This document covers the interfacing of an I2C LCD with the ESP8266 NodeMCU, highlighting the importance of communication among multiple microcontrollers in embedded systems. It explains the I2C communication protocol, its ease of implementation, and practical steps for setting up the I2C LCD with the NodeMCU, including library installation and wiring instructions. The document also provides circuit design and program code for successful integration.

1. NodeMCU Course
NodeMCU with I2C LCD

2. NodeMCU with I2C LCD
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• In IoT, LCD is rarely required, but some times its useful
to monitor errors and connection related issues. In this
lesson we are interfacing I2C LCD with ESP8266.

3. NodeMCU with I2C LCD
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• Embedded Systems should be connected with each other to transfer data
between them. Because all operations can’t be performed on a single
system.
• For example, Arduino has 6 analog pins but NodeMCU has only one
analog pin. So two are more microcontrollers or microprocessors can be
combined to form a required embedded system.
• The connection can be established through any of the following
protocols.
SPI
I2C
UART

4. I2C Communication Protocol
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• The I2C communication bus is very popular and broadly used by
many electronic devices because it can be easily implemented in
many electronic designs which require communication between a
master and multiple slave devices or even multiple master devices.
• The easy implementations comes with the fact that only two wires
are required for communication between up to almost 128 (112)
devices when using 7 bits addressing and up to almost 1024
(1008) devices when using 10 bits addressing.

5. I2C Communication Protocol
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6. I2C Communication Protocol
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7. I2C LCD
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8. I2C LCD
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9. I2C LCD
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10. NodeMCU with I2C LCD
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• I2C Address of LCD

11. NodeMCU with I2C LCD
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Step 1: Installing I2C LCD Library for ESP8266 and ESP32
• This library is tested for different types of LCD displays like
16×2, 16×4, 20×2, 20×4 with both ESP32 and ESP8266, it also
works with other ESP modules.
Step 2: Install it in Arduino IDE
• Click on Sketch >> Include Library >> Add .ZIP Library

12. NodeMCU with I2C LCD
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13. NodeMCU with I2C LCD
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• Step 3: Interface ESP8266 With I2C LCD Module

14. Components
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• I2C LCD Display Module PCF8574
• 16×2 LCD Display
• Connection Wires
• Single row female connector
• NodeMCU

15. NodeMCU with I2C LCD
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• I2C LCD Module ESP8266
• GND <——————-> GND
• VCC <——————-> Vin
• SDA <——————-> D2 (NodeMCU) GPIO 4
• SCL <——————-> D1 (NodeMCU) GPIO 5

16. Circuit Design
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17. Circuit Design
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18. Program Code
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• LCD

19. Result
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20. Thank you

21. Email: elafe1888@gmail.com
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