Hardware design of the OHMC2022 Rockling & Swag Badge and OHMC close
summary
Hardware shows the Rockling badge design choices, what was reused, and what actually worked: the analog front end is stole analog front end from Gowdy Labs and plugs into an FPGA-based signal chain; audio uses a PJRC Teensy codec and amp that test standalone; power rails implement required FPGA sequencing; initial assembly yields a surprising 50% failure rate caused by 180°-rotated crystal oscillators; antenna prototypes (coax, copper pipe, magnet wire) work enough for demos; new tooling like IceStudio IDE makes FPGA blinky rapid and accessible.
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chapters (27)
- 0:00Intro
- 3:38Professional Consulting
- 3:58Party Button
- 4:19Swag Badge
- 5:16Design Notes
- 6:12Rockling Badge
- 8:03Schematic
- 9:15Design Philosophy
- 11:54FPGA
- 12:04Stealing
- 12:54Audio Block
- 13:20Amplifier Block
- 13:47Testing
- 14:31Power Block
- 15:23PCB design
- 15:38Functional blocks
- 16:09Design principles
- 17:16Interactive Board Tool
- 18:07Antennas
- 18:33Antenna Prop
- 19:26Antenna Ideas
- 20:34Extension Lead
- 20:45Graphical Schematic Capture
- 24:10Whats missing
- 24:45Call to Arms
- 24:56Conclusion
- 26:52Failure rate
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