Light Sensor Project

[Simon Griffiths]

Dear All,
I am about to add the basic electronics to my project which
consists of two light sensor circuit boards - one for dark, the other for
light. I have wired both to a motor and thus this operates the motor forward
and reverse. My question is how do I stop both circuits coming on at the
same time and shorting the motor/battery? I was advised that a latching
relay would do this but am still unsure about this? Any help is really
appreciated - I'm a bit of a thickie when electronics are involved. Thanks.

Simon.

 

[andy]

Dear All,
I am about to add the basic electronics to my project which
consists of two light sensor circuit boards - one for dark, the other for
light. I have wired both to a motor and thus this operates the motor forward
and reverse. My question is how do I stop both circuits coming on at the
same time and shorting the motor/battery? I was advised that a latching
relay would do this but am still unsure about this? Any help is really
appreciated - I'm a bit of a thickie when electronics are involved. Thanks.

Simon.

why do you need two light sensor circuits? couldn't you just have one and
invert the output to make the other? Or else just have one and use it to
drive a relay, which crosses the motor drive cables over the other way
round when the light goes dark? i.e. the power is always on, but just
switch it the opposite way round for reverse. Then you just have to make
sure the relay is a 'break before make' type.

not sure what your project is though, so this may not make sense.