What is a strange spider ?

This spider runs on a Raspberry PI3, attached to the GPIO:




In the specific it uses I2C and Analogic pins.

I2C is used with different peripherals devices setup with different I2C addresses.

Purposes of the I2C devices are 2:


Collect digital inputs:



I will use this board
https://www.abelectronics.co.uk/p/54/io-pi-plus



Control servo motors via PWM:





To power the Raspberry PI there are different ways: https://www.modmypi.com/blog/how-do-i-power-my-raspberry-pi

To avoid to bypass the best way to power the board up, I need to go through the micro usb. With a proper connector. So I can buy a cable at the shop close to home and cut out the "big usb" to have access to the Vcc +5V and GND wires I need. I will connect to a BEC serving 5V at 2Amp current.
A sperated BEC will be required at the same Vcc but higher current as I need it for servos and other loads, that cannot take current from the digital signals pins directly.

Overall design draft will be as per the pen made draw below: