The Amp Hour
An Interview with Jason Cerundolo
1 tim 10 min•20 mars 2017
Om avsnittet
- Jason is currently an engineer at CastAR, who now have 100+ people! They work out of a space called Playground Global, who were also their lead investor in their A round.
- Jason's side projects are done under a brand called Reclaimer Labs.
- He also sells some of his projects on his Tindie store.
- Jason did a talk about LED drivers at an SF meetup a few months ago. (slides are here)
- The "Internet Window" has 25000 LEDs. Which apparently isn't that hard, even at a resolution of 128 x 64 LEDs. At a 3 mm pitch on the LEDs, the display is roughly 1 x 2 ft wide.
- Most of his projects are connected via a Particle Photon.
- The LEDs draw 5V at 16A in a normal state (with PWM). The incoming power is at 24V.
- The "Internet of Thermocouples" was a weekend project to help his friend not have to go check the temperature on an induction over every couple hours.
- Lately Jason has been prolifically posting about USB C. His latest project is building an easy bake oven.
- The cables are "Electronically marked" and come in varying qualities online. There is a Google engineer who reviews USB C cables on amazon.
- Some of the high level capabilities of USB C we learned:
- The Super speed pins can do video
- It's possible to easily deliver 15W (3A at 5V).
- The default is USB 2 high speed.
- The max speed of data is 10 Gbps x 4 lanes = 40 Gbps throughput.
- Power delivery communication
- USB developers page and download the zip files
- VESA runs the display port spec.
- Jason ported a library, which ended up being over 4000 lines of code. Google has open source code that was the basis of this project.
- They troubleshoot with a Lecroy T2C USB analyzer.
- The defaults don't really need much:
- One extra resistor to use USB C without a PHY
- 5V @ 500 mA - USB 2 high speed
- Can watch that pin to see if it's offering .5, 1.5 or 3 A
- Alternate modes
- Follow Jason on twitter as @AscendedDaniel. Check out his blog and projects at ReclaimerLabs.com. You can also follow his code on GitHub.
- They're hiring at CastAR! Firmware, EE, others
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