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