1. Project Overview

This design aims to create an efficient, eco-friendly, and portable solar outdoor light to meet the lighting needs of outdoor activities such as camping, hiking, picnics, etc. By integrating advanced solar photovoltaic technology and energy-efficient LED lighting systems, this product aims to provide users with long-lasting, reliable lighting solutions while reducing the burden on the environment.

2. Market analysis

3. Design principles

The design of the solar outdoor portable light is based on the principle of solar photovoltaic conversion, which is the basis for its work. It converts the light energy from sunlight into electricity mainly through solar panels. Solar panels consist of multiple solar cells, each of which consists of two layers of differently doped semiconductor materials (the upper layer is P-type and the lower layer is N-type). When sunlight hits a solar panel, the photons transfer the light energy to the P-type semiconductor, forming electron-hole pairs. Due to the presence of the P-N junction, electrons and holes move separately in the direction of the electric field, forming an electric current, which converts light energy into electrical energy.

Due to the discontinuity and instability of solar energy, the electrical energy generated by solar panels needs to be stored for use at night or when there is not enough light. This design uses a lithium-ion battery as an energy storage device, which has the advantages of high energy density, long cycle life and no memory effect. When the solar panels receive sunlight, the electrical energy is supplied directly to the luminaire via a charging circuit and stored in a lithium-ion battery at the same time. When there is not enough light, the electrical energy stored in the battery is released and supplied to the luminaire to work.

4.Technical specifications

1. Solar Panels:
 - Material: monocrystalline silicon or polycrystalline silicon.
- Conversion rate: ≥20%
- Size: Determined according to the overall design of the lamp to ensure sufficient light receiving area.

2. LED Lighting System:
- Number of LEDs: Adjust according to lighting needs, generally recommend 5-10 high brightness LEDs
- Brightness adjustment: at least 3 brightness levels can be adjusted.

- Beam Angle: Wide-angle design for easy outdoor ambient lighting.

3. Brightness adjustment
- The design also has a brightness adjustment function, through the intelligent control system, the brightness of the luminaire can be automatically adjusted according to user needs and ambient lighting conditions.
- Brightness adjustment can be achieved through PWM (Pulse Width Modulation) technology, which changes the brightness of the LED by changing its duty cycle.
- Brightness adjustment function can not only meet different lighting needs, but also extend battery life.

4. Battery system:
- Type: Lithium-ion battery.
- Capacity: ≥2000mAh, guaranteed continuous lighting time of not less than 8 hours (low brightness mode)
- Charging time: about 4-6 hours full in direct sunlight.5. Charging management- The design also has the function of intelligent charging management, using advanced charging control chip, which can realize trickle, constant current and constant voltage three-stage charging to ensure the safe charging and long life of the battery.- The charging management module also has functions such as battery short circuit and over-temperature protection to effectively prevent battery damage and safety accidents.

6. Housing Material:
- Body: aluminum alloy + carbon fiber, waterproof grade IPX6.
- Surface Treatment: Anodized/Sandblasted for enhanced corrosion resistance and hand feel.

7. Additional Features:
- USB charging port: supports charging small electronic devices such as mobile phones.
- SOS mode: One key to start, emits a strong flash signal.

5. Design details

- Solar energy charge:tp4056
- 5v charge:ip2312
- Power display: MCU control
- 5v discharge::ip2312
- Battery protection dw01
- SCM STC Ai8051
- Light control pwm
- Battery status adc
- Low-level light
- Key control time1
- Debug uart

 

 

6. Program architecture design:

6.1 Hardware Resources

1.pwm
2.timer
3.adc
4.uart
5.key1,key2,key3

6.2 State Machines

1. KEY Key2 output PWM duty cycle: PWM100,PWM75,PWM50,PWM25 [3.6: key-brightness]
2. Key Key1 output LED mode: LED_Power_Show, LED_White, LED_YELLO, LED_RED_BLUE

