esp32-sensors

⚙️ Setup V1 (Base System)

🔗 References

-> [https://www.espboards.dev/esp32/esp32-wroom-32d-oled/](esp32 OLED Pinout)

-> [https://www.fisicalive.altervista.org/Coding/37%20SENSOR%20KIT%20TUTORIAL%20FOR%20UNO%20AND%20MEGA%20v2.0.0.19.08.7.pdf](ELEGOO 37 Sensor Kit V2)

🧩 Components

• ESP32 ESP-WROOM from diymore (Dev Board)
• 0.96" OLED (I2C, SSD1306)
• 2x Yellow LEDs (rail indicator)
• 220Ω resistors (for LEDs)
• 2x 100µF capacitors (power stabilization)

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🔌 Wiring Overview

OLED (I2C)

• VCC → 3.3V
• GND → GND

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Power Rails

• Breadboard top + bottom rails powered
• Each rail has:
  • 1x LED (visual power indicator)
  • 1x 100µF capacitor (bulk stabilization)

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💡 Design Decisions

LEDs on rails

Used as visual power indicators:

• confirms power distribution (3.3V with approx. 5.5-7mA)
• useful for debugging and video clarity

⚠️ Note: LED ≠ stable voltage indicator (only presence of voltage)

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100µF Capacitors

Used for:

• buffering voltage drops
• stabilizing ESP32 + OLED during load spikes

⚠️ No small decoupling capacitors yet (planned for future versions)

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🖥️ Software State

• OLED working (Adafruit SSD1306)
• text rendering via snprintf
• modular structure started:
  • display_init()
  • build_text()
  • display_print_text()

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🚧 Limitations (V1)

• no real sensors connected yet

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🚀 Next Steps

• integrate real sensors