Who does not know the problem, during soldering very small packages on a PCB, sometimes it would be nice to have a closer look.
A microscope or a macro camera would be nice. Of cause one could take a picture with a digital camera and look at it on the screen. Other people have also microscopes for this purpose.
But how nice would it be to have a big resolution picture on the computer screen which also updates quickly if for example moving the object under observation? A macro video camera would be awesome.
After reading the article on the Raspberry Pi blog  about how to use the Raspberry Pi camera as a macro camera I thought this is exactly what I need. Since I have two of these cameras lying around I thought it is worth a try.
In order to change the focus of the Raspberry Pi camera one needs to move the lens, which can break the camera.
By screwing out the the lens one changes from the fixed focus, which is sharp from around 70 cm to infinity, to a focus which is sharp under short distances.
And it works extremely good.
With the Raspberry Pi camera one can make pictures with a resolution of 2592×1944 and get videos with Full HD resolution 1920x1080p.
This shows already quite some details on the screen.
Since I don’t want to directly connect a screen to the Raspberry Pi I stream the video to my work computer and watch the video there.
This can be easily done by two commands:
On the Raspberry Pi
sudo raspivid -o - -w 1920 -h 1080 -rot 180 -b 5000000 -fps 5 -t 10000000 | nc.traditional -l -p 5000
and on the computer
nc.traditional 192.168.1.127 5000 | mplayer -fps 60 -cache 1024 -
Looking on a 0805 SMD resistor, no problem to read the value.
Also in order to examine a IC package for solder bridges, one sees enough details:
The whole setup looks like this:
I have mounted in front of the camera, after putting the lens in macro position, a second lens.
This lens I bought on EBAY, and it is a wide angle mobile phone lens.
With this lens I can come even closer to the object, even if this lens is not made for this purpose, but it changes the focal point a second time. Pictures get even bigger.