![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/10\/ESP32-ESP8266-MicroPython-DS18B20-Temperature-Web-Server.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nIf you want to learn how a relay module works, read our MicroPython Guide: DS18B20 with ESP32 and ESP8266 (Temperature Readings)<\/a>.<\/p>\n\n\n\n We have similar guides using Arduino IDE:<\/p>\n\n\n\n To follow this tutorial you need MicroPython firmware installed in your ESP32 or ESP8266 boards. You also need an IDE to write and upload the code to your board. We suggest using Thonny IDE or uPyCraft IDE:<\/p>\n\n\n\n Learn more about MicroPython: MicroPython Programming with ESP32 and ESP8266 eBook<\/a>.<\/p>\n\n\n\n The DS18B20 temperature sensor<\/a> is a one-wire digital temperature sensor. This means that it just requires one data line (and GND) to communicate with your ESP32 or ESP8266.<\/p>\n\n\n\n It can be powered by an external power supply or it can derive power from the data line (called “parasite mode”), which eliminates the need for an external power supply.<\/p>\n\n\n\n To follow this tutorial you need the following parts:<\/p>\n\n\n\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> If you’re using an ESP32, follow the next diagram.<\/p>\n\n\n\n If you’re using an ESP8266, follow the next schematic diagram.<\/p>\n\n\n\n Note: <\/strong> in this tutorial we’re connecting the DS18B20 data line to GPIO 4, but you can use any other suitable GPIO.<\/p>\n\n\n\n For this example, you need two files:<\/p>\n\n\n\n Note: <\/strong>it is a good practice to include the boot.py<\/em> and main.py<\/em> files. However, if you prefer, you can include all the code in the main.py<\/em> file.<\/p>\n\n\n\n Create a new file in your IDE called boot.py<\/em> and copy the following code. View raw code<\/a><\/p>\n\n\n\n This file imports the required libraries, sets up the DS18B20 sensor and connects to your network.<\/p>\n\n\n\n Here, we’re setting the DS18B20 data pin on GPIO 4<\/span> but you can use any other suitable pin:<\/p>\n\n\n\n You should insert your network credentials in the following variables so that the ESP is able to connect to your network.<\/p>\n\n\n\n In the main.py<\/em> file is where we\u2019ll create the web server and handle the requests. Copy the following code to your main.py<\/em> file. <\/p>\n\n\n View raw code<\/a><\/p>\n\n\n\n The code starts by creating a function called read_ds_sensor()<\/span> that gets the temperature from the DS18B20 temperature sensor. If you’ve followed the previous section, you should be familiar with the methods used here.<\/p>\n\n\n\n The web_page()<\/span> function returns the HTML page with the latest temperature readings.<\/p>\n\n\n\n We’ve built a similar web page on a previous tutorial. So, if you want to learn how the HTML works, you can read this article: MicroPython: ESP32\/ESP8266 with DHT11\/DHT22 Web Server<\/a>.<\/p>\n\n\n\n After that, make the usual procedures to create a socket server.<\/p>\n\n\n\n For an in-depth explanation of this procedure, refer to this tutorial<\/a>. <\/p>\n\n\n\n Basically, when the ESP receives a request, we send the web page with the latest readings as a response:<\/p>\n\n\n\n After uploading the boot.py<\/em> and main.py<\/em> files to your board. Click the ESP RST button to run the code.<\/p>\n\n\n\n Then, open your browser and type the ESP IP address. You can access the web page with the latest sensor readings in Celsius and Fahrenheit degrees: <\/p>\n\n\n\n We hope you’ve found this MicroPython guide about the DS18B20 temperature sensor with the ESP32 and ESP8266 useful. We have other projects with the ESP and MicroPython that you may like:<\/p>\n\n\n\n Learn more about MicroPython with ESP32 and ESP8266 with our eBook: MicroPython Programming with ESP32 and ESP8266<\/strong><\/a><\/p>\n\n\n\n Thanks for reading.<\/p>\n","protected":false},"excerpt":{"rendered":" This tutorial is a step-by-step guide that covers how to build a standalone ESP32 or ESP8266 NodeMCU Web Server that displays DS18B20 sensor readings using MicroPython firmware. We\u2019ll create an … <\/p>\nPrerequisites<\/h2>\n\n\n\n
Introducing DS18B20 Temperature Sensor<\/h2>\n\n\n\n
![\"DS18B20](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/07\/DS18B20-tempeature-sensor-pinout.jpg?resize=750%2C490&quality=100&strip=all&ssl=1\")
<\/figure>\n\n\n\nParts Required<\/h2>\n\n\n\n
![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nSchematic – ESP32<\/h2>\n\n\n\n
![\"DS18B20](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/06\/ds18b20_esp32_single_normal.png?resize=563%2C612&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nSchematic – ESP8266<\/h2>\n\n\n\n
![\"DS18B20](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/06\/ds18b20_esp8266_single_normal_F.png?resize=419%2C572&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nCode Web Server – DS18B20 Temperature Readings<\/h2>\n\n\n\n
