![Controlling an External LED using a Raspberry Pi and GPIO pins | by Shahbaz Ahmed | We've moved to freeCodeCamp.org/news | Medium Controlling an External LED using a Raspberry Pi and GPIO pins | by Shahbaz Ahmed | We've moved to freeCodeCamp.org/news | Medium](https://miro.medium.com/v2/resize:fit:1400/0*Zpa1YOQcMlvu-Sxs.png)
Controlling an External LED using a Raspberry Pi and GPIO pins | by Shahbaz Ahmed | We've moved to freeCodeCamp.org/news | Medium
![relay - Connecting pins of Raspberry Pi GPIO in series in order to turn up the voltage - Electrical Engineering Stack Exchange relay - Connecting pins of Raspberry Pi GPIO in series in order to turn up the voltage - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/RPAhu.png)
relay - Connecting pins of Raspberry Pi GPIO in series in order to turn up the voltage - Electrical Engineering Stack Exchange
![Amazon.com: Low Voltage Labs – Pi Traffic Light and GPIO Plus Reference Board Combo Pack for The Raspberry Pi A+, B+, 2, 3, 3B+ and 4 : Electronics Amazon.com: Low Voltage Labs – Pi Traffic Light and GPIO Plus Reference Board Combo Pack for The Raspberry Pi A+, B+, 2, 3, 3B+ and 4 : Electronics](https://images-na.ssl-images-amazon.com/images/I/81TFNaO8UzL._AC_UL600_SR600,600_.jpg)