Solar-Powered Arduino Circuit Documentation

Summary

This document provides a detailed overview of a solar-powered circuit designed to charge a Li-ion 18650 battery and power an Arduino UNO microcontroller. The circuit utilizes a solar panel to generate electrical power, which is then managed by a TP4056 charging module to safely charge the battery. A XL6009 step-up buck converter is used to boost the voltage to a suitable level for powering the Arduino UNO. The Arduino UNO is programmed to perform user-defined tasks, which are not specified in the provided code.

Component List

Solar Panel

• Description: A photovoltaic panel that converts sunlight into electrical energy.
• Pins: + (Positive), - (Negative)

TP4056

• Description: A lithium battery charger module with overcharge protection and LED indicators.
• Pins: OUT- (Output Negative), B- (Battery Negative), B+ (Battery Positive), OUT+ (Output Positive), IN- (Input Negative), IN+ (Input Positive)

XL6009 Step-Up Buck Converter

• Description: A DC-DC converter that steps up the voltage from a lower voltage source.
• Pins: OUT + (Output Positive), OUT- (Output Negative), IN+ (Input Positive), IN- (Input Negative)

Li-ion 18650 Battery

• Description: A rechargeable battery commonly used in portable electronics.
• Pins: - (Negative), + (Positive)

Arduino UNO

• Description: A microcontroller board based on the ATmega328P, widely used for building digital devices and interactive objects.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0 to A5, SCL, SDA, AREF, D13 to D0

Wiring Details

Solar Panel

• + connected to TP4056 IN+
• - connected to TP4056 IN-

TP4056

• IN+ connected to Solar Panel +
• IN- connected to Solar Panel -
• OUT- connected to XL6009 IN-
• B- connected to Li-ion 18650 Battery -
• B+ connected to Li-ion 18650 Battery +
• OUT+ connected to XL6009 IN+

XL6009 Step-Up Buck Converter

• IN+ connected to TP4056 OUT+
• IN- connected to TP4056 OUT-
• OUT + connected to Arduino UNO Vin
• OUT- connected to Arduino UNO GND

Li-ion 18650 Battery

• + connected to TP4056 B+
• - connected to TP4056 B-

Arduino UNO

• Vin connected to XL6009 OUT +
• GND connected to XL6009 OUT-

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Note: The provided code is a template and does not contain any functional code. Users are expected to fill in the setup() and loop() functions with their specific application code.