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 <-- 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)

Now that you know a bit about Netzwerke, take a look at the Arduino Serial library functions:

file:///C:/Program%20Files%20(x86)/Arduino/reference/www.arduino.cc/en/Reference/Serial.html

and the Processing Serial Library functions:

file:///C:/Users/hanna/OneDrive/Documents/processing-3.5.4/modes/java/reference/libraries/serial/index.html

and this overview is wonderful:

https://learn.sparkfun.com/tutorials/connecting-arduino-to-processing/all

Arduino and Processing have a set of examples that demonstrate sending data back and forth between them.

SerialCallResponse

ARDUINO > open > examples > communication: SerialCallResponse

this Arduino example code uses the function:

Serial.write(sensorValue); // Writes binary data to the serial port. This data is sent as a byte or series of bytes.

file:///C:/Program%20Files%20(x86)/Arduino/reference/www.arduino.cc/en/Serial/Write.html

the Processing example code then uses the following function to read the value:

int inByte = myPort.read();

SerialCallResponseASCII

ARDUINO > open > examples > communication: SerialCallResponseASCII

this Arduino example code uses the function:

Serial.print(sensorValue); // Prints data to the serial port as human-readable ASCII text.

the Processing example code then uses the following functions to read and trim the incoming value:

String myString = myPort.readStringUntil('\n');

myString = trim(myString); // removes any bytes other than the linefeed

int sensors[] = split(myString, ','); // split the string at the commas

you can also convert the String to an Integer at the same time:

int sensors[] = int(split(myString, ',')); // split the string at the commas and convert the sections into integers

PROCESSING <-- OSC --> PROCESSING

INSTALL : PROCESSING OSC LIBRARY

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

2) type “OSC” in the search box

3) select the OSC library

4) click on “Install”

CHALLENGE: Arduino <-- Serial --> PROCESSING <-- OSC --> PROCESSING <-- Serial --> Arduino

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”

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”);

[diagram]