This is the first in a series of intermediate electronics tutorials for Arduino and ESP8266/ESP32 projects. In this video, I'll be covering General Purpose Input and Outputs (GPIO) - which are the essential component through which your microprocessor interacts with the outside world.

Topics covered include digital/analog inputs and outputs, logic levels, floating inputs, pullup/pulldown resistors, PWM, ADC, high current applications, and port expanders.

I'll be illustrating two practical examples of components that typically use a lot of GPIOs - an LCD display output, and a matrix keypad input, and how you can use a port expander such as a PCF8574 or MCP23017 to connect both these devices (and many more!) using only two GPIO pins on your microprocessor, via an I2C interface.

00:00:00 - 00:02:57 Introduction
00:02:58 - 00:03:29 GPIO pins
00:03:30 - 00:05:35 Digital I/O with HIGH and LOW logic
00:05:36 - 00:09:02 Floating Inputs, PULL-UP and PULL-DOWN resistors
00:09:03 - 00:12:36 Digital Outputs and 3.3V/5V logic levels
00:12:37 - 00:14:30 Controlling High Current Output using transistors
00:14:31 - 00:16:27 Analog Output using PWM
00:16:28 - 00:17:41 Analog Inputs using ADC
00:17:42 - 00:19:39 GPIO pin availability and port expanders
00:19:40 - 00:21:29 GPIO hungry components: LCDs and Keypads
00:21:30 - 00:29:10 PCF8574 Port Expander Demo
00:29:11 - 00:40:08 Arduino Code
00:40:09 - 00:43:08 Alternative Port Expanders: MCP23017 (I2C) / MCPS17 (SPI)
00:43:09 - 00:43:59 Wrapup

For further details about this, or any of my other #escaperoom tutorial videos, please see [ Ссылка ]

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