HTMAA 2024 - Week 9

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Week 9: Output Devices

This week focuses on adding and programming output devices. Below, you will find a demonstration of how I added LEDs to my circuit, along with the code that makes them blink to indicate whether the hydrofoil vehicle is functioning properly.

LED Blinking Example

To provide visual feedback on my hydrofoil vehicle's status, I used two LEDs on pins D1 and D4. One LED turns on while the other is off, alternating at one-second intervals.

LED Setup
The switch (LED 1 setup)
LED Setup
The switch (LED 2 setup)

Here is the code:


// Define pins for the two LEDs
const int led1 = D1; 
const int led2 = D4;

void setup() {
  // Initialize the LED pins as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  // Turn LED on D1 ON and LED on D4 OFF
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  delay(1000); // Wait for 1 second

  // Turn LED on D1 OFF and LED on D4 ON
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  delay(1000); // Wait for 1 second
}

Power Consumption

For this setup, I am using a Seeed Studio XIAO ESP32C3 to power the two LEDs. Under typical operating conditions, the XIAO ESP32C3 itself consumes around 80–120 mA during active operation. Each LED draws roughly 10 mA when lit.

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