Table of Contents
The electronics subsystem was tasked with making all of the electrical systems on the RP1 work together. This includes determining how to power all electronic devices in the system, and how to route all signals/data to their proper locations. The following high level layout was determined to denote the location of all important devices, and the general interaction between them:
Subsystem TeamBryan Jimenez
Three concepts were proposed: Everything except the Motor Controllers (H-Bridges) on the platform, Everything on the platform (including Motor Controllers) or Everything on the Motor Module. The RP10 Redesign team (P08201) used the first option, and as such, the concept selection was labeled as that. The concept selection Pugh diagrams are below:
Bill of Materials
Detailed Bill of Materials (BOM) for the electronics subsystem can be found here.
Final Design Decisions
H-BridgeThe PWM Motor Controller 3A from SuperDroidRobots.com was selected as the best possible H-Bridge choice. This component was tested with the microprocessor and motors with success.
24 volt batteries were chosen since the motors run at 24 volts.
Current Power Distribution Design
Two DC Bucks are required to bring the 24 volt batteries down to 9 volts (for the microprocessor) and 5 volts (for the encoders). The schematics and simulations of them are below. For the simulations, the blue line is the output voltage.
The encoders chosen were from US Digital - The E5 for the drive system, and the EM1 and HUBDISK combination for the steering. The HUBDISK has a mounting ring to fit securely over the cylinder that will be connected to the lower turntable, allowing 1:1 correspondence with the turning angle.
Link to Detailed Design Review, containing information about Electronics Subsystem choices, images of the parts/designs, etc...