![\"Display](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/07\/ESP32-ESP8266-DS18B20-Temperature-Sensor-MicroPython-Web-Server.jpg?resize=750%2C420&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nboot.py (DS18B20 web server)<\/h3>\n\n\n\n
<\/p>\n\n\n# Complete project details at https:\/\/RandomNerdTutorials.com\n\ntry:\n import usocket as socket\nexcept:\n import socket\n \nfrom time import sleep\nfrom machine import Pin\nimport onewire, ds18x20\n\nimport network\n\nimport esp\nesp.osdebug(None)\n\nimport gc\ngc.collect()\n\nds_pin = Pin(4)\nds_sensor = ds18x20.DS18X20(onewire.OneWire(ds_pin))\n\nssid = 'REPLACE_WITH_YOUR_SSID'\npassword = 'REPLACE_WITH_YOUR_PASSWORD'\n\nstation = network.WLAN(network.STA_IF)\n\nstation.active(True)\nstation.connect(ssid, password)\n\nwhile station.isconnected() == False:\n pass\n\nprint('Connection successful')\nprint(station.ifconfig())\n<\/code><\/pre>\n\tds_pin = Pin(4)\nds_sensor = ds18x20.DS18X20(onewire.OneWire(ds_pin))<\/code><\/pre>\n\n\n\nssid = 'REPLACE_WITH_YOUR_SSID'\npassword = 'REPLACE_WITH_YOUR_PASSWORD'<\/code><\/pre>\n\n\n\nmain.py (DS18B20 web server) <\/h3>\n\n\n\n
# Complete project details at https:\/\/RandomNerdTutorials.com\n\ndef read_ds_sensor():\n roms = ds_sensor.scan()\n print('Found DS devices: ', roms)\n print('Temperatures: ')\n ds_sensor.convert_temp()\n for rom in roms:\n temp = ds_sensor.read_temp(rom)\n if isinstance(temp, float):\n msg = round(temp, 2)\n print(temp, end=' ')\n print('Valid temperature')\n return msg\n return b'0.0'\n \ndef web_page():\n temp = read_ds_sensor()\n html = """<!DOCTYPE HTML><html><head>\n <meta name="viewport" content="width=device-width, initial-scale=1">\n <link rel="stylesheet" href="https:\/\/use.fontawesome.com\/releases\/v5.7.2\/css\/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">\n <style> html { font-family: Arial; display: inline-block; margin: 0px auto; text-align: center; }\n h2 { font-size: 3.0rem; } p { font-size: 3.0rem; } .units { font-size: 1.2rem; } \n .ds-labels{ font-size: 1.5rem; vertical-align:middle; padding-bottom: 15px; }\n <\/style><\/head><body><h2>ESP with DS18B20<\/h2>\n <p><i class="fas fa-thermometer-half" style="color:#059e8a;"><\/i> \n <span class="ds-labels">Temperature<\/span>\n <span id="temperature">""" + str(temp) + """<\/span>\n <sup class="units">°C<\/sup>\n <\/p>\n <p><i class="fas fa-thermometer-half" style="color:#059e8a;"><\/i> \n <span class="ds-labels">Temperature<\/span>\n <span id="temperature">""" + str(round(temp * (9\/5) + 32.0, 2)) + """<\/span>\n <sup class="units">°F<\/sup>\n <\/p><\/body><\/html>"""\n return html\n\ns = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\ns.bind(('', 80))\ns.listen(5)\n\nwhile True:\n try:\n if gc.mem_free() < 102000:\n gc.collect()\n conn, addr = s.accept()\n conn.settimeout(3.0)\n print('Got a connection from %s' % str(addr))\n request = conn.recv(1024)\n conn.settimeout(None)\n request = str(request)\n print('Content = %s' % request)\n response = web_page()\n conn.send('HTTP\/1.1 200 OK\\n')\n conn.send('Content-Type: text\/html\\n')\n conn.send('Connection: close\\n\\n')\n conn.sendall(response)\n conn.close()\n except OSError as e:\n conn.close()\n print('Connection closed')\n<\/code><\/pre>\n\tReading the DS18B20 Sensor<\/h4>\n\n\n\n
def read_ds_sensor():\n roms = ds_sensor.scan()\n print('Found DS devices: ', roms)\n ds_sensor.convert_temp()\n for rom in roms:\n temp = ds_sensor.read_temp(rom)\n if isinstance(temp, float):\n temp = round(temp, 2)\n print('Valid temperature')\n return temp\n return '0'<\/code><\/pre>\n\n\n\nWeb Page<\/h4>\n\n\n\n
Creating the web server<\/h4>\n\n\n\n
while True:\n try:\n if gc.mem_free() < 102000:\n gc.collect()\n conn, addr = s.accept()\n conn.settimeout(3.0)\n print('Got a connection from %s' % str(addr))\n request = conn.recv(1024)\n conn.settimeout(None)\n request = str(request)\n print('Content = %s' % request)\n response = web_page()\n conn.send('HTTP\/1.1 200 OK\\n')\n conn.send('Content-Type: text\/html\\n')\n conn.send('Connection: close\\n\\n')\n conn.sendall(response)\n conn.close()\n except OSError as e:\n conn.close()\n print('Connection closed')<\/code><\/pre>\n\n\n\nresponse = web_page()\nconn.send('HTTP\/1.1 200 OK\\n')\nconn.send('Content-Type: text\/html\\n')\nconn.send('Connection: close\\n\\n')\nconn.sendall(response)<\/code><\/pre>\n\n\n\nWeb Server Demonstration<\/h2>\n\n\n\n
![\"DS18B20](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2019\/07\/DS18B20-Web-Server.png?resize=687%2C461&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nWrapping Up<\/h2>\n\n\n\n
MicroPython: ESP32\/ESP8266 with DHT11\/DHT22 Web Server<\/a><\/li>