Start a new project merging several skills in one task. This is my tank track robot controlled by a Raspberry Pi using a webservice. You can control the robot over dynamic website with webcam view. The RSPI also provides RPI-Wireless-Hotspot, so it is possible to connect directly with your smartphone.
An Arduino-Micro communicates to the RSPI over I2C and controls 8 servos. Also a battery state monitor is implemented. I decide to use standard AA Accus for powering with 2 rows a 5x 1,2 volt. A step-up/ step-down switching voltage regulator guaranteed 5 volt supply despite low battery.
See latest video on: https://www.youtube.com/watch?v=D2brukbh378

Updates:
03/12/18: Due to frequent questions: the servo is a MODELCRAFT BMS-410C. You can buy this in Europe at Conrad (https://www.conrad.de/de/modelcraft-standard-servo-bms-410c-analog-servo-getriebe-material-kunststoff-stecksystem-jr-404753.html). The servo is therefore interesting, because he has a receptacle for the axle in the rear housing insinde !

01/04/16: After a long break, I return to the project again. The Raspberry Pi 3B has now integrated Bluetooth and FiFi which means it has more performance and i can remove the "Ampere-eating" WiFi-Stick. Also checking the use of adressable digital servos or selfmade Digital2PWM-Adaptor for serial (BUS) connection. My intention is reducing the amount of cable to the arm.

07/07/15: Project goes on. Currently, the main problem is the power, respectively the duration of the battery power supply. 1 camera, 8 servos, 2 controller, web service, and Wi-Fi hotspot consume a total of 2.5 amperes. Maybe I wanted to solve too much at once :-((
My aim is: Remote-controlled robot with camera. Looking for an alternative video transmission system without web service

02/26/15: Add Tank-Track for 1.75mm Filament rod.

02/05/15: Software implemented. RSP used as WLAN Hotspot with Webserver -> communicates to Arduino over serial - Arduino over I2C to PCA9685. RSPI won't work in Multislave I2C Mode :-((

01/21/15: Fault in the electrical circuit improved. MOSFET got too little voltage on UGS -> reduced resistance

01/20/15: Build new Battery-Pack for more current available. Using 16 x AA รก 6V (4 x 4 pack)

01/19/15: Implements PCA9685. Works fine! First trial without RSP for verfication of trigonometric calculation on Arduino.

01/08/15: First trial completed. Built a experimental arrangement with a old joystick and a second Arduino-Micro which simulates the RSPI-I2C communication (see image). ARGHH! Huge twitching of the servos because Arduino is overloaded with I2C and 8 servos! Special servo driver ordered (Adafruits-PCA9685) to save Arduino-Performance.

01/06/15: Add layout extension board preview. Not checked if all works - release of eagle file after validation by function.

12/28/14: Laser pointer moved to the middle of the gripper - now i can point to the thing i want to grip exactly.
-Change cam to a RSPI-Wide-Angle Cam. In fact this camera is much lighter than the first one!
-Change arm wiring! Because of problems with bending and buckling the wires between the servos i decide to route them on the side which made it necessary to implement the cam to the other side. So add 2 additional cable guides. (see new images)

12/21/14: The chassis is wide enough now.It is not necessary to desolder the cinch video connector.

This is a work-in-progress project and wil bee updated regularly ;-)

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