Features

• A cheap very simple solar lamp. Can be 3D printed, or built in a glass jar.
• Automatically switch on/of the light when night/day comes
• Solar
• Can be switched off manualy, and used as a torch
• Printable circuit board (KiCad), can easily be done on perfboard too.

Pictures

Components

Name	Quantity	Description
QX5252	1	https://datasheetspdf.com/pdf/719492/Qxmd/QX5252/1
AAA_holder	1	AAA battery holder
Solar_panel	1	60x60 mm, 5V
5mm LED	1	20mA LED
330uH	1	Inductance DIP (1)
Switch	1	20mm, toggle, on/off (2)
5mm LED support	1	RTM5021

(1) Inductance values control the currant going trough the LED, according to this table. The default value is 330 uH. Lower inductince will increase light brightness and decrease battery duration.

Inductance (uH)	Current (mA)
330	11
270	14.5
220	15.5
150	25
100	34.5
82	38
56	50
47	75
33	110

(2) The switch is mounted in series with the LED

Circuit

License

This project is licensed under the LGPL-v3 license.