MEP EP#242: The Heartbeat of Cats and LEDs

MacroFab Engineering Podcast

English - September 17, 2020 00:27 - 47 minutes - 65.4 MB - ★★★★★ - 34 ratings
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Next Episode: MEP EP#243: Schematics and Connectors, Name a More Iconic Duo...

MEP EP#242: The Heartbeat of Cats and LEDs
Parker

Battery charger and maintainer died

Took all my batteries with it
Company is replacing the unit
Nothing looks particularly wrong with the PCB Assembly besides it being gross
SF1565SG

Current Mode PWM Controller

FQPF12N60C

Fet used in the PWM Controller

HT46R004 HolTek MCU

Cost Effective?

Cat Feeder Unreminder

Ordered a breakout board for the AEM10941
Super Caps SCCS30B106PRB

10F @ 2.7VDC

Solar Panel AM-1816CA

84µA at peak power
This is specced at 200lx

Will this be enough?

LTC2956 draws 0.8μA
LEDs at 40μA a piece
Total draw when Cat Feed Indicator is on is 40.8μA
5F x (4.5V-3.6V) / 0.0000608 = 74,013 seconds -> 20 and a half hours!

Stephen

Magnetics

Transformers arrived!
Be specific with what you ask for and ask questions. I almost got bit with dimensional issues

Diy Tag connect

Made a pogo pin test connector
Mill-Max 0955-0-15-20-71-14-11-0 Pogo pins with solder cup on back
Using FR4 as mechanical supports
Designing a Pawl system to clasp the pcb
Next Revision

Make the landing pads bigger
Add something for strain relief
Move the pins slightly down for more spring
Add more anti rotation pins