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.