Enhanced measurement module; enhanced schematics

The binaries are for the 512KB flash version only. Download the 0x00000.bin to address 0x00000 and 0x10000.bin to the address 0x10000. The schematics is also attached. The board layout is not finished yet. I've fixed some bugs and changed a the capacitor C1 in the schematics for better power buffering during the HC-SR04 sends the ultrasonic bursts.