Temperature and Humidity Sensor Node Design

flux

0:00

Work completed
  • Decoupling capacitor C1: set to 100 nF, connected between U2 VCC and GND within 5 mm
  • Decoupling capacitor C2: set to 100 nF, connected between U2 AVCC and GND within 5 mm
  • Bulk capacitor C3: set to 10 µF, connected between U2 VCC and GND within 5 mm
  • Pull-up resistor R1: set to 10 kΩ, connected between U2 RESET and VCC
  • Protected 5 V entry circuit: oriented D1, TVS, and PTC with TVS breakdown > 5.25 V
  • Sabertooth headers: J2 Pin 1→U2 PD5, J3 Pin 1→U2 PD6; Pin 2 of each to GND
  • Encoder connectors: removed incorrect GND ties; J4 Pin 1→U2 PC4, Pin 3→U2 PC5, Pin 2→GND; J5 Pin 1→U2 PD2, Pin 3→U2 PD3, Pin 2→GND
  • AREF decoupling capacitor C4: 100 nF, connected between U2 AREF and GND within 5 mm
  • Pull-up resistors R2 and R3: each 10 kΩ, applied to ENC1_A and ENC1_B
  • ERC review passed with no errors and added to project property ERC_Review
  • Project properties set: Lock Net Names = true; Ground Pour Convention = “Pour ground on layers L2 and L3 with thermal spokes”; Initial Placement Approach = “Auto-Layout placement”
Success criteria review
  • ✅ All power, reset, and signal nets correctly connected with decoupling and bulk caps as specified
  • ✅ Sabertooth and encoder connectors properly mapped, no erroneous GND ties
  • ✅ ERC passed with no errors; schematic approved for PCB layout ground pour and placement
Next step Proceed to the PCB editor to apply ground pour on layers L2/L3 and run Auto-Layout placement of components.
160 days
certy

certy

why is J1 not connected
160 days

flux

1:48

Accessing knowledge base.

Analyzing the schematic.

Analyzing the schematic.

Short answer: J1 is the in-circuit programming header placeholder, but it hasn’t been wired to the ATmega’s ISP signals yet.
Details:
  • J1 is a 6-pin single-row header marked “ICSP,” but no nets are assigned to its pins in the schematic.
  • To make it functional, it must be connected to U2 as follows (AVR ISP 6-pin mapping):
    • Pin 1 → U2: PB4 (MISO)
    • Pin 2 → VCC
    • Pin 3 → U2: PB5 (SCK)
    • Pin 4 → U2: PB3 (MOSI)
    • Pin 5 → U2: RESET/PC6 (and keep R1 10 kΩ pull-up to VCC)
    • Pin 6 → GND
Optionally, we can swap J1 to the standard keyed 2x3 AVR ISP footprint for tooling compatibility: 2x3 Pin Header.
Want me to wire J1 per the mapping above and, if you prefer, replace it with a keyed 2x3 header?
Header wiring help
Search keyed ISP header
Replace J1 footprint
Confirm mapping nets
160 days
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U1 PC6_(~RESET~/PCINT14) - R1 P1
D1 K - PTC P2
TVS 3 - TVS 4
U1 PC6_(~RESET~/PCINT14) - R1 P1
J3 1 - U2 PD6
R2 P2 - R3 P2
D1 K - PTC P2
D1 A - PTC P1
U2 PD3 - J5 Pin_3
C3 P2 - GND GND
U2 PD3 - J5 Pin_3
C3 P2 - GND GND
U1 PD2_(INT0/PCINT18) - J5 Pin_1
D1 A - PTC P1
TVS 3 - TVS 4
D1 K - PTC P2
J2 1 - U2 PD5
U1 GND_1 - C1 P2
D1 K - PTC P2
C3 P2 - GND GND
R2 P2 - R3 P2
C3 P2 - GND GND
U1 (PCINT19/OC2B/INT1)_PD3 - J5 Pin_3
U1 PC5_(ADC5/SCL/PCINT13) - J4 Pin_3
U1 PD2_(INT0/PCINT18) - J5 Pin_1
C3 P2 - GND GND
U2 PD2 - J5 Pin_1
C3 P2 - GND GND
U1 PC4_(ADC4/SDA/PCINT12) - J4 Pin_1
U2 PD2 - J5 Pin_1
U1 PC5_(ADC5/SCL/PCINT13) - J4 Pin_3
R2
Resistance
10kΩ
C4
Capacitance
Capacitance
C3
Capacitance
10uF
R2
Resistance
500 Ω
C1
Capacitance
100nF
C2
Capacitance
100nF
R3
Resistance
10kΩ
R1
Resistance
10kΩ
GND
J5
TVS
D1
PTC
J2
J3
J4
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • 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
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.7k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M
Relative Harlequin Robot Vacuum thumbnail
ATmega328P Dual Sabertooth Motor Controller Interface with Encoder Feedback and Protected 5V Input (KiCad 9, Compact Design)

Properties

mm
mm
mm
mm

Pricing & Availability

Distributor

Qty 1

Arrow

$2.51–$3.22

Digi-Key

$3.32–$4.10

LCSC

$2.93

Mouser

$4.23

TME

$6.06

Verical

$1.99–$148.97

Assets

Assets are files uploaded to this project which can be used in various ways.

Controls