Circuit Documentation
Summary
This circuit is designed to power and connect an ESP32 microcontroller with a 3.3V power supply. The power is provided by a 3.7V battery, which is charged through an 18650 lithium-ion charger module. The charger module can be powered via a USB connection from a breadboard adapter. The 3.3V regulator steps down the voltage from the battery to a level that is safe for the ESP32. The ground connections are shared among the components to complete the circuit.
Component List
ESP32 (30 pin)
- Description: A 30-pin ESP32 microcontroller module, which is the main computing unit of the circuit.
- 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
3.3V Regulator
- Description: A voltage regulator that outputs a stable 3.3V from a higher voltage input.
- Pins: GND, OUT, Vin
18650 Lithium Ion Charger
- Description: A charging module for 18650 lithium-ion batteries, with input for charging and output for the battery.
- Pins: V IN, GND, OUT, IN, BAT IN, BAT GND
3.7V Battery
- Description: A rechargeable 3.7V lithium battery that provides power to the circuit.
- Pins: +, -
USB-Breadboard Adapter
- Description: A USB to breadboard power supply adapter.
- Pins: GND, ID, D+, D-, VCC
Wiring Details
ESP32 (30 pin)
- GND: Connected to the common ground net.
- Vin: Connected to the 3.3V regulator's output.
3.3V Regulator
- GND: Connected to the common ground net.
- OUT: Connected to the ESP32's Vin pin.
- Vin: Connected to the 18650 lithium-ion charger's OUT pin.
18650 Lithium Ion Charger
- V IN: Connected to the USB-breadboard adapter's VCC pin.
- GND: Connected to the common ground net.
- OUT: Connected to the 3.3V regulator's Vin pin.
- IN: Connected to the common ground net.
- BAT IN: Connected to the 3.7V battery's + pin.
- BAT GND: Connected to the 3.7V battery's - pin.
3.7V Battery
- +: Connected to the 18650 lithium-ion charger's BAT IN pin.
- -: Connected to the 18650 lithium-ion charger's BAT GND pin.
USB-Breadboard Adapter
- GND: Connected to the common ground net.
- VCC: Connected to the 18650 lithium-ion charger's V IN pin.
Documented Code
There is no embedded code provided for the microcontrollers in this circuit. If code is later provided, it will be documented in this section.