Where can I find a file on the pinout of the I/O connector on the Raspberry Pi 1 model B?
A quick Google would have answered your question.
An intro to the Raspberry Pi GPIO can be found here: https://www.raspberrypi.org/documentation/usage/gpio/README.md
There's a good reference at the RasPi Hardware Wiki: http://elinux.org/RPi_Low-level_peripherals
Here is a great tutorial with picture http://makezine.com/projects/tutorial-raspberry-pi-gpio-pins-and-python/
Retrieving data ...