USB-C Temperature and Humidity Sensor Node
can you connet all grounds in the schematic
Thought for 54 sec
Done — I connected the schematic ground-related pins to the common GND net.
Connected to GND now:
- J1:2
- J2:2
- U1:GND
- U2:GND
- C1:P2, C2:P2, C3:P2, C4:P2
- R2:P1
- D1:A
- U1 unused inputs: 3A, 4A, 5A, 6A
- TP4 ground test point
I also verified the GND net afterward; it now includes the expected connector, regulator, logic IC, capacitor, pull-down, diode, and unused-input ground connections.
Connect all grounds
Use common GND
Run ERC after
Handle shield grounds
Thought for 1 sec
- Connected J1:2, J2:2, U1:GND, U2:GND, C1:P2, C2:P2, C3:P2, C4:P2, R2:P1, D1:A, U1:3A, U1:4A, U1:5A, U1:6A, TP4: to ^GND
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Design Notes
PDT20A BeagleBone THT Pulse Interface
Final architecture
- Input connector: J1 through-hole BNC
- Input protection: D1 = 1N4148 through-hole diode
- Input damping: R3 = 33 ohm axial resistor
- Pulse conditioning: U1 = SN74HC14N PDIP-14, powered from 3.3 V
- Output connector: J2 through-hole 1x4 2.54 mm header
- Local regulation: U2 = MCP1700-3302E/TO with C1, C2 on input and C3, C4 on output/logic supply
Signal flow
- J1 pulse input -> R3 -> U1 gate 1 input
- D1 clamps the pulse input node to ground for negative excursion protection
- U1 gate 1 output feeds U1 gate 2 input
- U1 gate 2 output drives the BeagleBone pulse output on J2 pin 3
Power flow
- J2 pin 1 provides 5 V input
- U2 regulates 5 V to 3.3 V
- C1 = 10 uF bulk input capacitor
- C2 = 100 nF input bypass capacitor
- C3 = 1 uF regulator output capacitor
- C4 = 100 nF logic decoupling capacitor for U1
Layout intent
- Board size: 70 mm x 70 mm
- Stackup: Standard 2 Layer
- Pulse path kept on top layer and as short/direct as possible
- Power conditioning grouped near the BeagleBone-side connector
- Through-hole parts spaced generously for hand soldering
Current implementation note
- Unused 74HC14 gates are tied to ground so the DIP package remains well-defined in a hand-built board.
PDT20A BeagleBone THT Pulse Interface
Final architecture
Signal flow
Power flow
Layout intent
Current implementation note
