Minimal Pico 2 Humidity Sensor Design

amirkat

amirkat

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.

flux

0:06

Thought for a moment

I’ll turn this Pico 2 shield template into a minimal working humidity-sensor shield: first I’ll inspect the existing Pico header part, then select a simple I2C humidity sensor and only the required support parts, wire power/I2C/decoupling, and run checks.

flux

1:30

Thought for 5 sec

Thought for 3 sec

Created 5 tasks.

1/5 Inspect existing Pico 2 shield pins and available nets

Thought for 6 sec

Read schematic.

Thought for 3 sec

2/5 Select a minimal I2C humidity sensor and confirm datasheet wiring requirements

Thought for 4 sec

Found 3 results for SHTC3.

Found 6 results for SHT31-DIS.

Thought for 3 sec

Read SHTC3-TR-2.5KS datasheet for pin description VDD VSS SDA SCL ADDR rec.

Read SHTC3-TR-2.5KS datasheet for recommended operating conditions supply .

Read SHTC3-TR-2.5KS datasheet for I2C address ADDR pin configuration.

Thought for 4 sec

Found 5 results for Generic Resistor.

Found 5 results for Generic Capacitor.

Thought for a moment

I found the Pico 2 shield exposes 3V3/GND and GPIO pins, so I’m using the Pico’s onboard 3.3 V rail—no extra regulator is needed. I selected an SHTC3 I2C humidity/temperature sensor; its datasheet requires only a 100 nF decoupling capacitor and SDA/SCL pull-ups.

flux

4:42

Thought for 2 sec

3/5 Add humidity sensor plus only required passives

Thought for 6 sec

Thought for 5 sec

4/5 Wire 3V3, GND, I2C SDA/SCL, pull-ups, and decoupling

Thought for 5 sec

Thought for 4 sec

5/5 Validate schematic with review and fix real ERC issues

Thought for 3 sec

Completed design checks — found 53 issues.

Read schematic.

Thought for 9 sec

Thought for 3 sec

Thought for 6 sec

Completed design checks — found 14 issues.

Found 3 results for RC0603FR-0710KL 10k 1% 0603 resistor Yageo.

Found 1 results for GRM188R71E104KA01D 100nF 25V X7R 0603 capacitor Murata.

Thought for 11 sec

Thought for 7 sec

Thought for 2 sec

Completed design checks — found 10 issues.

Thought for 8 sec

Completed design checks — found 10 issues.

Thought for 19 sec

Thought for 11 sec

Thought for 21 sec

Thought for 5 sec

Completed design checks — found 9 issues.

Thought for 3 sec

5/5 tasks completed.

Thought for a moment

Done — I added the minimal SHTC3 humidity/temperature sensor circuit for the Pico 2 shield: SHTC3 on I2C0 using GPIO0/GPIO1, 10 kΩ SDA/SCL pull-ups, and a 100 nF local decoupling capacitor on 3V3. Schematic ERC/manufacturing/passive checks are clean; full review still shows PCB airwires because layout/routing has not been done yet.
I also recorded the design rationale in Minimal Pico 2 Humidity Shield Notes. The next step is layout placement for the new sensor and passives, then routing.
Proceed to layout
Use compact placement
Prioritize sensor exposure
Add firmware notes
Review BOM

Finished working

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Minimal Pico 2 Humidity Shield Notes
Scope
Add the minimum required schematic components for a Raspberry Pi Pico 2 shield to support one humidity sensor peripheral.
Selected peripheral
  • Sensor: Sensirion SHTC3-TR-2.5KS humidity and temperature sensor
  • Interface: I2C Fast Mode Plus capable
  • I2C address: 0x70
  • Supply range: 1.62 V to 3.6 V
  • Typical/maximum measurement current from datasheet: 430 uA typical, 900 uA maximum in normal measurement mode
Power approach
The shield uses the Pico 2 3V3 pin as the sensor rail. No additional regulator is required because the SHTC3 operates from 1.62 V to 3.6 V and the sensor load is under 1 mA peak.
Schematic connections
  • U2 SHTC3 VDD -> 3V3
  • U2 SHTC3 VSS and EPAD -> GND
  • U2 SHTC3 SDA -> Pico GPIO0 / I2C0_SDA
  • U2 SHTC3 SCL -> Pico GPIO1 / I2C0_SCL
  • C1 100 nF -> between 3V3 and GND close to U2
  • R1 10 kOhm -> SDA pull-up to 3V3
  • R2 10 kOhm -> SCL pull-up to 3V3
Supporting components
  • C1: 100 nF, 25 V, 0603 ceramic decoupling capacitor; selected MPN GRM188R71E104KA01D
  • R1/R2: 10 kOhm, 1%, 0603 pull-up resistors; selected MPN RC0603FR-0710KL
Validation notes
The schematic-level ERC and manufacturing checks are clean after wiring and adding passive MPN metadata. Full project review still reports PCB airwires because the new schematic nets have not been placed/routed on the PCB yet; this is expected until the user approves moving from schematic to layout.

    Scope

    Selected peripheral

    Power approach

    Schematic connections

    Supporting components

    Validation notes

Documents

    Minimal Pico 2 Humidity Shield Notes

Assets

pico-template.png

pico-template.png

pico-templateThumbnail

Raspberry Pi Pico 2 Shield Template oPL8

Raspberry Pi Pico 2 Shield Template oPL8 thumbnail
This is the project template for the Raspberry Pi Pico 2, the latest addition and update to Pi Pico line up.
Raspberry pi pico 2 is equipped with the RP2350, a cutting-edge, high-performance microcontroller designed with enhanced security and versatility in mind. Every element of its design has been upgraded, from the advanced CPU cores to the innovative PIO (Programmable I/O) interfacing subsystem.
The Raspberry Pi Foundation has integrated a robust security architecture centered around Arm TrustZone for Cortex-M, ensuring data protection and integrity. Additionally, new low-power states and expanded package options broaden the range of applications, making the Pico 2 an ideal choice for diverse, power-sensitive projects.
To learn more about what's the key differences between the original Pi Pico and the new Pi Pico 2, read our blog https://www.flux.ai/p/blog/whats-new-in-the-raspberry-pi-pico-2-a-showdown-with-the-original-raspberry-pi-pico
#project-template #template #raspberry #pi #pico2 #newpico

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$1.72–$1.72

Digi-Key

$1.18–$1.36

HQonline

$0.01

LCSC

$0.01

Mouser

$0.30

TME

$6.10

Verical

$1.64–$72.02

Controls