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Solar-Powered Night Light with Li-ion Backup

Solar-Powered Night Light with Li-ion Backup
This night light has two power sources: a solar cell with a peak output voltage of about 6 V, and a Li-Ion cell with a voltage between 3.7 V and 4.2 V. Three (of four) electronic switches in a 74HC4066N (IC1) control the device operation. The battery charging rate as well as the intensity of the LEDs may be adjusted.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
COMPONENT LIST
Resistors
R1,R4,R5 = 100kOhm 1% 0.25W
R2 = 330Ohm 1% 0.25W
R3 = 62Ohm 1% 0.25W
R6 = 120Ohm 1% 0.25W
Semiconductors
D1,D2,D3 = 1N4148
D4 = 1N4731A zener diode (4.3V)
D5 = LED, 5mm, color of choice
D6 = LED, red, 5mm
IC1 = 74HC4066
Miscellaneous
S1 = toggle switch, Newark/Farnell # 1310879
PCB # 130178-1
Connectors marked SC6V and LI-ION 4.2V = PCB terminal block, lead pitch 5mm

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