Resistors: Pull-up and pull-down resistors - Latest Open Tech From Seeed

Applications for Resistors and Pull-up and Pull-down Resistors - IoTbyHVM

Tutorial of Pull Up and Pull Down Resistor

Are pull-up resistors needed for shift registers (constant current sink drivers)? - Electrical Engineering Stack Exchange

Better SPI Bus Design

What is Pull Up and Pull Down Resistor and Where to Use them?

Pull-up vs Pull-down resistors – Robocraze

Pull-up vs Pull-down resistors – Robocraze

Tutorial of Pull Up and Pull Down Resistor

Funny Electronics: What is Pull Up Resistor ? How Does Pull Up Resistor Works ?