I just got a new Butterfly. I was surprised to discover an additional resistor on the card. It isn't shown on the latest Atmel Butterfly user guide. Well that shouldn't surprise me. The latest user guide still says it has a light sensor.
This new resistor seems to be connected across the light sensor photocell. I should say it would be, if the photocell was present. I guess its purpose is to make the output from the light sensor be more linear. Anyone else care to guess?
I will install a photocell and I think I will remove the new resistor because I want good sensitivity in dim light, and I want minimum current drain on the battery when the light sensor is activated.
P.S. This forum's attachments do a good job with .jpg files but they make .png files look sick. Am I doing something wrong?