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Circuit for 12V lights to come on each evening.

T

Terryc

Jan 1, 1970
0
discussing projects and some stated that he was having trouble finding
and economical 12V timer and that all the timers he could purchase
required mains supply.

The situation is solar panle charges a SLA battery that runs a few 12V
leds for a porch light each evening.

I redefined it to needing a circuit that responded to ambient light
dropping and then switching on some LED lights for a set period of time,
say 2-4 hours, thus removing any need for a "timer" and Rt syncing/drift.

Has anyone come across such a circuit?
 
H

Harry Pfeifer

Jan 1, 1970
0
A suggestion for a starting point for a light operated control is the solar
powered lights that can be bought for a few dollars for use in a garden.
They come with a LED light at the top, a plastic tube about 400 mm long,
and a spike to stick in the ground. If you get one of these, remove the LED
and extend the connections that were on the LED to connect to the base
circuit of a transistor or FET which connects power to turn on the lights at
night


OldZ80
 
B

Ban

Jan 1, 1970
0
Harry said:
A suggestion for a starting point for a light operated control is the
solar powered lights that can be bought for a few dollars for use in
a garden. They come with a LED light at the top, a plastic tube
about 400 mm long, and a spike to stick in the ground. If you get
one of these, remove the LED and extend the connections that were on
the LED to connect to the base circuit of a transistor or FET which
connects power to turn on the lights at night


OldZ80
But that is completely unnessessary, as he has already a solar panel in his
setup. He could use it as a dawnswitch by measuring the voltage across the
diode feeding the battery, so he would only need a timer for the light to go
off.
ciao Ban
 
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