Minimal Pico 2 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

0:09

Thought for a moment

I’ll add a minimal Pico 2 shield circuit: inspect the existing Pico header/module, choose a simple humidity sensor, add only required pull-ups/decoupling/power support, wire it, then run checks and fix any issues.

flux

3:08

Thought for 3 sec

Created 5 tasks.

1/5 Inspect the existing Pico 2 shield component pins and project state

Thought for 4 sec

Read schematic.

Thought for 5 sec

Found 3 results for Minimal low-power I2C humidity and temperature sensor for a 3.3V Raspberry Pi Pico 2 shield. Need a common available IC with VDD, GND, SDA, SCL pins and only simple support parts like 100 nF decoupling and I2C pull-up resistors. Prefer SHTC3, SHT30, AHT20, HDC1080, or similar..

Thought for 8 sec

2/5 Select a minimal humidity sensor and required supporting passives

Thought for 3 sec

Read SHTC3-TR-2.5KS datasheet for pin description recommended operating co.

Thought for 4 sec

Found 3 results for Generic Resistor.

Found 3 results for Generic Capacitor.

Thought for 6 sec

3/5 Add the humidity sensor and support components

Thought for 9 sec

Thought for 7 sec

4/5 Wire power, ground, I2C, pull-ups, and decoupling

Thought for 3 sec

Thought for 2 sec

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

Thought for 5 sec

Completed design checks — found 54 issues.

Read schematic.

Thought for 10 sec

Thought for 4 sec

Thought for a moment

The SHTC3 circuit is wired. I found expected template-style floating pins on the unused Pico header pins, so I’m marking intentionally unused pins and documenting the minimal power/current assumptions next.

flux

3:10

Thought for 9 sec

Thought for 6 sec

Completed design checks — found 16 issues.

Thought for 13 sec

Thought for 13 sec

Completed design checks — found 14 issues.

Thought for 6 sec

Completed design checks — found 14 issues.

Thought for 10 sec

Thought for 4 sec

Completed design checks — found 11 issues.

Thought for 6 sec

5/5 tasks completed.

Thought for a moment

Added a minimal SHTC3 humidity sensor circuit: U2 on Pico GP4/GP5 I2C, 10kΩ pull-ups, 100nF local decoupling, all Pico grounds tied, and unused shield pins marked no-connect. ERC and manufacturing checks are clean; remaining airwires are expected until you approve layout/routing.
I also documented the design and power budget in Minimal Pico 2 Humidity Shield Notes.
Proceed to layout
Place sensor edge
Check BOM cost
Use GP0 GP1
Add test points

Finished working

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Minimal Pico 2 Humidity Shield Notes
Scope
Add the minimum required circuitry for a Raspberry Pi Pico 2 shield with one primary humidity peripheral. The design intentionally avoids extra regulators, level shifters, LEDs, buttons, and external connectors because the Pico 2 module already provides USB power regulation and a 3.3 V rail.
Selected Peripheral
  • U2: Sensirion SHTC3-TR-2.5KS
  • Function: I2C humidity and temperature sensor
  • Supply: 1.62 V to 3.6 V; powered from Pico 2 3V3
  • I2C address: 0x70
  • Interface pins used: SDA and SCL

Pico 2 Pin Mapping

Pico 2 PinNetFunction
GPIO4I2C0_SDAI2C data to SHTC3 SDA
GPIO5I2C0_SCLI2C clock to SHTC3 SCL
3V33V3Sensor supply and I2C pull-up rail
GND / AGND pinsGNDCommon return path
VBUSVBUSExposed Pico USB 5 V net; not used by this shield circuit

Required Supporting Components

DesignatorValuePurpose
C1100 nFLocal SHTC3 VDD/VSS decoupling, placed close to U2
R110 kΩI2C SDA pull-up to 3V3
R210 kΩI2C SCL pull-up to 3V3
Power Budget
The shield adds only the SHTC3 sensor and I2C pull-ups to the Pico 2 3.3 V rail.

Table

LoadTypicalPeak / Max Used for Sizing
SHTC3 idle45 µA70 µA
SHTC3 measurement normal mode430 µA900 µA
I2C pull-upsNormally ~0 A staticMomentary sink current only during low bits
Worst-case sensor current used for this minimal shield: 900 µA on 3V3 during measurement. This is negligible relative to the Pico 2 onboard 3.3 V rail capability, so no additional regulator is required.
Datasheet-Grounded Wiring
The SHTC3 datasheet requires:
  • VDD connected to a valid 1.62 V to 3.6 V rail
  • VSS connected to ground
  • 100 nF capacitor between VDD and VSS placed close to the sensor
  • External pull-up resistors on SDA and SCL, example value 10 kΩ
  • Exposed center pad internally connected to VSS; connected to GND here
Intentional Omissions
  • No added regulator: the Pico 2 module supplies 3V3.
  • No USB-C or barrel connector: the Pico 2 module already has USB power input.
  • No level shifter: both Pico 2 GPIO and SHTC3 operate at 3.3 V logic.
  • Unused Pico header pins are intentionally marked no-connect for this minimal shield design.

    Scope

    Selected Peripheral

    Pico 2 Pin Mapping

    Required Supporting Components

    Power Budget

    Datasheet-Grounded Wiring

    Intentional Omissions

Documents

    Minimal Pico 2 Humidity Shield Notes

Assets

pico-template.png

pico-template.png

pico-templateThumbnail

Raspberry Pi Pico 2 Shield Template 3dFF

Raspberry Pi Pico 2 Shield Template 3dFF 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

$1.73–$1.73

Digi-Key

$1.18–$1.36

HQonline

$0.01

LCSC

$0.01

Mouser

$0.30

TME

$6.10

Verical

$1.65–$72.03

Controls