5.Embedded programming¶

How to choose an microC:¶

physical pins how many I/O ports do I need do I have analog I/O power consumption microC I/O devices speed environment cost Analog Signal :

Voltage change measured with oscilloscope Digital Signal :

0s and 1s (binary) measured with logic analyzer

I am using the high-quality microcontroller XIAO-ESP32-C6.¶

XIAO ESP32-C6 is a compact and powerful microcontroller from Seeed Studio, built on the ESP32-C6 chip by Espressif. It supports Wi-Fi 6 (802.11ax), Bluetooth 5 (LE), Thread, and Zigbee, making it an excellent choice for IoT projects.

Key Features: - ✅ Processor: RISC-V 32-bit, clock speed up to 160 MHz - ✅ RAM: 512 KB SRAM - ✅ ROM: 4 MB Flash memory - ✅ Connectivity: Wi-Fi 6, Bluetooth 5 (LE), Thread, Zigbee - ✅ GPIO: 14 pins (including I2C, SPI, UART, ADC, PWM, GPIO) - ✅ Power Supply: 5V via USB Type-C - ✅ Connectors: USB Type-C, Li-Po battery support - ✅ Form Factor: XIAO (21 x 17.5 mm)

Advantages: - 🔹 Wi-Fi 6 support for fast and energy-efficient communication - 🔹 Low power consumption, ideal for IoT devices - 🔹 Compact size, suitable for wearable electronics and embedded solutions - 🔹 Zigbee and Thread support for smart home applications - 🔹 Compatible with Arduino, MicroPython, and ESP-IDF

Applications: - ✅ Smart home (Zigbee, Thread) - ✅ IoT automation - ✅ Portable devices - ✅ Robotics - ✅ Wearable electronics

Practice in Wokwi¶

Code language c++¶

#define led1 D2
#define led2 D3
#define led3 D4
#define button D5
int val = 0;
void setup() {
  Serial.begin(115200);
  pinMode(D2, OUTPUT);
  pinMode(D3, OUTPUT);
  pinMode(D4, OUTPUT);
  pinMode(button , INPUT_PULLUP);
  Serial.println("");
  Serial.println("Hello, XIAO ESP32-C6!");
  Serial.println("Fab academy 2025");
}

void loop() {
 int butt = digitalRead(button);

 if(butt == 0){
 val++;
 delay(300);
 }
 Serial.println(val);
 if(val == 1){
 digitalWrite(led1 , HIGH);
 }
 if(val == 2){
 digitalWrite(led2 , HIGH);
 }
 if(val == 3){
 digitalWrite(led3 , HIGH);
 }
 if(val == 4){
 val = 0;
 digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
   digitalWrite(led3,LOW);
 }

}