Everything is Talkative

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.

E X A M P L E S

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

1 download and install newest version of Processing (https://processing.org)

2 download and install newest version of Arduino (https://www.arduino.cc)

3 ARDUINO --> open --> EXAMPLES --> COMMUNICATION --> GRAPH

4 upload Arduino Code to Arduino

5 connect sensor to Arduino and open the Arduino Serial Monitor to see the values coming in

6 scroll down in the Arduino code and copy Processing code to a new Processing sketch

7 edit port name "myPort = new Serial(this, Serial.list()[0], 9600);"

8 run the Processing sketch

PROCESSING <-- OSC --> PROCESSING

INSTALL : PROCESSING OSC LIBRARY

1) in the Processing top menu go to: “Sketch” –> “Import Library” –> “Import Library”

2) type “OSC” in the search box

3) select the OSC library

4) click on “Install”

DONE!

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

INSTALL : PROCESSING MQTT 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!

see also: https://www.shiftr.io/try?lang=processing

ARDUINO <-- Serial --> PROCESSING <--- MQTT ---> PROCESSING <-- Serial --> ARDUINO

www.youtube.com/embed/8nRm6WNk57I

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

INSTALL: ARDUINO ESP32 HARDWARE

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

INSTALL : ARDUINO MQTT LIBRARY

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

2 search for: “MQTT”

3 Install: MQTT library for Arduino by Joel Gaehwiler

see also: https://www.shiftr.io/try?lang=arduino

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”);

T H E O R Y

how things are talking with each-other using electricity

an introduction to networks: Netwerk

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

HARDWARE LAYER

PARALLEL

DB-25

SERIAL

RS232: Recomended Standard USB: Universal Serial Bus

TRANSPORT LAYER

NETWORK, LAN, IP

IP: Internet Protocol LAN: Local Area Network Ethernet

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