Raspberry Pi, servo motor, gpio, i2c and soldering weekend

This weekend I decided to work on my soldering skills and finally assemble the PWM driver PCA9685 I bought from Adafruit couple weeks back. Not all solder points looks perfect, but I’ve manage not to burn the PCB which I consider a major success. I thank all the
guys how put soldering tutorials on the youtube!

DSCN1556

Then I played with software.
* I2C: I used python to steer servo controller via I2C interface. For some reason the Raspbian image has I2C kernel module disabled, so I had to comment blacklist i2c-bcm2708 in /etc/modprobe.d/raspi-blacklist.conf and the add i2c-dev and i2c-bcm2708 to /etc/modprobe to enable them to start.
* GPIO: Raspbian has all libraries loaded by default for GPIO development in python. I had encountered hardware problem instead – there’re many sources on the web describing pin layout of GPIO port, but non of them says which pin is the physical pin 1! I have some gaps in basic knowledge, so I have missed a small rectangle marking P1 – it’s the one nearest to the side of the board in bottom row. See a picture with pins P3, P5, P9, P10 and P11 connected:
DSCN1563

And here it is – Raspberry Pi waving The Flag of the United States of America

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