Control the Balance Maze With Alexa

Control the balance maze with Alexa

Move the maze by voice.

First of all, please see the video.

It is a summary of operation.

1. Talk to Alexa (Raspberry Pi + AVS)
   SAY: Alexa
2. Start Skill
   SAY: BARANSU MEIRO WO KIDOU SHITE
3. Instruct Skill
   SAY: 1 DO, UE NI SHITE
4. Skill communicates with Raspberry Pi and throws a command
5. Raspberry Pi moves servo motor

I will explain how to make it.

Let's buy Amazon Echo.

As of January 2018, Amazon echo can not be obtained due to limited sale in Japan.

Therefore, I created an Alexa device using Raspberry Pi.
https://github.com/alexa/alexa-avs-sample-app/wiki/Raspberry-Pi

Set up a custom Skill.

1. Create Skills with Alexa Skills Kit
Amazon Alexa Skills Kit
https://developer.amazon.com/ja/docs/ask-overviews/build-skills-with-the-alexa-skills-kit.html

Define four intents and one slot.

2. Custom Skill on IBM Cloud
You can use it for free by using the light account.
https://www.ibm.com/cloud/lite-account

1) Configure Node-RED on the IBM Cloud.
https://nodered.org/docs/platforms/bluemix

2) Install (copy & paste) the flow.

Create a maze game.

1. Servo and servo folder
Servo uses Tower-pro SG90. Please refer to the URL for details. 3D data can also be downloaded.
https://www.thingiverse.com/thing:746116

2. Maze game (light stuff, made with styrene board)

3. Ball (Light stuff)

4. Raspberry Pi (using Raspberry Pi 3B)

Connect the servo to the Raspberry Pi.

1. Align the direction of the servo.
Connect the upper line to GPIO 12 (32 PIN).
Connect the lower line to GPIO 18 (12 PIN).

2. LED that glows when Skill is activated
Connect an LED with 200 Ω to 330 Ω on the anode. GPIO04(7 PIN)
Connect Graund(9 PIN)

Install the software on the Raspberry Pi.

1. GPIO
　Chattering is done with Rpi.GPIO installed in the standard.
　Therefore, I will install pi-gpiod.
　This is because the PWM output is stable.

　Installation method

sudo apt-get install pigpio python-pigpio python3-pigpio
http://abyz.me.uk/rpi/pigpio/index.html

　Start the daemon
　　 sudo pigpiod

2. Node-RED
　Install the library for pi-gpiod.
　　https://flows.nodered.org/node/node-red-node-pi-gpiod

Install the dashboard library for debugging.
https://flows.nodered.org/node/node-red-dashboard

3. Creating flow Please import (Copy & Paste) the following files to Node-RED.

　Deploy when you can copy normally.

Please pronounce to Alexa.

1. Speak as "Alexa, activate the balance maze".

When the skill is activated, the LED turns on.

2. You are in dialog mode and you can talk without saying a wake word.

3. Speak as "Once you speak up", the maze moves in the specified direction.

4. Speak as "Stop", maze stop.

Happy instructables.