Protocar Wiring
The following wiring-schemata is a minimal-modulary-setup! The modularity can further reduced by using a D/A-IC and a GPIO-extention which wasn't a part of this documentation. No warranty for damages caused by mistakes in the following wiring-schemata! Mictroelectronic-foundations are highly recommanded before using powered circuits and wiring microcontrollers!!!
We used an extended wiring-setup by building-up a an own breakout-board and patch-field to have the maximum modularity. We also include three different voltage-cicuits (3.3V, 5V, 9V) to avoid shortcuts and damages of the sensor and other components. To build up an "big" circuit with all Units you have to use the >>>same<<< GND/Ground. Otherwise all transmissions will fail!!!
Figure 1: IoT-Client (RPi3-Device A)
Figure 2: Main-Unit (Arduino Mega 2560)
Figure 3: RPM-Unit (Arduino Uno)
NOTE: A Multifunction-Shield is used in our setup!!! In our case we used the NAIS Pressure Chip ADP42A23.
Figure 4: Triggering-Unit (Arduino Uno)
Figure 5: Stablilization-Unit (RPi3-Device B)
Author: Öznur Öner (Technical Lead @ Center for Personalized Medicine / UKT-University Hospital Tübingen)