Workshop.md

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Internet of Things Workshop

Salinity Sensor Prototype

ESP32 & I²C

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Salinity Sensor

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Salinity Sensor

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Wheatstone bridge

• Two voltage dividers
• 
• Only enabled when needed

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Amplifier

• Voltage followers
  • Stable reading
• Differential amplifier
  • 

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ATtiny

• Reads Amplifier Output
• Moving Average Filter
• Sends Reading Over I²C

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ESP32 DOIT V1

• Microcontroller
• Arduino + WiFi & Bluetooth
• 30 pins

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Setting up the Arduino IDE

1. https://www.arduino.cc/en/software
2. Open "File > Preferences > Additional Board Manager URLs" and add: https://dl.espressif.com/dl/package_esp32_index.json
3. Open the Boards Manager at "Tools > Board > Boards Manager", search for "ESP32" and press the install button for "ESP32 by Espressif Systems"

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Testing Arduino IDE

1. Select "DOIT ESP32 DEVKIT V1" at "Tools > Board"
2. Select the correct COM port under "Tools > Port"
3. Choose an example program in "File > Examples > Examples for DOIT ESP32 DEVKIT V1 > WiFi > WiFiScan"
4. Program the code to the ESP32 with the Upload button (➡)
5. Open the Serial Monitor via "Tools > Serial Monitor" and set the Baud-rate to "115200 baud"
6. If you can see the nearby WiFi networks everything is working!

Source: https://microcontrollerslab.com/install-esp32-arduino-ide/

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Soldering the Salinity Sensor

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Connecting to the Salinity Sensor

Using I²C and an ESP32

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I²C

• I²C = Inter-Integrated Circuit
• Invented in 1982 by Philips
• SDA = Serial Data Line
• SCL = Serial Clock Line
• Every target has his own address ''

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Send to serial monitor

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

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Send to serial monitor

void setup() {
  Serial.begin(115200); // Open the serial port at 115200 baud
}

/* Send "Salamu, Dunia!" via serial every second. */
void loop() {
  Serial.println("Salamu, Dunia!"); // Send text over the serial port
  delay(1000); // Wait 1000ms or 1s
}