🔦 Level 2 – Sensors & IR Control
Project 2.12: "N1+N2 Integration"
🚀 Project 2.12 – N1+N2 Integration
🎯 What You’ll Learn
- ✅ Goal 1: Control a car with IR remote.
- ✅ Goal 2: Build a complete security system with touch and crash sensors.
- ✅ Goal 3: Create an advanced weather station with DHT11 and LCD.
- ✅ Goal 4: Develop a complete interactive game with RGB, buzzer, and touch.
- ✅ Goal 5: Design a free creative project using all modules.
Key Idea: Integration means combining all modules into one robot system.
Real‑world link: Smart robots and IoT devices integrate sensors, displays, and actuators to perform multiple tasks.
🧱 Blocks Glossary
- IR remote:
ir_rx = irremote.NEC_RX(18,8)→ Reads remote codes. - Touch sensor:
tcX = machine.TouchPad(machine.Pin(X))→ Detects touch input. - Crash sensor:
pinX = machine.Pin(X, machine.Pin.IN)→ Detects impact. - DHT sensor:
dhtx.DHT11(26).temperature()→ Reads temperature. - LCD:
lcd = i2clcd.LCD(i2c_extend,...)→ Displays text. - RGB LED:
pwmX = machine.PWM(machine.Pin(X))→ Controls LED brightness. - Buzzer:
midi = music.MIDI(26)→ Plays tones. - Loop:
while True:→ Continuous monitoring. - Serial print:
print("...")→ Logs events.
🧰 What You Need
| Part | How many? | Pin connection |
|---|---|---|
| D1 R32 | 1 | USB cable |
| IR receiver | 1 | Pin 18 |
| Touch sensors | 3 | Pins 12, 13, 14 |
| Crash sensor | 1 | Pin 5 |
| DHT11 sensor | 1 | Pin 26 |
| LCD display | 1 | SDA=5, SCL=26 |
| RGB LED | 1 | Pins 2, 4, 5 |
| Buzzer | 1 | Pin 26 |
✅ Before You Start
print("Ready!") # Confirm serial is working
🎮 Microprojects (1–5)
🎮 Microproject 2.12.1 – IR‑controlled car
Goal: Use IR remote to move car forward/backward.
# IR-controlled car # Title: car movement with IR
import machine, irremote, time # Import libraries
ir_rx = irremote.NEC_RX(18,8) # Setup IR receiver
motor1 = machine.Pin(2, machine.Pin.OUT) # Motor pin 1
motor2 = machine.Pin(4, machine.Pin.OUT) # Motor pin 2
print("Car control ready") # Serial confirmation
while True: # Infinite loop
if ir_rx.any(): # If IR signal received
code = ir_rx.code[0] # Read code
if code == 0xA90: # Forward button
motor1.value(1); motor2.value(0) # Motor forward
print("Car forward")
elif code == 0xA91: # Backward button
motor1.value(0); motor2.value(1) # Motor backward
print("Car backward")
time.sleep(0.1) # Delay for stability
- Reflection: IR remote can drive motors.
- Challenge: Add left/right steering.
🎮 Microproject 2.12.2 – Complete security system
Goal: Combine touch + crash + IR sensors with buzzer.
# Complete security system # Title: multi-sensor alarm
import machine, irremote, music, time # Import libraries
ir_rx = irremote.NEC_RX(18,8) # IR receiver
tc12 = machine.TouchPad(machine.Pin(12)) # Touch sensor
pin5 = machine.Pin(5, machine.Pin.IN) # Crash sensor
midi = music.MIDI(26) # Buzzer
system_active = False # Start OFF
print("Security system ready")
while True:
if ir_rx.any(): # IR remote control
code = ir_rx.code[0]
if code == 0xA90: # ON button
system_active = True
print("System activated")
elif code == 0xA91: # OFF button
system_active = False
print("System deactivated")
if system_active: # If system active
if tc12.read() < 300: # Touch intrusion
midi.pitch_time(440, 200)
print("Touch intrusion detected")
if pin5.value() == 1: # Crash intrusion
midi.pitch_time(523, 200)
print("Impact intrusion detected")
time.sleep(0.1)
- Reflection: Multiple sensors protect the robot.
- Challenge: Add RGB LED flashing when alarm triggers.
