1-WIRE DS18B20 TEMPERATURE SENSOR - Arduino tutorial #6
ฝัง
- เผยแพร่เมื่อ 12 มิ.ย. 2024
- In this Arduino for beginners tutorial I'll teach you how to read the DS18B20 1-wire temperature sensor.
The Arduino for beginners tutorials series guides you through the world of Arduino. A video is around 10 minutes and shows you step-by-step how to build the circuit and write the code. The website contains the course material, circuit diagram, Arduino code and shopping list of all the components used in the tutorial.
⬇️ Arduino code, circuit diagram and part list arduino-tutorials.net/tutoria...
👉 More tutorials and projects on arduino-tutorials.net
🇳🇱 Deze tutorial is ook in het Nederlands beschikbaar • 🇳🇱 SCHAKEL LED OP TEMP...
CHAPTERS:
00:00 Introduction
00:08 Requirements
00:37 1-wire sensors
02:39 Building the circuit
03:45 Arduino code
08:54 Coding challenge
COMPONENTS
🇨🇳 Arduino Uno (clone) with cable - AliExpress
arduino-tutorials.net/r/Jd28hF
🇳🇱 Arduino Uno (clone) - Opencircuit
arduino-tutorials.net/r/8237Hd
🇳🇱 Arduino Uno SMD (original) - Opencircuit
arduino-tutorials.net/r/Ud29dh
🇳🇱 Arduino Uno Chip (original) - Opencircuit
arduino-tutorials.net/r/Jd82ha
🇨🇳 1x breadboard small - AliExpress
arduino-tutorials.net/r/7364GD
🇳🇱 1x breadboard small - Opencircuit
arduino-tutorials.net/r/238Jds
🇨🇳 1x breadboard large - AliExpress
arduino-tutorials.net/r/FDH28dh
🇳🇱 1x breadboard large - Opencircuit
arduino-tutorials.net/r/8237Dh
🇨🇳 300x Resistors - AliExpress
arduino-tutorials.net/r/Hd72hf
🇳🇱 600x Resistors - Opencircuit
arduino-tutorials.net/r/Ahd72g
🇨🇳 Jumper wire assortment (MM/MF/FF) - AliExpress
arduino-tutorials.net/r/Fh378fg
🇨🇳 Jumper wire male-male - AliExpress
arduino-tutorials.net/r/7346GD
🇳🇱 Jumper wire male-male - Opencircuit
arduino-tutorials.net/r/8237Jd
🇨🇳 5x 1-wire DS18B20 temperature sensor - AliExpress
arduino-tutorials.net/r/348fhD
🇨🇳 1-wire DS18B20 water proof temp. sensor - AliExpress
arduino-tutorials.net/r/s5Rmi8
🇳🇱 1-wire DS18B20 temperature sensor - Opencircuit
arduino-tutorials.net/r/82Hdgf
🇳🇱 1-wire DS18B20 water proof temp. sensor - Opencircuit
arduino-tutorials.net/r/374Hdg
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Nice
Had 3 of these (pigtail type) wired up to an ESP32 NodeMCU. One would randomly read between real and 185F. Good thing Amazon sold them in 5 packs. Replaced the flaky one and so far all is well.
I had the same thing once, guess I connected for example the GND and 5V the wrong way around and shorted the circuit. Lucky these sensors are not expensive :)
I just did your tutorial, thank you. I will do more of yours now :) One question, would this be possible also if I used a TMP36 sensor?
Okay I answered my own question. I tried the TMP36 sensor but it did not work, all I got was the -187 reading and the TMP36 got very hot very fast, so I had to take it out before I damaged it.
I also tried using the DS18B20 with the cable and sensor www.aliexpress.com/item/4000143479592.html but it did not work, I also got the -127 in the serial monitor. What would be the reason for this? They both have the same number.
The TMP36 sensor is not a 1-wire sensor, so you can not just replace the two with each other
At around 6:30, on line 31, what is the 'delay(1000)' code meant to do?
(I ask because the code seems to execute the same even without it in the code block.)
delay() pauses the processor for the specified amount of milliseconds. So in this case it stops the program for 1000ms = 1 second
Thanks for sharing. This was very helpful. I had a few questions.
1. If you have multiple sensors connected on the same pin, how do you determine which sensor is assigned which number?
2. When you initiate the instance as 'oneWire' for onewire and 'sensors' for dallastemperature, do you have to use those terms (oneWire and sensors) or can they be anything?
1. Each 1-wire sensor has its own address. So first you can use a script to list the 1-wire address of the sensor. This code should be in de example code of the Arduino IDE
2. Variables can be any name you want. Library names can't
@@BasonTech I understand. Thanks for the prompt reply.
My pleasure! 😃
My sensor is reading 197 C , how can I calibrate it? I'm usingthe same sensor in arduino too, but for ESP32
You can't really "calibrate" it other than subtracting a number of the measured value. Make sure you have a DS18B20 sensor and setup the wires and code correctly. The sensor should be quite accurate.
At 4:51, on line 12, why are we using the '&' inside the brackets?
What does the '&' do?
See 4:45 it is the memory address of the variable instead of its value
Hi Bas :-)
When you assign pin 12 as the T input, why do you write:
'int oneWireBus = 12', from outside the setup() function
instead of the usual 'pinMode(12, INPUT)', from inside the setup() function?
that is because the oneWireBus constant is directly used one line below, and not in the setup. We are not using it as an input, it is used by the OneWire library
@@BasonTech Thanks
On line 17, at 5:03, why must we make sure the LED is off when the program starts?
