Openframeworks Raspberry PI GPIO interfaces, SPI (Serial Peripheral Interface), I2C (Inter Integrated Circuit), IO Pin read/write.

Example simple Button Read state:

• Raspberry pi (2/3/Zero/A/A+/B+)
• Button

fritzing example:

Example simple Led Blink:

• Raspberry pi (2/3/Zero/A/A+/B+)
• Led

fritzing example:

Example simple Relay on / off Light:

• Raspberry pi (2/3/Zero/A/A+/B+)
• Relay 5v
• Lamp

fritzing example:

Example GPS UART: http://aprs.gids.nl/nmea/

• Raspberry pi (2/3/Zero/A/A+/B+)
• GPS breakout v3

fritzing example:

Example i2c multiple byte read MPU6050:

• Raspberry pi (2/3/Zero/A/A+/B+)
• MPU6050

fritzing example:

Example Led Matrix8x8:

• Raspberry pi (2/3/Zero/A/A+/B+)
• Led Matrix

fritzing example:

Example Servo motor(Attention raspberry not to have pin PWM, for this we use a CLK pin, advice integrated pwm):

• Raspberry pi (2/3/Zero/A/A+/B+)
• Servo Motor

fritzing example:

Example GPIO read/write stepper rotation:

• Raspberry PI
• Stepper Motor bipolar
• sn754410ne H-Bridge
• Button
• wiring

fritzing example:

sn754410ne H-Bridge:

video: http://www.youtube.com/watch?v=lwRd5D9EuU0

Example GPIO I2C communication:

• Raspberry PI
• Arduino
• LED
• Resistor 75 ohm
• wiring

fritzing example:

video: http://www.youtube.com/watch?v=SRz750EdjfY

Example GPIO SPI add Analog pin MCP3008 potentiometer:

• Raspberry
• MCP3008
• Potentiometer
• wiring

fritzing example:

MCP3008 8-Channel 10-Bit ADC

video: http://www.youtube.com/watch?v=PkDkCJyZ2go

for i2c and SPI configuration visit this page:

https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-spi
https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c