MEP EP#242: The Heartbeat of Cats and LEDs

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