What happens if we don't? (I just executed without that code and it didn't make a difference - on this project.)
Is this a good convention which is helpful in some instances? And if so, in which instances?
(Enjoying your tutorials.)
You want to create a "known state" when your program starts. Now further in the program we "know" that the LED is off instead of assuming. This can avoid bugs or side effects later in your program.
If I am not using 4.7kohm resistor, am I not going to get the desired output? as I keep getting -127
Correct, it is needed by 1-wire for the data bus
without setting input pin 12, how it takes reading?, i am getting -127 as output..
Are you really sure you are using a 1-wire temperature sensor? Many use another one which kinda looks the same 😃
I have another question. How did you get the value of which resistor to use, why a 4.7K resistor?
Hi Bob, good question. It works as pull-up for 1-wire. More info in this topic: arduino.stackexchange.com/questions/30822/the-use-of-4-7kohm-resistor-with-ds18b20-temperature-sensor
@@BasonTech Cheers that helps.
It would be so awesome if you could include the Alarm functions of this sensor. I'm utilizing my DS18B20 to monitor the green house I have. If the temp rises above the set threshold, arduino uno digitalwrite Pin high. thus turning on a relay which drives an actuator that opens an air vent. the other relay starts the vent fan. the lower threshold would initiate my heat source.
What have you tried so far, and on what part are you stuck?
@@BasonTech I followed all of code in this video. And added the alarm low and high that you showed. My initial attempt failed. I’m not at my computer right now. But later today I’ll try again and I’ll try to include code in an email if your comfortable sharing an email address with me.
@@BasonTech thank you for your fast response!.. I’ll repay you by watching all of your videos over and over!
There is a contact option at arduino-tutorials.net 😃
I've done your tutorial, however the problem tthat I am experiencing is that the temperature does not update. It only updates to the new temperature after I reset the board. Any idea what could be causing this
Hi William, could it be that you have written the code in the setup(), which only runs one time instead of the loop() which is infinitely ran?
@@BasonTech no, the code is in loop. I figured out what the issue is. The Serial monitor is not updating the temperature after the first reading. I have to refresh the serial monitor to get the updated temp. Any idea what could be causing that?
I have experienced such a thing once. The reason was that the serial.setup() was in the loop instead of the setup()
At void loop(void) and void setup(void), why is 'void' inside the brackets?
P.S. Thanks for a helpful channel.
Because there are no arguments given to the setup and loop function we set it as void. You can leave them out if you want as shown at reference.arduino.cc/reference/en/language/variables/data-types/void/ 😃
Hello. I followed the tutorial exactly however I keep getting a temperature reading of -127. Does anyone have an idea about this issue ?
Are you 100% sure you have a DS18B20? There are other components which look the same but are not the DS18B20 but for example a transistor.
@@BasonTech Yeah I am sure it's the DS18B20
Then it must be the Arduino, wiring, code, or faulty sensor. Hard to say which one without having the circuit in my hand.
@@BasonTech Thank you for your reply.
please can you help be i have TEMPERATURE SENSOR :dallas_DS1820_1324C4_+964AB it give me Temperature is: -127.00 value
Are you very sure you are using the 1-wire SD18B20 sensor? Sometimes people use for example a diode because it looks the same.
@@BasonTech oui thanks for the fast response I am very sure I think I have a problem in my sensor I need to change it. Do you know how to verify if my temperature sensor work or not?,
You can with my code, or by grabbing 1-wire code from the examples in the Arduino IDE and see if the sensor gets detected.
we did the same procedures but we always get - 127, we checked everything but we still couldn't figure out what is wrong
Most people have this issue because they are not using a DS18B20 temp. sensor but for example a diode which looks the same but is a complete different component. Are you absolutely sure you have a 1-wire DS18B20?
@@BasonTech we bought our sensor in a local but trusted shop, i don't think that's the case /but it could be
is the small black thing also called LM35? we bought ds18b20 and LM35 but they are not in the same kit
LM35 is a temperature sensor, but not a 1-wire one. Make very sure that the sensor has DS18B20 printed on it
Last lesson we used a 'pull down resistor'.
But in this lesson we're using a 'pull up resistor'.
What's the difference?
A pull-up resistor is used to ensure a HIGH level at the input of a digital circuit when no other device is driving the input. A pull-down resistor is used to ensure a LOW level at the input when no other device is driving the input.
@@BasonTech Bedankt.
Put differently, could we also say that:
A pull-up resistor always intercepts the connections between the Output and Input 'ends' of a component (e.g. the T sensor in this tutorial)?
And that a pull-down resistor always intercepts the connections between the Output and Ground 'ends' of a component (e.g the push button terminals in Tutorial #5)?
I was buying 5 BJTs and they sent one of those to me by accident 🤣
lol 😄 Always nice to get free new components!
@@BasonTech how much do these DS18B20 cost?
In the description of each video you'll find links to all the components 😃
ty
Every time Give me Temperature is: -127.00 value
Hi, are you 100% sure you have the DS18B20 temperature sensor?
@@BasonTech YES .
Then it might be the wiring or the code. If you download the code you could be sure it should work. Maybe double check your pins and wiring 😃
@@BasonTech Now its work. Thank You for fast response
Super! What was the issue?