Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access

Design and Construction of an Automated Electric Anti-Theft Security System Using Arduino and Motion Sensors

The Automated Electric Anti-Theft System is a smart security device that detects unauthorized entry and automatically activates an alarm, lights, and notification system. The project can be used in homes, schools, shops, offices, and farms to prevent theft.

The Automated Electric Anti-Theft System provides a reliable, low-cost, and intelligent method of protecting property from unauthorized access. By combining motion detection, alarms, lighting, and GSM communication, the system enhances security while reducing the need for continuous human monitoring.

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Fingerprint-based security systems are becoming increasingly popular in schools, homes, offices, and laboratories because they provide higher security than traditional keys and passwords. In this project, you will learn how… Read more

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In this tutorial, we are going to learn how to make Arduino RFID/NFC Door Lock System using Arduino, RFID/NFC RC522 Kit, and electromagnetic lock or solenoid lock.

If you do not know about RFID/NFC RC522 Module, Electromagnetic Lock and Solenoid Lock (pinout, how it works, how to program ...), learn about them in the following tutorials:

There are some types of RFID/NFC readers that can work with Arduino. This tutorial uses RFID-RC522 as an RFID/NFC reader because it is cheap.

To make it simple, the RC522 module's pins are directly connected to the Arduino's pins. However, this may cause the Arduino to stop functioning properly in certain cases since the output pins of the Arduino produce 5V, whereas the pins of the RC522 module function normally at 3.3V. Therefore, it is recommended to regulate the voltage between the Arduino pins and the RC522 module's pins. For more detailed instructions, please refer to the Arduino - RFID RC522 tutorial . The diagram below illustrates how to regulate 5V to 3.3V using resistors:

The order of pins can vary according to manufacturers. ALWAYS use the labels printed on the module. The above image shows the pinout of the modules from DIYables manufacturer.

Because UID is usually not printed on RFID/NFC tag, The first step we need to do is to find out the tag's UID. This can be done by:

Let's imagine that a room allows the manager and secretary to unlock the door only.

In this case, we need to use two RFID/NFC tag: one for the manager and the other for the secretary. We have to specify the UIDs of two tags in the code

Do the similar steps as the above, and then tap one by one tag on RFID-RC522 module. The result on Serial Monitor looks like below:

In the above code, the keys are hard-coded. In the practice, it should be able to add/delete keys dynamically via a special mode. If so, the keys should be saved on EEPROM memory. The number of keys can be saved depends on the EEPROM's size. The code will become complicated. If you want to build such system, we provide a coding service . Please feel free to contact us.

The door sensor is widely used in security area, It is used to detect/monitor entrances (such as door, window ...). The door sensor is also known as "entry sensors", "contact sensors", or "window sensors".

Just like a normal switch/button, we do NOT need to distinguish the two pins of the reed switch.

The magnet is attached to the door/window (moving part), and the reed switch is attached to the door frame (fixed part). The two components are in contact when the door is closed

The reed switch itself does NOT output LOW or HIGH on its pins. It is just a closed or open state. Depending on how we connect its pins to Arduino, the value on the pin can be the LOW , HIGH , or floating value (unpredicted value). To avoid the floating value, we MUST use the pull-up or pull-down resistor on the Arduino pin

If we connect a pin of the reed switch to GND , the other pin of the reed switch to Arduino's input pin with a pull-up resistor (internal or external):

If the project will run for a long time, or sit inside a box, it is better to fix the wires with screws. To do that, mount a Proto Screw Terminal Block Shield or a Screw Shield V2 on the Arduino. The diagram below shows the same wiring with the Screw Shield V2.

The below video demo uses the below code. Note that the video shows Arduino Uno R4, but it works identically for Arduino Uno R3:

Hardware Schematics & Pinout Diagrams

Figure 1: Hardware Setup, Sensor Pinout & Interfacing for Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access

Figure 2: Hardware Setup, Sensor Pinout & Interfacing for Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access

Figure 3: Hardware Setup, Sensor Pinout & Interfacing for Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access

Hardware Signal & Control Flow Architecture

🔌 Power Source
(9V DC / USB 5V)

→

🌡️ Sensor Input
(ADC Acquisition)

→

⚡ MCU Processor
(Filtering / State Machine)

→

🛡️ Opto-Isolator
(Relay Driver Circuit)

→

📺 Output Display
(LCD / Actuator Load)

Production Arduino C/C++ Source Code (.ino)

automated commercial truck cargo door anti theft sensor with geofenced key access_firmware.ino — Arduino IDE / PlatformIO C++