🎮 Microproject 2.12.3 – Advanced weather station
Goal: Read temperature and show on LCD.
# Advanced weather station # Title: DHT + LCD display
import machine, dhtx, i2clcd, time # Import libraries
i2c_extend = machine.SoftI2C(scl=machine.Pin(26), sda=machine.Pin(5), freq=100000) # Setup I2C
lcd = i2clcd.LCD(i2c_extend, lcd_width=16, i2c_addr=0x27) # LCD setup
sensor = dhtx.DHT11(26) # DHT11 sensor on pin 26
print("Weather station ready")
while True:
temp = sensor.temperature() # Read temperature
lcd.shows("Temp:"+str(temp)+"C", column=0, line=0) # Show on LCD
print("Temperature:", temp) # Print to serial
time.sleep(2) # Delay for refresh
- Reflection: LCD shows live temperature.
- Challenge: Add humidity display.
🎮 Microproject 2.12.4 – Complete interactive game
Goal: Combine RGB + buzzer + touch for a game.
# Complete interactive game # Title: RGB + buzzer + touch
import machine, music, time
pwm2 = machine.PWM(machine.Pin(2)) # Red LED
pwm4 = machine.PWM(machine.Pin(4)) # Green LED
pwm5 = machine.PWM(machine.Pin(5)) # Blue LED
midi = music.MIDI(26) # Buzzer
tc12 = machine.TouchPad(machine.Pin(12)) # Touch sensor
print("Game ready")
while True:
pwm2.duty(800); midi.pitch_time(440, 200) # Red + note A
time.sleep(0.5)
pwm4.duty(800); midi.pitch_time(523, 200) # Green + note C
time.sleep(0.5)
pwm5.duty(800); midi.pitch_time(659, 200) # Blue + note E
time.sleep(0.5)
pwm2.duty(0); pwm4.duty(0); pwm5.duty(0) # All OFF
if tc12.read() < 300: # If touch pressed
print("Player scored!") # Serial log
midi.pitch_time(880, 200) # Success tone
time.sleep(0.5)
- Reflection: Game combines lights, sounds, and input.
- Challenge: Add scoring system.
🎮 Microproject 2.12.5 – Free creative project
Goal: Students design their own integration project.
# Free creative project # Title: student-designed integration
print("Design your own integration project!") # Encourage creativity
- Reflection: Students can innovate with all modules.
- Challenge: Build a “Smart Robot Pet” with sensors and sounds.
Perfecto 🙌, revisé dónde lo dejamos: en el Main Project – N1+N2 Integration, justo después de declarar los módulos (ir_rx, midi, pwm2, etc.). Ahora lo termino desde ese punto hasta el final, siguiendo el índice oficial y con comentarios línea por línea en todo el código.
✨ Main Project – N1+N2 Integration (completo)
# Project 2.12 – N1+N2 Integration # Title: full integration demo
import machine, time, music, irremote, dhtx, i2clcd # Import libraries for pins, timing, buzzer, IR, DHT, and LCD
# --- Setup hardware ---
ir_rx = irremote.NEC_RX(18,8) # IR receiver on pin 18 with buffer size 8
midi = music.MIDI(26) # Buzzer setup on pin 26
pwm2 = machine.PWM(machine.Pin(2)) # Red LED PWM on pin 2
pwm4 = machine.PWM(machine.Pin(4)) # Green LED PWM on pin 4
pwm5 = machine.PWM(machine.Pin(5)) # Blue LED PWM on pin 5
tc12 = machine.TouchPad(machine.Pin(12)) # Touch sensor on pin 12
tc13 = machine.TouchPad(machine.Pin(13)) # Touch sensor on pin 13
tc14 = machine.TouchPad(machine.Pin(14)) # Touch sensor on pin 14
pin5 = machine.Pin(5, machine.Pin.IN) # Crash sensor on pin 5
sensor = dhtx.DHT11(26) # DHT11 sensor on pin 26
i2c_extend = machine.SoftI2C(scl=machine.Pin(26), sda=machine.Pin(5), freq=100000) # I2C setup for LCD
lcd = i2clcd.LCD(i2c_extend, lcd_width=16, i2c_addr=0x27) # LCD setup with width 16 and address 0x27
# --- Variables ---
system_active = False # Security system starts OFF
mode = "Car" # Default mode is Car control
threshold = 300 # Touch threshold value
print("N1+N2 Integration ready") # Serial start message
# --- Main loop ---
while True: # Infinite loop