3. Press key3 to output RGB light mode: mode 1, mode 2, off.

6.3 Interruptions

1.Timer0 key to detect interrupts
2.int2,int3 falling edge interrupts service

6.4 Development Plan

1. Keystroke monitoring
2. Output IO port control
3.PWM brightness adjustment

6.5 IO Pin Function Configuration

  1.1 :------- | pwm52/PWM1N/CCP2/T2CLKO/ADC1/P1.1

  1.2:LowLED   | QSPIIO3/PWMETI2_4/PWMETI1_4/PWM2P/ECI/RxD2/ADC2/P1.2

  1.3:IO-White | QSPIIO2/PWM6_2/PWM2N/CP0/TxD2/ADC3/P1.3

  1.4:IO-RED   | i2sws2/QSPINCS/PWM3P/CCP1/sda2/SS/ADC4/P1.4

  1.5:IO-YELLO | 2ssd2/QSPIIO0/pwm72/PWM3N/scl2/MOSI/ADC5/P1.5

  1.6:IO-BLUE  | I2SMCLK_4/I2SMCLK_2/QSPIIO1/PWM4P/MISO/RxD_3/ADC6/P1.6

  1.7:WORKLED  | I2SCK_2/QSPICLK/PWM8_2/PWM4N/SCLK/TxD_3/ADC7/P1.7

  3.0: RxD1

  3.1: TxD1

  3.2: LED-1   | I2SCK/PWM_ETI2/PWM_ETI1/SCL_4/SCLK_4/INT0/P3.2

  3.3: LED-2   | PWMAPS5/I2SMCLK/SDA_4/MISO_4/INT1/P3.3

  3.4: LED-3   | PWMAPS6/I2SSD/MOSI_4/T1CLKO/T0/P3.4

  3.5: LED-4   | I2SWS/PWMFLT/SS_4/T0CLKO/T1/P3.5

  3.6: KEY-brightness(brightness)  |P3.6/INT2/WR_2/RxD_2

  3.7: KEY-MAIN(menu)        |P3.7/INT3/RD_2/TxD_2

  0.0 : ADC_BAT       |PWM1P_2/RxD3/AD0/ADC8/P0.

  0.1 : ADC_SUN       |PWM5/PWM1N_2/TxD3/AD1/ADC9/P0.1

  0.2 : ADC_ExtPower  |PWM2P_2/RxD4/AD2/ADC10/P0.2

  0.3 : ADC_LightSen  |PWM6/PWM2N_2/TxD4/AD3/ADC11/P0.3

  0.4 : ADC_Temp      |P0.4/ADC12/AD4/T3/PWM3P_2

  5.2 : RGB-KEY       |QSPIIO2_2/PWM7_4/RxD4_2/P5.2

  4.2 : RxD2 (UART2)  |QSPIIO1_2/CCP0_2/MISO_3/RxD2_2/WR/P4.2

  4.3 : TxD2 (UART2)  |I2SCK_4/QSPICLK_2/CCP1_2/SCLK_3/TxD2_2/RxD_4/P4.3

  4.7 : Restart-Key   |PWMAPS6_2/QSPINCS_3/ADC_ETR/MCLKO/nRST/P4.7

  2.5 ：ws2812B-LEDs

I/O port configuration:
P0: Full high-impedance input, pull-down resistor

  P1:

  --P1.1 ~ P1.7: Push-pull output, high level forward

  --P1.0 ~ P1.1: High impedance input

  P3:

  --P3.0~P3.1, two-way port

  --P3.2~P3.5: Push-pull output, high-level forward

  --P3.6~P3.7: High impedance input

  P5:

  --P5.2 High impedance input

  P4:

  P4.2~P4.3: Bidirectional, uart logs

  P4.7: High-impedance input

6.6 Implementing Features

- Control the function switching of the light by pressing button 1
- Short press - shows the current battery level
    - 1. White light
    - 2. Yellow light
    - 3. White and yellow lights
    - 4. Warning lights
  - Press and hold
    - 1. Power off, turn off all functions
    - 2. Turn on and display the battery level
- Control the brightness of the light by pressing button 2
  - Short press to adjust the cycle
    - 1. 100%
    - 2. 75%
    - 3. 50%
    - 4. 25%
  - Long press to restore default 100%
- Control the mode of RGB light display by pressing button 3
  - Short press to adjust the cycle
  - 1. Mode 1
  - 2. Mode 2
  - 3. Mode 3

Open source code: https://github.com/chensheng12330/SolarOutdoorPortableLamp

 

6. Production and testing

1.Prototyping: Prototype according to design specifications and conduct preliminary functional testing.

2.Performance test: including the test of key indicators such as light intensity, charging efficiency, waterproof and dustproof level.

3.User feedback: Invite target user groups to try out and collect feedback for product optimization.

4.Mass production: Adjust the production process according to the test results to ensure product quality and cost control.

Stitching effect demonstration:

Final product display:

 

7. Marketing

1.Social Media Marketing: Use Instagram, Weibo and other platforms to publish product beauty pictures, tutorials, and user reviews.

2.Outdoor exhibitions: Participate in domestic and foreign outdoor products exhibitions and display products directly to potential customer groups.

3.Partners: Establish cooperative relations with outdoor equipment retailers and travel agencies to expand sales channels.

4.Environmental protection initiative: combined with product characteristics, launch environmental protection public welfare activities to enhance brand image.

 

8. Summary

The design of the solar outdoor portable light aims to combine modern technology and environmental protection concepts to provide outdoor enthusiasts with a high-performance, sustainable and portable lighting solution.