Re: Add a two way switch to this circuit


On 2008-07-10, saurabh9 <saurabh9@xxxxxxxxx> wrote:
On Jul 10, 1:22 pm, Rheilly Phoull <rhei...@xxxxxxxxxxxx> wrote:
saurabh9 wrote:
Hi,
Please have a look at the circuit at:
http://www.glacialwanderer.com/_blog/blog2008/04_April/hb_relay5.jpg.
It is from the article athttp://www.glacialwanderer.com/hobbyrobotics/?p=9.

Wire a switch across the collector to ground.

Thanks for your response,
Will that ensure that if the bulb was turned on by the microprocessor,
then
i can manually turn it off and vice versa?

no with the switch wired like that to turn off the bulb you'd have to cut the 5v power.


otherwise you need a three way switch.
cut the wire to the collector

arrange it so the one position has the that connection broken - (this is override off)
another has that connection made (this is microcontroller control)
and the third has the relay connected to ground (this is override on )
the third position can have the cut connection either made or broken

another option (if you have an on-off-on switch and want the middle
position to be microcontroller control) is to have one of the on's
ground the base and the other ground the collector.

Bye.
Jasen
.

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