How are GPIO pins used for input and output?
GPIO interfaces vary widely. In some cases, they are simple—a group of pins that can switch as a group to either input or output. In others, each pin can be set up to accept or source different logic voltages, with configurable drive strengths and pull ups/downs.
How much current can you draw from a GPIO?
RPi GPIO input voltage and output current limitations. So, if you have set the current capability to 2 mA, do not draw more than 2 mA from the pin. Never demand that any output pin source or sink more than 16 mA. Current sourced by the outputs is drawn from the 3.3 V supply, which can supply only 50 mA maximum.
How is the duty cycle of GPIO controlled?
Typically, this is accomplished via PWM, in which the duty cycle of the GPIO output signal determines the effective magnitude of the process control signal. For example, when controlling light intensity, the light may be dimmed by reducing the GPIO duty cycle.
Which is an example of an integrated circuit GPIO?
Integrated circuit GPIOs are commonly used to control or monitor other circuitry (including other ICs) on a board. Examples of this include enabling and disabling the operation of (or power to) other circuitry, reading the states of on-board switches and configuration shunts, and driving light-emitting diode (LED) status indicators.
How are GPIOs used in microcontroller circuitry?
Some microcontroller devices (e.g., Microchip dsPIC33 family) incorporate internal signal routing circuitry that allows GPIOs to be programmatically mapped to device pins. Field-programmable gate arrays (FPGA) extend this ability by allowing GPIO pin mapping, instantiation and architecture to be programmatically controlled.
What does GPIO in Raspberry Pi stand for?
Let’s summarize. GPIO stands for General Purpose, Input, Output. All the processors you use to have at least a few, a Raspberry Pi and an Arduino have a lot of General Purpose Input Output that you can design your circuits and you can read your sensors off of.
What does an open drain do on a GPIO?
When you actually use an input on a GPIO, sometimes you have an output device that will only pull it down. It’s called an Open Drain and it’ll only pull something down. But it lets the input float if the device isn’t turned on.