12F683 - basic code not working

[LinkMTech]

The output drive is current limited to 25mA meaning an internal resistance of about 200 Ohms at 5V. That's why you see the 2.84V at the pin and nothing close to 5V.



Also, I would think you only need about a 2K Ohm resistor to drive the NPN that has a min. gain of 40 to drive the 80mA relay load.

[Scampy]

LOL - I originally had a 1K base resistor in there and though that was limiting the current / voltage !

The data sheet on the relay does indeed state a current draw of 80ma at 5v - I'll replace the base resistors with 1.5K, being midway between the 1K recommendation and 2K calculated, then follow Henrik's test and I'll report back