![\"\"](\"https:\/\/gtechbooster.com\/media\/2026\/03\/005.webp\")
<\/a><\/div><\/div>It will allow us to communicate between Pi and the outside world. We have 40pins on Pi, we count these pins from left to right out of which seventeen pins are GPIO pins. Different pins are used for the different functions and can be connected to a number of external peripherals such as buttons, lights, relays, sensors, etc.<\/p>\n\n\n\n
![\"\"](\"https:\/\/gtechbooster.com\/media\/2018\/01\/raspberry-pi-gpio-layout-model-b-plus-rotated-2700x900.png\")
<\/a>- GPIO \u2013 are the standard pins that are used to turn on\/off the device.<\/li>
- Power source \u2013 There are different voltage level i.e 3.3V, 5V.<\/li>
- GND \u2013 These are the pins used to ground the devices.<\/li>
- I2C \u2013 Inter-integrated circuit pins allow us to connect and communicate to hardware modules which support the I2C protocol.<\/li>
- SPI \u2013 Serial peripheral interface bus, these pins can be used to connect and communicate to SPI devices, it also makes use of a different protocol.<\/li>
- UART \u2013 Universal asynchronous receiver\/transmitter are the serial pins used to communicate with other devices.<\/li><\/ul>\n\n\n\n
In this tutorial, we are going to learn how to use GPIO pins to blink an led followed by controlling it with a push button.<\/p>\n\n\n\n
Blinking a LED with the Raspberry Pi<\/strong><\/h2>\n\n\n\n
Prerequisites<\/h3>\n\n\n\n
- Raspberry Pi.<\/li>
- LED.<\/li>
- Breadboard.<\/li>
- Resistor(270ohm).<\/li>
- Jumper wires.<\/li><\/ol>\n\n\n\n
Hardware Setup<\/h4>\n\n\n\n
![\"\"](\"https:\/\/gtechbooster.com\/media\/2018\/01\/untitled-sketch-2_bb.png\")
<\/a><\/figure>\n\n\n\nThe easiest and quickest way to get an LED to blink is by looking at the pins of the GPIO and decide which one to use. The anode of the LED is connected to GPIO4(Physical pin 7) through a 270ohm (above 100ohm would be fine, higher the resistance dimmer is your led) resistor. Connect the cathode of the LED to GND.<\/p>\n\n\n\n
The GPIO Pins will act as a source and when it is activated it provides with 3.3V.<\/p>\n\n\n\n
Code<\/h2>\n\n\n\n
Here, we are making use of the Python programming language and the Raspberry Pi GPIO Library to create a script to blink an led. From the Raspberry Pi desktop, click on the Start Menu<\/em> (on the extreme left side of the taskbar). Go to Programming and Open up Python3 (IDLE)<\/em>. Then copy the code below:<\/p>
![\"\"](\"https:\/\/gtechbooster.com\/media\/2023\/01\/26001.jpeg\")
<\/a><\/div><\/div>\n\n\n\n![\"\"](\"https:\/\/gtechbooster.com\/media\/2018\/01\/untitled-sketch-2_bb.jpg\")
<\/a><\/figure><\/div>\n\n\n\n![\"\"](\"https:\/\/gtechbooster.com\/media\/2025\/10\/26002.jpg\")
<\/a><\/div><\/div>","protected":false},"excerpt":{"rendered":"