Configuration 4: Solar or mains rechargeable LED light

Subsystems

Microcontroller

Battery System (rechargeable)

Push-button

Dimmable LED

Indicator LEDs

Approximate build cost

US$13, ZAR195

Operation

The unit is mounted on a ceiling above a work area (or centrally) to give the best illumination from the light.

If a solar panel is used, it must be put on the roof facing upwards (the wire is connected to the bottom of the panel). Glue the panel down securely to prevent wind damage or theft. Make sure that there are as few shadows on the solar panel as possible.

Alternatively, if mains power is available the unit can be powered from a cellphone charger with a micro USB cable.

Press the button on the edge of the unit to turn the light on or off.

When the sun is shining or the unit is plugged in, the battery will charge up so that the light can be used at night.

When the battery is charging a small white light will be lit. A green light will indicate that the battery is fully charged

The light can be used even if the battery is not entirely full. The light is about as bright as ten normal candles. It will typically run for several hours a day even in winter, and more in summer.

When the battery is flat the light will turn off and it may be turned on again after the battery is recharged.