GPIO Default State
Before connecting a button to an MCU’s GPIO, we must use a resistor to set up the default GPIO state. The GPIO pin’s default state…
First StepsA collection of 12 posts
2 Min Read
Connecting a Button to an ESP32
In this chapter, we’ll learn how to connect a button to the ESP32 GPIO pin 22, explore the difference between connecting the button to 3.3V…
1 Min Read
Internal Pull-Up and Pull-Down
The ESP32 has built-in pull-up and pull-down resistors, which can be enabled in software using the pinMode() function. The resistance values for the internal pull-up…
2 Min Read
Resistor
Why Is a Resistor Necessary? Can we use a jumper wire connect to VCC or GND to setup the default state for button instead of…
2 Min Read
Project – RGB LED (Digital)
RGB LEDs have three individual LEDs inside—red, green, and blue. These LEDs usually share a common connection, which can either be a cathode (negative terminal)…
1 Min Read
Project – RGB LED (Analog)
In the previous project, we learned how to control an RGB LED using digitalWrite. By using digitalWrite, we could turn the internal red, green, and…
2 Min Read
74HC595 8-Bit Shift Registers
The Birth of the 74 Series The 74 series ICs started back in the 1960s. Texas Instruments (TI) created these chips to help engineers build…
4 Min Read
Project – Binary Display
In this project, we’re going to create a fun binary counter using the 74HC595 shift register and 8 LEDs. The LEDs will light up to…
1 Min Read
Buzzer
A buzzer is a small electronic device that produces sound when powered. It is commonly used in alarms, notifications, and indicators in various electronic projects….
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