Controlling LEDs on Raspberry Pi using Voice with Amazon Echo

The goal of this post is to create an Alexa skill [1] that controls three LEDs (red, yellow, and green) connected to Raspberry Pi’s GPIO pins. The skill will enable to turn ON/OFF each LED by specifying the color of light and the ON/OFF status via voice command.   Prerequisites (parentheses indicate my environment) Raspberry Pi… Continue reading “Controlling LEDs on Raspberry Pi using Voice with Amazon Echo”

Controlling LEDs with Raspberry Pi GPIO Pins

Controlling LED on Raspberry Pi is pretty easy. This post shows how to turn ON/OFF LEDs using Raspberry Pi’s GPIO pins with Python.   Setup (parentheses indicate my environment) Raspberry Pi board (Raspberry Pi3 B+) running Raspbian OS (Stretch with Desktop Nov. 2018 ver) LEDs (Pi Traffic Light) Micro USB cable for power supply   Steps… Continue reading “Controlling LEDs with Raspberry Pi GPIO Pins”

Adding Power Switch on Raspberry Pi

Below shows how I added a physical power switch to Raspberry Pi. It enables boot up, shutdown, and reboot Raspberry Pi board. (tested with Raspberry Pi Zero W running Raspbian Stretch November 2017 version.) Note: This switch does not actually power-up or power-down and Raspberry Pi board consumes some mA of current even after shutdown (i.e.… Continue reading “Adding Power Switch on Raspberry Pi”

Waking Up Raspberry Pi Using Reset Pin

This post shows steps to wake up Raspberry Pi 3 from other Raspberry Pi by using RUN (reset) pin. Background: I was looking for a way to wake up my Raspberry Pi 3 from other device and found the information below, Resetting the board while in halt state wakes Raspberry Pi up [1] Raspberry Pi 3… Continue reading “Waking Up Raspberry Pi Using Reset Pin”