Zayan Ahmed

student@botrix.tech • NUST / GIKI Robotics Member • Verified Student Lab Pass

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Module 01 • Microcontrollers 75% Done

ESP32 & FreeRTOS Industrial IoT Mastery

Dual-core task scheduling, MQTT telemetry, Wi-Fi web servers, and low-power deep sleep modes.

12 of 16 lessons completed Est. Certificate: 2 days

Module 02 • Robotics 40% Done

Autonomous Mobile Robots with ROS 2 & LiDAR

Differential drive kinematics, 2D SLAM mapping using RPLiDAR A1, and Nav2 path planning.

8 of 20 lessons completed Next: LiDAR TF2 transforms

Module 03 • Hardware Engineering 90% Done

Custom PCB Design with KiCAD & SMT Assembly

Schematic capture, high-current motor traces, 4-layer stackup, and solder paste stencil reflow.

9 of 10 lessons completed Final Project Pending

Lab Manual • Hardware Guide

Botrix Discovery Kit: Autonomous Line Follower

Arduino / C++

Wiring Pinouts:

Left IR Sensor: Pin D2 (Digital In)

Right IR Sensor: Pin D3 (Digital In)

Motor A (IN1, IN2): Pin D5, Pin D6 (PWM)

Motor B (IN3, IN4): Pin D9, Pin D10 (PWM)

Starter Firmware (Tested in Botrix Lab):

// Botrix Discovery Kit - Fast Line Follower Firmware
#define IR_LEFT  2
#define IR_RIGHT 3
#define ENA 5
#define IN1 6
#define IN2 7
#define IN3 8
#define IN4 9
#define ENB 10

void setup() {
  pinMode(IR_LEFT, INPUT);
  pinMode(IR_RIGHT, INPUT);
  pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT); pinMode(IN4, OUTPUT);
  analogWrite(ENA, 180); // 70% Speed
  analogWrite(ENB, 180);
}

void loop() {
  int left = digitalRead(IR_LEFT);
  int right = digitalRead(IR_RIGHT);

  if (left == LOW && right == LOW) {
    // Both on line -> Forward
    digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW);
    digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW);
  } else if (left == HIGH && right == LOW) {
    // Drifted left -> Turn right
    digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW);
    digitalWrite(IN3, LOW);  digitalWrite(IN4, HIGH);
  } else if (left == LOW && right == HIGH) {
    // Drifted right -> Turn left
    digitalWrite(IN1, LOW);  digitalWrite(IN2, HIGH);
    digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW);
  }
}

Botrix Hardware Lab Tasks

Task #01 • Completed

Benchmark DHT22 vs BME280 precision on I2C bus

Verified by Lab Mentor • 100 / 100 Points

Verified

Task #02 • In Progress

Assemble 10 Discovery Kit sensor shields

Due: Sept 26, 2026 • Hardware Testing Lab 2

Task #03 • Review Pending

Prepare Arduino pinout diagram for L298N Dual Motor Driver

Submitted for review • Mentor: Engr. Maajid

Under Review

Maker & Student Project Showcase

Share your robotics and IoT builds with the community in Pakistan.

By Zayan Ahmed • NUST

ESP32-CAM AI License Plate Scanner

Edge AI license plate OCR running on ESP32-CAM connected to a local SQLite logging server.

View GitHub Code →