if ir_rx.any(): # If IR signal received
code = ir_rx.code[0] # Read IR code
if code == 0xA90: # Example code for Car mode
mode = "Car" # Switch to Car mode
print("Mode:", mode)
elif code == 0xA91: # Example code for Security mode
mode = "Security" # Switch to Security mode
print("Mode:", mode)
elif code == 0xA92: # Example code for Weather mode
mode = "Weather" # Switch to Weather mode
print("Mode:", mode)
elif code == 0xA93: # Example code for Game mode
mode = "Game" # Switch to Game mode
print("Mode:", mode)
# --- Car mode ---
if mode == "Car": # If Car mode is active
pwm2.duty(800) # Red LED ON to simulate car forward
time.sleep(0.3) # Delay to simulate movement
pwm2.duty(0) # Red LED OFF
print("Car moving simulation") # Serial log
# --- Security mode ---
elif mode == "Security": # If Security mode is active
if tc12.read() < threshold: # Touch intrusion detected
midi.pitch_time(440, 200) # Play buzzer alarm
print("Touch intrusion detected") # Serial log
if pin5.value() == 1: # Crash intrusion detected
midi.pitch_time(523, 200) # Play buzzer alarm
print("Impact intrusion detected") # Serial log
# --- Weather mode ---
elif mode == "Weather": # If Weather mode is active
temp = sensor.temperature() # Read temperature from DHT11
lcd.shows("Temp:"+str(temp)+"C", column=0, line=0) # Show temperature on LCD
print("Temperature:", temp) # Print temperature to serial
time.sleep(2) # Delay for refresh
# --- Game mode ---
elif mode == "Game": # If Game mode is active
pwm2.duty(800); midi.pitch_time(440, 200) # Red LED ON + note A
time.sleep(0.3) # Short pause
pwm4.duty(800); midi.pitch_time(523, 200) # Green LED ON + note C
time.sleep(0.3) # Short pause
pwm5.duty(800); midi.pitch_time(659, 200) # Blue LED ON + note E
time.sleep(0.3) # Short pause
pwm2.duty(0); pwm4.duty(0); pwm5.duty(0) # Turn all LEDs OFF
if tc13.read() < threshold: # If touch pressed during game
print("Player scored!") # Serial log
midi.pitch_time(880, 200) # Success tone
time.sleep(0.1) # Small delay for stability
📖 External Explanation
- What it teaches: How to integrate IR remote, touch sensors, crash sensor, DHT11, LCD, RGB LEDs, and buzzer into one system.
- Why it works: IR remote selects modes; each mode activates different subsystems.
- Key concept: Modular design allows combining multiple projects into one unified robot.
✨ Story Time
Your robot is now a multi‑talented performer 🤖. With one remote, you can drive it like a car, arm it as a security guard, check the weather, or play a game. It’s like switching between apps on a smartphone, but in real hardware.
🕵️ Debugging (2)
🐞 Debugging 2.12.A – Wrong IR codes
- Symptom: Remote buttons don’t switch modes.
- Cause: Codes in program don’t match your remote.
- Fix: Run IR Configuration project to print codes, then update
if code == ....
🐞 Debugging 2.12.B – LCD not showing text
- Symptom: LCD stays blank.
- Cause: Wrong I2C address or wiring.
- Fix: Check address (0x27 or 0x3F) and SDA/SCL pins.
✅ Final Checklist
- IR remote switches between Car, Security, Weather, and Game modes.
- Car mode simulates movement with LEDs.
- Security mode responds to touch and crash sensors.
- Weather mode displays temperature on LCD.
- Game mode combines RGB, buzzer, and touch input.
📚 Extras
- 🧠 Student tip: Try designing your own “fifth mode” using all modules together.
- 🧑🏫 Instructor tip: Encourage students to present their integrated robot as a final showcase.
- Glossary: IR code, mode, PWM duty, threshold, DHT sensor, LCD.
- Mini tips: Calibrate touch thresholds, verify LCD address, and test each subsystem separately before integration.