PIC relays control

[flipper_md]

Thanks much for the check Adam!

I admit I'm a bit lazy at reading tech stuff, and I kinda trust a lot electonic components, just like mechanical parts
I fear only things when they start to smell weird, burn my fingers or don't light up anymore.
Further more, i'm not skilled at welding so less means better!


I understand I might be hurting the poor PIC now, but I'm just so curious to see how long he will take it that I can't get myself to puts some diodes in.
By caution I measured the peak voltage on my fluke(112), it says 3.3V peak after a couples switch, but is that reliable? The FLuke alone may buffer the voltage?

those tiny processor are heck of fun to play with, it's never ending!

... if I had a girlfriend, she d probably wish to be a PIC 8)

[Kalind]

I need to know how to write the code to switch on/off a relay when a temperature setpoint is reached. The output pin im using is RC1 of a 16f873. Please, someone help me!!

[skimask]

I need to know how to write the code to switch on/off a relay when a temperature setpoint is reached. The output pin im using is RC1 of a 16f873. Please, someone help me!!

main:
if temp > setpoint then
     portc.1 = 1
else
     portc.0 = 0
endif
goto main

You write code by typing at the keyboard.

[earltyso]

I have been using the OMRON G3MB-202PL DC5 solid state relay for my AC christmas lights controller. They only pull ~15mA (input impedance is 440ohms +/- 20%) and work great for switching. The voltage input is 4-6V for on. I drive them directly from my pics and have had no problems. I can tell you that it is a GREAT idea to include fuses in your circuit when you use these if you are planning on large loads 1A+. The best part is that the snubber is built right in the SIP package. They go for 4-5.50 from DIGIKEY part #Z915.

From this forum I learned how to hold the state on or off with a simple counter.
I use this to

main:
if button = 0 then
i = i +1
'blah blah
endif
gosub choice
goto main

choice:
if i.0 = 0 then
high relay1
endif
if i.0 = 1 then
low relay1
endif