Most, but not all, Solid State Relays (SSRs) are optoisolated; essentially
an opto-isolator with a FET or a transistor output stage. You can get both
AC and DC flavors of SSRs. Digikey has a bunch of pages of these. If an SSR
is rated logic level then you can drive them directly from a PIC pin with a
current limiting resistor. For the Solenoid valve you can just get a N
channel logic level FEt and with a suitable gate resistor drive your
solenoid to ground. For the high amp element you might consider a AC solid
state relay that can be mounted to a panel.
Madhu

>-----Original Message-----
>From: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of rad0
>Sent: Monday, December 22, 2003 5:04 PM
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [ee]: Are solid state relays TTL devices?
>
>
>I was wondering about driving a relay with a pic,
>and then I began to wonder how solid state relays
>are driven?
>
>Are they opto-isolated things that can be turned on
>and off with the pics pins?
>
>If not, is there anything that can be used directly
>on the pics pin to turn on and off house current type things
>or even 12 vdc and 1 or two amps.
>
>One project is a 12 vdc solenoid valve, and the other is a
>high amp element in a water boiler.
>
>Thanks.
>
>I have relays on order.
>
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