Everything is Talkative

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We like to embed electronics in everything these days, and while we’re at it why not include wifi so that everything can communicate with everything via The Internet.

introduction to networks

Netwerk

how things are talking with each-other using electricity

ELECTRICITY LAYER

ON / OFF

Binary: 0,1 HIGH, LOW ON, OFF 0V, 5V GND, VCC

BINARY ENCODING, 8BIT/1BYTE

2^8=256

ASCII

American Standard Code for Information Interchange

UNICODE

51107648386_c8811ce95e_c.jpg


HARDWARE LAYER

PARALLEL

DB-25 51107072372_a9693d8f1f_c.jpg

SERIAL

RS232: Recomended Standard USB: Universal Serial Bus 51107392694_ddf8a54b29_c.jpg

ETHERNET

TRANSPORT LAYER

NETWORK, LAN, IP

IP: Internet Protocol LAN: Local Area Network Ethernet 51107649681_30924fff2d_c.jpg 51107649946_8bc206738f_c.jpg 51107650276_c11f5bd2c4_c.jpg

UDP (SEND MODEL)

User Datagram Protocol

TCP (CONNECT, SEND, RECEIVE MODEL)

Transmission Control Protocol

ENCODING LAYER

OSC (ADDRESS MODEL)

Open Sound Control

HID

Human Interface Device

PUBLISH <-> SUBSCRIBE MODEL

MQTT

MQTT: Message Queuing Telemetry Transport 49856212336_cf2c240d1e_c.jpg 49856212466_3997636a84_c.jpg 51108424240_08b766bdc7_c.jpg


examples

ARDUINO Uno / Flora <-- Serial --> PROCESSING

PROCESSING <-- OSC --> PROCESSING

PROCESSING <-- MQTT(shiftr.io) --> PROCESSING

PROCESSING MQTT INSTALL

follow these instructions to install the MQTT Processing library: 1) in the Processing top menu go to: “Sketch” –> “Import Library” –> “Import Library” 2) type “MQTT” in the search box 3) select the MQTT library by Joel Gaehwiler 4) click on “Install” DONE!

ARDUINO ESP32 <-- MQTT(shiftr.io) --> PROCESSING

ARDUINO ESP32 INSTALL

follow these instructions to install the ESP32 Arduino library:

1 Menu: Preferences —> Additional Boards Manager URLs: https://dl.espressif.com/dl/package_esp32_index.json

2 Menu: Tools —> Boards —> Boards Manager: search for: “ESP32” Install: “esp32 by Espressif Systems”

3 Menu: Tools —> Board: ESP32 Dev Module Menu: Tools —> Port: dev/cu… (unplug and plug to see which port appears) Menu: Tools —> Flash Mode: QIO Menu: Tools —> Flash Size: 4MB Menu: Tools —> Flash Frequency: 80Mhz Menu: Tools —> Upload Speed: 115200

ARDUINO MQTT INSTALL

1 Menu: Sketch —> Include Library —> Manage Libraries

2 search for: “MQTT”

3 Install: MQTT library for Arduino by Joel Gaehwiler

TEST: ESP ARDUINO CONNECTION

Menu: File —> Examples —> Basics —> “Blink” edit: LED_PIN = 2; —> blue LED should blink on/off


TEST: ESP SENSOR CONNECTION

READ ANALOG SENSOR Menu: File —> Examples —> Communication —> “Graph” edit: Serial.begin(115200); edit: pick a GPIO pin with and ADC (GPIO = General Purpose In Out) (ADC = Analog Digital Converter) for example: analogRead(34);

Note: ADC2 pins cannot be used when Wi-Fi is used. So, if you’re using Wi-Fi and you’re having trouble getting the value from an ADC2 GPIO, you may consider using an ADC1 GPIO instead, that should solve your problem.


SEND: SENSORDATA OVER MQTT

Menu: File —> Examples —> MQTT —> ESP32DevelopmentBoard

edit: your wifi info: your network name / SIID (SIID = Service Set Identifier) your password

edit: the “ClientID” so that you can see yourself connect: client.connect(“ClientID”, “try”, “try”)

edit: the topics you subscribe and publish to by adding “/yourName” you can also change the “message” you are sending!

client.subscribe(“/hello/yourName”);

client.publish(“/hello/yourName”, “message”);