Ok Google with Arduino and ESP8266

Control your electronics with an Google Assistant + Arduino UNO + ESP8266

REQUIREMENTS

• Android phone Marsmallow or higher or Apple phone (for Google Assistant)
• IFTTT Account
• Blynk App Account
• Arduino UNO
• ESP8266 (ESP-01) WiFi Module
• Some Jumper Cables
• Relay SRD-05VDC-SL-C (Optional)
• USB TTL Serial (Optional)
• 5V to 3.3V Logic Converter (Optional)

PINOUT

Use the PINOUT FINAL if you done with anything in this project.

PINOUT FINAL

The basic pinout of this project.

UNO	ESP-01
D2 (as TX)	RX
D3 (as RX)	TX
GND	GND
3V3	3V3
3V3	EN

UNO	LED
D7	ANODE (+)
GND	CATHODE (-)

UNO	RELAY
D8	IN
5V	VCC
GND	GND

PINOUT FLASHING ESP-01

Use this pinout only when you need to flash your ESP-01 Firmware

ESP-01	USB TTL
TX	RX
RX	TX
GND	GND
IO2	GND
3V3	3V3
EN	3V3

PINOUT AT COMMAND MODE ESP-01

Use this pinout when you need to interact with AT Command only

ESP-01	USB TTL
TX	RX
RX	TX
GND	GND
3V3	3V3
EN	3V3

Then use Serial Monitor from Arduino IDE to interact with AT

FLASHING ESP8266 (Optional)

Use this if your ESP8266 have old or deprecated firmware installed. Remember to use PINOUT FLASHING ESP-01 for your jumper cable pinout in this step.

FLASH ESP-01 WITH ESPTOOL

FIRMWARE ESP-01 :

1. AT V1.6.2
2. SDK V2.2.1

Flash SDK First > Then Flash AT Afterward

esptool.py --port /dev/ttyUSB0 --baud 115200 write_flash --flash_size 1MB --flash_mode dio <MEMORY ADDRESS 0> <FILE-0.BIN> <MEMORY ADDRESS 1> <FILE-1.BIN> <MEMORY ADDRESS N> <FILE-N.BIN>

Memory Address :

File	Address
boot_v1.2.bin	0x00000
user1.1024.new.2.bin	0x01000
esp_init_data_default.bin	0xfc000
blank.bin	0x7e000 & 0xfe000

INSTALLATION

Setting up Blynk

1. Follow instruction on http://blynk.cc/getting-started/
2. Download and install Blynk App for Android or IOS
3. Install Blynk Library for Arduino IDE
4. Open Blynk App
5. Create 'New Project'
6. Choose 'Arduino UNO' and 'WiFi' then click 'Create'
7. Get the Blynk Auth Token. Note it
8. Click on + sign on the top and one Button
9. Click on Button and set the pin to 'Digital' and 'D7'. Set pin values to 1 and 0. Set switch to 'Push'
10. Create same as step 5 for D8 pin

Setting up IFTTT

1. Register IFTTT account
2. Create Trigger (IF)
3. Search Google Assistant
4. Select 'Say a phrase with a text ingredient'. Enter everything you need.
5. Choose Action (THEN)
6. Search Webhooks
7. Click on 'Make a web Request'
8. Set the action

URL

http://blynk-cloud.com/YourBlynkAuthToken/update/D7

Replace YourBlynkAuthToken with your Auth Token that you get from Setting Up Blynk step.

Method

PUT

Content Type

application/json

Body

["1"]

and accept etc. That body part decides what you put in D7 pin. Apparenly this will make the led light up. Then you can define another IFTTT Applet to write ["0"] on the pin to turn it off. And create again for D8 pin.

Upload Code and Test

Don't forget to import the Blynk Library to your Arduino IDE. You can follow this instructions for import the library to your Arduino IDE. Use OkGoogleArduino.ino sketch code. Don't forget to edit this variable:

char auth[] = "8f180320xxxxxxxxxc458c50faa";
char ssid[] = "iPhone 5S";
char pass[] = "11211111";

Replace it with your Blynk auth key, WiFi access point, and WiFi password. If your WiFi has no password, then use this.

char pass[] = ""

Result

Logs

This is the log from Serial Monitor if everything is running without any problems.

22:19:06.581 ->     ___  __          __
22:19:06.581 ->    / _ )/ /_ _____  / /__
22:19:06.615 ->   / _  / / // / _ \/  '_/
22:19:06.648 ->  /____/_/\_, /_//_/_/\_\
22:19:06.682 ->         /___/ v0.6.1 on Arduino Uno
22:19:06.715 -> 
22:19:07.148 -> [598] Connecting to iPhone 5S
22:19:10.381 -> [3815] AT version:1.6.2.0(Apr 13 2018 11:10:59)
22:19:10.414 -> SDK version:2.2.1(6ab97e9)
22:19:10.448 -> compile time:Jun  7 2018 19:34:26
22:19:10.613 -> Bin version(Wroom 02):1.6.2
22:19:10.613 -> OK
22:19:15.681 -> [9121] +CIFSR:STAIP,"192.168.200.30"
22:19:15.714 -> +CIFSR:STAMAC,"3c:71:bf:38:a9:de"
22:19:15.777 -> [9131] Connected to WiFi
22:19:26.315 -> [19739] Ready (ping: 44ms).

TROUBLESHOOT

Sometime you'll get error like this from Serial Monitor.

ESP is not responding.

SET ESP-01 BAUD RATE TO 9600 VIA AT COMMAND (Recommended)

The default baud rate for ESP8266-01 is 115200. You maybe need to set it to 9600. Remember to use this PINOUT AT COMMAND MODE ESP-01 for your jumper cable pinout to enter AT Command mode.

AT
AT+UART_DEF=9600,8,1,0,0

If you still get ESP is not responding log, then maybe you need to recheck your jumper cable pinout. And because some reason you need to upgrade your ESP8266 firmware, so you can follow this FLASHING ESP8266 step.