12F629 LDR - Light Dependant Resistor

[mtripoli]

You don't really mean "-5V" in the schematic... call it "ground" or something... else we see the little gears in the IC come flying out...

Mike Tripoli

[Dennis]

Hehehe
Speed kills hey ?
Well that would make 10V the supply then :-) and without a regulator mmm could prove interesting ;-)

Mike ..thanks a million for catching that one in time :-)
Yes it definitely must be GND not -5v as in the schematic :-)
Will see if I can replace the schematic :-0

Keep well

Kind regards
Dennis

[Dennis]

Here it is .. the schematic corrected to show +5V and GND rails :-)

Kind regards
Dennis

[BobK]

Hi Dennis,

So you have an LDR and a pot and a 1 k resistor across the supply rails. Isn't this combination suppose to connect to an input on the micro? I mean how else is the micro suppose to sense a change then turn the LED on?
Just an observation!

BobK

Nice program example though!

[Bruce]

Wiper on POT to GPIO.2..?

[grounded]

forgive just trying to understand what your doing here.
instead of using the LDR as a A/D input (which the 29 does not have)
when the amount of light causes the voltage to over come the the pull down resistor you get a high input on gpio.2 ?
am I close?

[Dennis]

Hi all

Apologies for the confusion .. I had left an important line out of the schematic in my rush to share.

All is fixed now !! The new corrected schematic is attached.

I don't know how those bad schematics got here ..HUMAN HUMAN HUMAN.. grrr!

@BobK .. well we could have been trying a current limiter or 'floating points' ;-)
Valid chirp though was laughing like mad at myself for forgetting a track in schematic and spot on it should connect somewhere for the PIC to be of any use ...!

@grounded , damn right... build it , and see the magic ;-), works like a charm!

@Bruce GPIO.2 conects right between the 10K potentiometer and the LDR

Build it build it build it !

Kind regards
Dennis