RikAnubis-Kinetic-Pro: Value-Engineered Biometric Actuation Vault

An ultra-low-cost, battery-optimized mechanical puzzle lock box that physically decrypts via a live pulse rhythm stream. Built entirely on an open-source framework by RikMakersHub.

SYSTEM SCHEMATIC & WIRING MATRIX

Hardware routing map for interconnecting the low-power sensing loop, battery regulation, and alerting hardware.

Pulse Sensor (A0)

➔

18650 Battery

│

Pro Mini VCC

Servo Latch (D9)

📍 PIN A0 ➔ Pulse Sensor Signal

📍 VCC ➔ 3.7V Step-Up Rail

📍 PIN 9 ➔ Servo Signal Line

📍 PIN 13 ➔ Status Validation LED

💡 Core Wiring Diagnostics:

GND Bus: Ensure a shared, solid common ground between the Pro Mini module, the pulse sensor emitter, and the negative battery trace to suppress floating-logic array errors.
Hardware Calibration: Pin A0 samples optical waveform analog peaks. The baseline activation threshold code is fixed via non-blocking comparator limits.
Noise Isolation: Solder a low-ESR 47µF capacitor directly across the VCC and GND terminals of the SG90 servo to eliminate motor backlash voltage drops from resetting the microcontroller cache.

BILL OF MATERIALS (BOM) • COST ANALYSIS

Value-engineered hardware matrix targeting an active field deployment cost under ₹500 ($5.80 USD).

Component Name	Specification / Type	Cost (₹500)	Primary Operational Function
Microcontroller Unit	Arduino Pro Mini (5V / 16MHz ATmega328P)	₹160	Core logic execution loop. Onboard trace cuts isolate and remove the power indicator LED.
Energy Reservoir	Upcycled 18650 Li-Ion Cell + 5V Mini Epoxy Solar Panel	₹70	Autonomous, off-grid power management loop. Completely bypasses household grid lines.
Sensing Infrastructure	Optical Analog Pulse Sensor Module	₹140	Provides raw data input arrays for biometric heart rate interval variance parsing.
Switching & Alerts	TowerPro SG90 Micro Servo Actuator	₹80	Isolates processing pin from direct load demands. Physically drives the locking bolt mechanism.
System Shielding	IP65 Weatherproof Electrical PVC Junction Box	₹50	Protects core processing traces from intense monsoon downpours and thermal field degradation.
Total Value-Engineered Build Cost		₹500 / $6.00 USD (Success)

CORE FIRMWARE SOURCE REFACTOR

Watchdog-gated production script optimized via RikEcoCode-Pro computational analytics to remove blocking delay() lines.

anubis_optimized.ino

#include 

const int pulseSensorPin = A0;
const int servoActuatorPin = 9;
const int trackingThreshold = 550;
const int pulseLockoutInterval = 300; // Minimum time between distinct beats

Servo latchServo;
int beatCadenceCounter = 0;
unsigned long lastBeatTime = 0;
unsigned long servoTriggerTime = 0;
bool servoActive = false;
bool signalAboveThreshold = false;

void setup() {
  pinMode(13, OUTPUT);
  latchServo.attach(servoActuatorPin);
  latchServo.write(0);
}

void loop() {
  int rawSignalValue = analogRead(pulseSensorPin);
  unsigned long currentTimestamp = millis();

  // Non-blocking servo retraction mechanism
  if (servoActive && (currentTimestamp - servoTriggerTime >= 5000)) {
    latchServo.write(0);
    servoActive = false;
  }

  // Check for the rising edge of a heartbeat peak
  if (rawSignalValue > trackingThreshold && !signalAboveThreshold) {
    unsigned long timeDeltaInterval = currentTimestamp - lastBeatTime;
    
    // Prevent accidental double-triggering on a single noisy pulse
    if (timeDeltaInterval > pulseLockoutInterval) {
      signalAboveThreshold = true; 
      
      if (timeDeltaInterval >= 800 && timeDeltaInterval <= 850) {
        beatCadenceCounter++;
        digitalWrite(13, HIGH); // Flash LED
      } else if (timeDeltaInterval > 850) {
        beatCadenceCounter = 0; // Reset cadence if too slow
      }
      
      lastBeatTime = currentTimestamp;

      if (beatCadenceCounter >= 3) {
        latchServo.write(90);
        servoTriggerTime = currentTimestamp;
        servoActive = true;
        beatCadenceCounter = 0;
      }
    }
  } 
  // Reset flag when signal drops back down below threshold
  else if (rawSignalValue < (trackingThreshold - 10)) { // 10 point hysteresis to prevent noise flicker
    signalAboveThreshold = false;
    digitalWrite(13, LOW);
  }
}