Devre Şeması İncelemesi

flux

  • Connected R11:P2 to ^GND
nets {
net PWM_FILT1 = U4:IN +A, C20:P1, R9:P1, R8:P2;
net PWM_BUF = R9:P2, U4:IN -A, U4:OUT A, U4:IN +B, C21:P1;
net AO_DRV = R10:P1, R12:P1, U4:OUT B;
net AO_0_10V = U5:1, R12:P2;
net PLUS5V = R3:P1, C12:P1, C7:P1, C19:P1, J2:Pin_2, C5:P1, IC1:VCC_2, R5:P2, U4:V+, L1:P2, U2:VCC, C4:P1, IC1:VCC_1, C10:P1, L2:P1, C9:P1, U6:IN, U6:EN;
net GND = C9 P2 - C10 P2:GND, GND:GND, R11:P2, C12:P2, IC1 GND_2 - IC1 GND_3:GND, IC1:GND_3, U6 GND - U5 2:GND, IC1:GND_1, IC1:GND_2, C17:P2, U2 EPAD - U4 V-:GND, U2:EPAD, U2:SGND, U6:4, U6:2, C11:P2, U2:RTN, C15:P2, C19:P2, U3 EXP - R1 P2:GND, U3:EXP, U3:ALERT, U3:ADDR, U3:~RESET, C13:P2, C21:P2, C9:P2, C16:P2, U4:V-, C14:P2, J2:Pin_6, U5:2, C18:P2, U3:VSS, C20:P2, R1:P2, C10:P2;
net AO_FB = U4:IN -B, R10:P2, R11:P1;
}

Task completed.

0:23

Checking 6 design areas.
Reading schematic details for R11, U4, U5 and 4 more.

flux

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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ATmega328P 0-10V Temp Humidity Controller

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