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  "title": "AZ Mandible Arduino Firmware",
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  "content": "/* AZ Mandible – Prototype Firmware v1.0 ------------------------------------- Hardware: - Piezo (27mm) → 1M bias → Op-amp → A0 - Bone conduction transducer (TT25-8) via PAM8403 → D9 (PWM) - Arduino Nano Function: - Detects intentional jaw movement peaks - Simple classification: 1 clear peak → YES 2 quick peaks → NO - Private bone-conduction feedback */ const int PIEZO_PIN = A0; const int FEEDBACK_PIN = 9; // PWM to PAM8403 / transducer // ===== TUNABLE VALUES ===== int threshold = 80; // Start here, adjust with Serial Plotter const int DEBOUNCE_MS = 80; const int WINDOW_MS = 600; // Time window to count peaks const int MIN_PEAK_GAP = 120; // Minimum time between peaks // ===== STATE ===== int peakCount = 0; unsigned long lastPeakTime = 0; unsigned long windowStart = 0; bool inWindow = false; void setup() { Serial.begin(115200); pinMode(FEEDBACK_PIN, OUTPUT); analogWrite(FEEDBACK_PIN, 0); Serial.println(\"AZ Mandible v1.0 ready\"); Serial.println(\"1 peak = YES | 2 peaks = NO\"); Serial.println(\"Open Serial Plotter to tune threshold\"); } void loop() { int value = analogRead(PIEZO_PIN); // Debug output for Serial Plotter Serial.println(value); unsigned long now = millis(); // Peak detection if (value > threshold) { if (now - lastPeakTime > MIN_PEAK_GAP) { // Valid new peak if (!inWindow) { inWindow = true; windowStart = now; peakCount = 1; } else { peakCount++; } lastPeakTime = now; } } // Window timeout → classify if (inWindow && (now - windowStart > WINDOW_MS)) { classify(peakCount); peakCount = 0; inWindow = false; } delay(5); // small loop delay } void classify(int peaks) { if (peaks == 1) { Serial.println(\"→ YES\"); playFeedback(1); // single tone } else if (peaks >= 2) { Serial.println(\"→ NO\"); playFeedback(2); // double tone } } void playFeedback(int type) { if (type == 1) { // YES – single medium beep tone(FEEDBACK_PIN, 600, 120); delay(140); } else if (type == 2) { // NO – two short beeps tone(FEEDBACK_PIN, 400, 80); delay(120); tone(FEEDBACK_PIN, 400, 80); delay(100); } analogWrite(FEEDBACK_PIN, 0); } Aziel Eliab research, hardware, legal AZ Mandible Arduino Firmware Aziel, mandible, corpus",
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