I need a SSR that is normally closed (if my Arduino dies the line should remain closed)
I googled and found this one: LPBD100, but boy is it expensive.. $100+
I assume this is because this is military grade avionics equipment..
? Dual output: two relays in one package
? Normally closed output
250mA, 100Vdc Normally Closed
Any cheaper alternatives?
good idea.. is this solid state?
I will be switching this on and off a lot and I don't want mechanics involved..
my dad uses those...
and sorry i have no idea if that one is ssr...
Long life > 1 billion operations
Why not use a p-chanel MOSFET? Take a look at this link: Microcontroller Interfacing
You can replace the MOSFET in the diagram with a much beefier one if desired.
thanks for the replies.
I like radexito's option best as it seems to be easiest to implement in my case.
Thanks for your comment.
I plan to use the relay to open a circuit and force the current to go thru a resistor in series.
------- NC relay -------
This is an alternative solution with my troublesome idea of emulating the thermistor value (see my post in HW/Interfacing)
It will happen only if i need to raise the temperature (add more resistance to the existing thermistor reading)
The relay will be controlled by Arduino Digital pin