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Battery-Powered ESP32 Smart Display with Fingerprint Sensor

Image of Battery-Powered ESP32 Smart Display with Fingerprint Sensor

Circuit Documentation

Summary

This document provides a detailed overview of a circuit design that includes an ESP32 microcontroller, a 0.96" OLED display, a LiPo battery charger module, two 18650 Li-ion batteries, a rocker switch, a battery indicator, and an AS608 fingerprint sensor. The circuit is designed to be powered by the Li-ion batteries and includes a charging module for recharging the batteries. The ESP32 microcontroller interfaces with the OLED display and the fingerprint sensor.

Component List

  1. ESP32 (30 pin)

    • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
    • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

  2. 0.96" OLED

    • Description: A small OLED display used for visual output.
    • Pins: GND, VDD, SCK, SDA

  3. LiPo Battery Charger Module

    • Description: A module used to charge LiPo batteries.
    • Pins: B-, B+, OUT-, OUT+

  4. 18650 Li-ion Battery x 2

    • Description: Rechargeable Li-ion batteries used to power the circuit.
    • Pins: +, -

  5. Rocker Switch

    • Description: A switch used to control the power supply to the circuit.
    • Pins: 1, 2

  6. Battery Indicator

    • Description: A module used to indicate the battery level.
    • Pins: +, -

  7. AS608

    • Description: A fingerprint sensor used for biometric authentication.
    • Pins: VCC, TX, GND, RX

Wiring Details

ESP32 (30 pin)

  • GND is connected to:

    • LiPo Battery Charger Module (OUT-)
    • Battery Indicator (-)
    • 0.96" OLED (GND)
    • AS608 (GND)

  • Vin is connected to:

    • Battery Indicator (+)
    • Rocker Switch (2)

  • D22 is connected to:

    • 0.96" OLED (SCK)

  • D21 is connected to:

    • 0.96" OLED (SDA)

  • TX2 is connected to:

    • AS608 (RX)

  • RX2 is connected to:

    • AS608 (TX)

  • 3V3 is connected to:

    • 0.96" OLED (VDD)
    • AS608 (VCC)

0.96" OLED

  • GND is connected to:

    • ESP32 (GND)
    • AS608 (GND)

  • VDD is connected to:

    • ESP32 (3V3)
    • AS608 (VCC)

  • SCK is connected to:

    • ESP32 (D22)

  • SDA is connected to:

    • ESP32 (D21)

LiPo Battery Charger Module

  • OUT- is connected to:

    • ESP32 (GND)
    • Battery Indicator (-)

  • OUT+ is connected to:

    • Rocker Switch (1)

  • B- is connected to:

    • 18650 Li-ion Battery (-)

  • B+ is connected to:

    • 18650 Li-ion Battery (+)

18650 Li-ion Battery x 2

  • - is connected to:

    • LiPo Battery Charger Module (B-)

  • + is connected to:

    • LiPo Battery Charger Module (B+)

Rocker Switch

  • 1 is connected to:

    • LiPo Battery Charger Module (OUT+)

  • 2 is connected to:

    • ESP32 (Vin)
    • Battery Indicator (+)

Battery Indicator

  • - is connected to:

    • LiPo Battery Charger Module (OUT-)
    • ESP32 (GND)

  • + is connected to:

    • ESP32 (Vin)
    • Rocker Switch (2)

AS608

  • GND is connected to:

    • 0.96" OLED (GND)
    • ESP32 (GND)

  • VCC is connected to:

    • 0.96" OLED (VDD)
    • ESP32 (3V3)

  • TX is connected to:

    • ESP32 (RX2)

  • RX is connected to:

    • ESP32 (TX2)

Code

No code is provided for this circuit.

This document provides a comprehensive overview of the circuit design, including a detailed list of components and their wiring connections. This should serve as a useful reference for building and troubleshooting the circuit.