TTGO ESP32 SIM800L GPS Tracker with OLED Display & Microphone

** 🚗📡 Real-time GPS tracker & speed alert system** built on the TTGO T-Call ESP32 with SIM800L GSM/GPRS, OLED display animations, and microphone support.

✨ Features

• 🗺 GPS Tracking – Live location & speed from GPS module.
• 📩 SMS Alerts – Sends a warning if speed exceeds your limit.
• 📟 OLED UI – Smooth animations, gauges & status icons (U8g2).
• 🎙 Microphone Input – Ready for sound detection or audio features.
• ⚙ Customizable – Set speed limits, phone numbers & animations in config.h.

🛠 Hardware

• TTGO T-Call ESP32 (SIM800L)
• GPS module (UART: pins 12 / 14)
• OLED display
• Microphone (MIC_POS = pin 36, MIC_NEG = pin 39)

📦 Libraries

• U8g2 – OLED graphics
• TinyGSM – GSM module
• TinyGPS++ – GPS parsing

🚀 Getting Started

1. Wire up your TTGO T-Call, GPS, OLED & mic as per config.h.
2. Edit settings in config.h – phone number, speed limit, animations.
3. Upload the code to your ESP32 via Arduino IDE.
4. Power on & watch live GPS data, animations, and alerts in action.

This project implements a real-time GPS tracking and communication system using the TTGO T-Call ESP32 with SIM800L GSM/GPRS module. It integrates GPS positioning, speed monitoring, OLED display animations, microphone input, and SMS alert capabilities, making it suitable for vehicle tracking, speed alerting, and security applications.

Key Features

• Real-Time GPS Tracking

  • Retrieves latitude, longitude, and speed from the GPS module.
  • Displays live GPS data on the OLED screen with graphical gauges.

• GSM/GPRS Communication (SIM800L)

  • Sends SMS alerts when speed exceeds a configurable limit (SPEED_LIMIT).
  • Displays calling and SMS animations on the OLED screen.

• OLED Display with Animated UI

  • Smooth transitions and icons using the U8g2 graphics library.
  • Splash screens, status icons, and data visualizations for a professional look.

• Speed Alert System

  • Configurable speed threshold triggers SMS alerts.
  • Visual speedometer with dynamic needle movement.

• Microphone Integration

  • Audio input support via dedicated MIC pins (MIC_POS and MIC_NEG).
  • Can be extended for sound detection or voice communication features.

• Customizable Configurations

  • Change pin mappings, animation speeds, and alert numbers via config.h.

Technical Details

• Board: TTGO T-Call ESP32 (SIM800L)

• GPS Module: Connected via UART (pins GPS_RX / GPS_TX).

• Display: OLED using U8g2 library for optimized rendering.

• Mic Input: Analog pins 36 (MIC+) and 39 (MIC-).

• Libraries Used:

  • U8g2lib for OLED display
  • TinyGSM for SIM800L control
  • GPS parsing libraries (e.g., TinyGPS++)

• Configurable Parameters:

  • Speed limit, animation delay, and phone numbers set in config.h.

Thanks to https://javl.github.io/image2cpp/ for making the icons 2 cpp code.
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