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Introduction
Who?
Reserved for Daniel Puratich co-op
Context
COTS ELRS PWM Receiver: https://betafpv.com/products/elrs-micro-receiver
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Do the same for all of the requisite pins.
Pull-up/down resistors
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https://learn.sparkfun.com/tutorials/pull-up-resistors/all
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Many of the recommended schematics for this buck IC only added a few barebones capacitors. This would likely be fine, but due to our use case having sensitive RF applications for communication with the fixed-wing plane, as well as the plane having 6 PWM outputs (which could introduce high frequency noise), the additional filtering is welcome.
PCB Layout
Buck Converter
The following are layout guidelines and examples from the TPS56424x buck IC datasheet.
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Basic Guidelines
This board will be 61x30.5mm, with an area of 1860.5mm^2. According to Mounting Hole & Patern Specifications, this makes the board a “medium” size, meaning it will need M2 screw mounting holes. These have 2.40 mm hole diameter and 4.20mm annular ring diameter and will go in the corners of the board. Each hole will need 8 appropriately sized vias equally spaced out. We can add the holes themselves as a pad.
PCB Layers
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Following this 4-layer stackup with no impedance control from JLCPCB, our manufacturer.
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Buck Converter
The following are layout guidelines and examples from the TPS56424x buck IC datasheet.
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Flashing the ESP8285/S1281
https://github.com/crteensy/ELRS-8285-1280-5xPWM
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