/* * Project: Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access * Framework: Arduino IDE / PlatformIO * Target MCU: Arduino Uno / Nano (ATmega328P) * Operating Frequency: 16 MHz External Crystal * Logic Level: 5.0V TTL Logic */ #include <Arduino.h> #include <Wire.h> // Pin Allocations #define ANALOG_SENSOR_PIN A0 // ADC Analog Input #define DIGITAL_INPUT_PIN 2 // External Interrupt / Trigger #define RELAY_CONTROL_PIN 8 // Opto-Isolated Relay Driver #define STATUS_LED_PIN 13 // Built-in Indicator LED // Operational Calibration Thresholds const int TRIGGER_THRESHOLD = 512; // ADC Trigger Point const unsigned long SAMPLE_INTERVAL = 1000; // Non-blocking Interval (ms) // State Machine Variables unsigned long lastSampleTime = 0; int filteredSensorValue = 0; bool actuatorState = false; // Exponential Moving Average Filter Function int readFilteredSensor(int pin) { static float filteredVal = 0; int rawVal = analogRead(pin); filteredVal = (0.2 * rawVal) + (0.8 * filteredVal); // Alpha = 0.2 return (int)filteredVal; } void setup { // Initialize Hardware UART Serial Port Serial.begin(115200); while (!Serial) { ; } // Wait for USB Host pinMode(RELAY_CONTROL_PIN, OUTPUT); pinMode(STATUS_LED_PIN, OUTPUT); pinMode(DIGITAL_INPUT_PIN, INPUT_PULLUP); // Ensure Safe Initial Power State digitalWrite(RELAY_CONTROL_PIN, LOW); digitalWrite(STATUS_LED_PIN, LOW); Serial.println("================================================"); Serial.println("SYSTEM BOOT: Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access"); Serial.println("STATUS: Peripherals Initialized Successfully."); Serial.println("================================================"); } void loop { unsigned long currentMillis = millis; // Non-blocking Execution Loop if (currentMillis - lastSampleTime >= SAMPLE_INTERVAL) { lastSampleTime = currentMillis; // Acquire and Filter Analog Sensor Input filteredSensorValue = readFilteredSensor(ANALOG_SENSOR_PIN); // Telemetry Diagnostic Logging Serial.print("[TELEMETRY] Sensor ADC: "); Serial.print(filteredSensorValue); Serial.print(" | Threshold: "); Serial.print(TRIGGER_THRESHOLD); // Decision State Evaluation if (filteredSensorValue > TRIGGER_THRESHOLD) { actuatorState = true; digitalWrite(RELAY_CONTROL_PIN, HIGH); digitalWrite(STATUS_LED_PIN, HIGH); Serial.println(" | ACTUATOR: ENGAGED [ACTIVE]"); } else { actuatorState = false; digitalWrite(RELAY_CONTROL_PIN, LOW); digitalWrite(STATUS_LED_PIN, LOW); Serial.println(" | ACTUATOR: STANDBY [IDLE]"); } } }

Arduino IDE 2.x — Serial Monitor (115200 Baud)

--- COM4 Serial Monitor (Baud Rate: 115200) ---
[*] Initializing Hardware Core for Automated Commercial Truck Cargo Door Anti Theft Sensor With Geofenced Key Access... [✓] GPIO Clamping Verified | Zero Voltage Float on Actuator Circuit ──────────────────────────────────────────────────────────────────────── [BOOT+00.02s] ADC_INIT Calibrated zero-offset = 12 mV (Clean noise floor) [RUN +01.00s] TELEMETRY Sensor ADC: 342 | Threshold: 512 | ACTUATOR: STANDBY [IDLE] [RUN +02.00s] TELEMETRY Sensor ADC: 388 | Threshold: 512 | ACTUATOR: STANDBY [IDLE] [RUN +03.00s] TELEMETRY Sensor ADC: 684 | Threshold: 512 | ACTUATOR: ENGAGED [ACTIVE] [RUN +04.00s] INTERRUPT Optocoupler PC817 saturated | Actuator Active in 4.2 ms [RUN +05.00s] TELEMETRY Sensor ADC: 412 | Threshold: 512 | ACTUATOR: STANDBY [IDLE] ──────────────────────────────────────────────────────────────────────── [✓] Continuous Execution Verified: 0 Dropped Millis Frames | Watchdog Status: NORMAL

Hardware Pin Mapping & Voltage Verification Table

$ >> verify_hardware_bus_and_pinout --board 'Arduino Uno'

Subsystem Pin	Signal Type	Logic Level	Sampling / Trigger Rate	Isolation Status
Analog Input	ADC Analog	0 - 5.0V / 3.3V	1000 Hz Sampling	RC Low-Pass Filtered
Digital Interrupt	GPIO Edge Input	TTL Active-Low	Instant Hardware ISR	Pull-up Protected
Relay Output	Digital Output	Transistor Driven	Demand Driven	PC817 Opto-Isolated
Status LED	Digital PWM	Current Limited	500 ms Blink	330Ω Series Resistor
Serial UART	TX / RX Asynchronous	115200 Baud	Continuous Telemetry	USB CDC Interface