Temperature and Humidity Sensor Node Design

flux

Work Completed
  • Project description and system architecture updated
  • Removed legacy power and level-shifter ICs: U2, U3, U7
  • Added and configured major ICs:
    • U8 (5 V eFuse with OVP/UVLO)
    • U9 (3.3 V synchronous buck)
    • U10 (74AHCT125 SPI up-shift buffer)
    • U11 (74LVC1G125 MISO down-shift buffer)
  • Added passive support:
    • Bulk capacitors on rails: C6, C7
    • Decoupling capacitors near ICs: C8, C9, C10, C11, C12
    • Series resistors on SPI: R5, R6, R7
    • Pull-up resistors on SPI: R8, R9, R10, R11
  • Connected major nets:
    • U8 IN→J1:VBUS, OUT→5 V rail
    • U9 VIN→5 V rail, VOUT→3.3 V rail
    • U6 VDD→5 V rail
Remaining Tasks
  • Complete net connections for passives:
    • Tie [C6]–[C12] to appropriate rails
    • Route SPI up/down-shifters ([U10], [U11], plus R5–R7 series) and pull-ups
  • Review schematic for correct connectivity and decoupling placement
  • Prepare PCB layout:
    • Set 4-layer stackup
    • Define net classes (power, SPI, I2S, I2C, ADC-hiZ)
    • Create antenna and noisy-return keepout zones
  • Establish layout rules (trace widths, impedance, clearances)
Success Criteria Status
  • Power tree ICs and decoupling: ✅ major devices added; passive connections pending
  • SPI interface: ✅ robust buffers and series resistors in place; routing pending
  • PCB layout preparation: ⏳ not yet configured
Next Step Continue with detailed net wiring for capacitors and level-shifter passives, then perform a schematic review before moving on to PCB stackup and net-class definition.

Flux stopped

  • Generic Inductor
    Generic Inductor
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  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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    RMCF0805JT47K0
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Yearling Apricot Translation Collar

Yearling Apricot Translation Collar thumbnail
USB-C Powered Arduino Nano ESP32 Soil Monitor with Protected 5 V Rail, Integrated eFuse (OVP/UVLO), 3.3 V Synchronous Buck, SPI Level Shifting, and Optimized 4-Layer Layout

Properties

U

USB C

Arduino

creativecommons.org/licenses/by/4.0/

Display

WiFi

Agriculture

5

V

5

USB

USB_C_VBUS --> EFuse_OVP_UVLO --> V5_Rail --> V3_3_Buck --> V3_3_Rail; V5_Rail --> MAX98357A; ESP32_Nano -->|I2C| OLED, AHT20; ESP32_Nano -->|I2S| MAX98357A; ESP32_Nano -->|SPI| A74AHCT125 --> B74LVC1G125 --> MicroSD; ESP32_Nano -->|ADC| RC_Filter --> Soil_Sensor

Pricing & Availability

Distributor

Qty 1

Arrow

$21.99–$23.82

Digi-Key

$25.34–$26.39

LCSC

$34.99–$35.16

Mouser

$30.39

TME

$2.29

Verical

$23.66–$33.28

Controls