Devre Şeması İncelemesi

flux

0:04

Work done
  • Renamed the project to ATmega328P 0-10V Temp Humidity Controller.
  • Verified the main architecture is present and coherent: U1 24 V input, Q1 reverse-polarity protection, D1 TVS clamp, U2 24 V to 5 V buck, U6 3.3 V LDO, IC1 MCU, U3 SHT30 sensor, and U4 with R8, R9, R10, R11, R12, C20, C21 as the PWM-to-0-10 V output stage.
  • Corrected the broken supply/return structure by reconnecting the MCU and analog/output decoupling network onto the explicit PLUS5V and GND rails.
  • Fixed the lower leg of the analog feedback divider by tying R11 to GND, so the second stage around U4 is referenced correctly.
  • Normalized key net naming for traceability, including VIN_24V, PLUS5V, PLUS3V3, VIN_PROT, and the analog output nets.
  • Documented the applied corrections in Design Notes.
Success criteria review
  • ✅ Power path reviewed and corrected so the 24 V input, 5 V rail, and 3.3 V sensor rail are explicitly connected and coherent.
  • ✅ Sensor interface remains correctly structured on 3.3 V with I2C pull-ups on SDA/SCL for U3.
  • ✅ IC1 supply, reset, crystal, AVCC filter, ISP header, and AREF bypass remain in place and connected.
  • ✅ 0-10 V output stage around U4 was corrected so its gain divider now has a valid ground reference.
  • ✅ Final ERC-style checks are clean for floating pins, missing power, undriven nets, and single-pin nets.
Next steps The schematic has been corrected and rebuilt electrically. If you want, I can continue with a tighter pass on component values against the exact reference image or move on to cleaning up the PCB layout and DRC next.
Match reference values
Review PCB DRC
Tighten decoupling
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  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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  • Generic Capacitor
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