Digital I/O - Beginner's Guide to PIC Programming - picguides.com
Tutorial 07: digitalRead() and Serial Port Communication - Programming Electronics Academy
Arduino project: read a digital input
How to Check an Input Pin of PIC Microcontroller - Engineering Xpert
Read an Analog Input with Arduino | Starting Electronics
How to Use input output ports of pic18f452 microcontroller
ESP32 Digital Inputs and Digital Outputs (Arduino IDE) | Random Nerd Tutorials
The Basics of Arduino: Reading Switch States
ESP8266 NodeMCU Digital Inputs and Digital Outputs (Arduino IDE) | Random Nerd Tutorials
Saeed's Blog: How to use PIC16F877A pin as input? (Code+Proteus simulation)
The Basics of Arduino: Reading Switch States
How To Use Arduino's Analog and Digital Input/Output (I/O) - Projects
The Basics of Arduino: Reading Voltage
The Basics of Arduino: Reading Switch States
Saeed's Blog: How to use PIC16F877A pin as input? (Code+Proteus simulation)
Getting started with the micro:bit Adapter - Sphero Support & Help | Sphero's Knowledge Base
Arduino Analog Input Read from Pin with analogRead A to D Example
PIC Microcontrollers Input/Output Ports Tutorial - GPIO Pins - MPLAB XC8
Digital Read in Arduino
Counting with digital input reading Ardunio digital pin - NI Community
Read Analog Voltage | Arduino Documentation
inputoutput-ports - MIKROE
Digital Read Serial | Arduino Documentation
