Minimal Pi Pico 2 Humidity Sensor Design
Add the minimum required components needed for this Pi Pico 2 to function properly. Keep the design as simple and minimal as possible.
You may include a single humidity sensor as the primary peripheral, along with any essential supporting components such as power regulation, pull-up resistors, decoupling capacitors, or required connectors.
Thought for 3 sec
I’ll build a minimal Pico 2 shield schematic: inspect the template pins, choose a simple humidity sensor, add only required power/I2C support parts, wire everything, then run checks and fix any schematic issues.
Worked for 58 sec
I selected the Sensirion SHTC3 because it runs directly from the Pico 2’s 3.3 V rail and only needs I2C pull-ups plus one 100 nF bypass capacitor, so no extra regulator is required.
Worked for 4 mins 40 sec
Done — I added the minimal SHTC3 humidity/temperature sensor circuit with only R1/R2 10kΩ I2C pull-ups and C1 100nF decoupling, wired to Pico 2 GPIO4/GPIO5 and 3V3/GND. ERC now returns no unresolved categories.
I also created:
Next step is PCB layout placement; I’ll wait for your confirmation before moving into layout.
Start PCB layout
Place sensor near edge
Keep shield compact
Check BOM cost
Add test points
Refine this doc
Ask about this doc
Minimal Pico 2 Humidity Shield Notes
Summary
This shield keeps the Raspberry Pi Pico 2 design minimal by using the Pico 2 module/header as the power and MCU platform, adding only one Sensirion SHTC3 humidity/temperature sensor and the support parts required by the SHTC3 datasheet.
Added Components
Table
| Designator | Part | Purpose |
|---|---|---|
| U2 | Sensirion SHTC3-TR-2.5KS | I2C humidity and temperature sensor, address 0x70 |
| R1 | 10kΩ resistor | I2C0 SDA pull-up to 3V3 |
| R2 | 10kΩ resistor | I2C0 SCL pull-up to 3V3 |
| C1 | 100nF ceramic capacitor | SHTC3 VDD-to-VSS decoupling |
Datasheet-Grounded SHTC3 Requirements
- Supply range: 1.62 V to 3.6 V; powered from Pico 2 3V3.
- I2C address: 0x70.
- Required local decoupling: 100 nF between VDD and VSS, placed close to the sensor.
- I2C requires external pull-up resistors; the SHTC3 datasheet gives 10kΩ as an example value.
- EPAD is internally connected to VSS/GND and is tied to GND in this schematic.
Net Assignments
Table
| Net | Connections | Notes |
|---|---|---|
| 3V3 | U1:3V3, U2:VDD, R1:P2, R2:P2, C1:P1 | Pico 2 3.3 V rail powers the sensor and pull-ups |
| GND | Pico ground pins, U2:VSS, U2:EPAD, C1:P2 | Common return path |
| I2C0_SDA | U1:GPIO4, U2:SDA, R1:P1 | Pico I2C0 SDA |
| I2C0_SCL | U1:GPIO5, U2:SCL, R2:P1 | Pico I2C0 SCL |
| VBUS | U1:VBUS | Named exposed Pico USB VBUS rail; not used by the sensor circuit |
Power Budget
Only the SHTC3 is added as a downstream load on 3V3. Datasheet maximum measurement current is 900 µA, so the added sensor load is under 1 mA. No additional regulator is required because the Pico 2 already provides 3V3.
Validation
Electrical rule checking was re-run after wiring and no ERC categories were returned. Unused Pico 2 shield pins were explicitly marked as intentionally unconnected to keep the minimal design clear.
Summary
Added Components
Datasheet-Grounded SHTC3 Requirements
Net Assignments
Power Budget
Validation
