If the SPI device needs to communicate back to Raspberry Pi, then it will send data back using the MISO (Master In Slave Out) pin. Data is synchronized using a clock ( SCLK at GPIO11) from the master (RPi) and the data is sent from the Pi to our SPI device using the MOSI (Master Out Slave In) pin. It is used by the Raspberry pi board to quickly communicate between one or more peripheral devices. SPI (Serial Peripheral Interface) is another protocol used for master-slave communication.

Hardware PWM is available on these pins only: GPIO12, GPIO13, GPIO18, GPIO19.

Some specific pins are: PWM (pulse-width modulation) pins: When this pin is set to HIGH, the voltage at the output is 3.3V and when set to LOW, the output voltage is 0V.Īlong with the simple function of input and output pins, the GPIO pins can also perform a variety of alternative functions.

Note: Do not connect a device with an input voltage above 3.3V to any of the GPIO pins, or else it will fry the Raspberry Pi.Ī GPIO pin set as an output pin sends the voltage signal as high (3.3V) or low (0V). A voltage between 1.8V and 3.3V will be read by the Raspberry Pi as HIGH and if the voltage is lower than 1.8V will be read as LOW. Raspberry Pi 3 Input/Outputs pins:Ī GPIO pin that is set as an input will allow a signal to be received by the Raspberry Pi that is sent by a device connected to this pin. All the voltages are measured with respect to the GND voltage. GND: Ground is commonly referred to as GND.

This pin can use to power up the Raspberry Pi, and it can also use to power up other 5v devices.ģ.3V: The 3v pin is there to offer a stable 3.3v supply to power components and to test LEDs. The board consists of two 5V pins, two 3V3 pins, and 9 ground pins (0V), which are unconfigurable.ĥV: The 5v pins directly deliver the 5v supply coming from the mains adaptor.

Raspberry Pi 3B+ GPIO Pinout Raspberry Pi 3 Power Pins:

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