Minimal Pico 2 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

0:08

Thought for 4 sec

Thought for a moment

I’ll keep this minimal: inspect the Pico 2 shield pins, select one simple I2C humidity sensor plus only required pull-ups/decoupling/power connections, wire it, then run checks and fix any issues.

flux

4:03

Thought for 6 sec

Created 5 tasks.

1/5 Inspect the existing Pico 2 shield symbol pins and current schematic state

Thought for 6 sec

Read schematic.

Thought for 3 sec

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

Thought for 2 sec

Found 1 results for SHTC3 I2C humidity temperature sensor.

Thought for 6 sec

Read SHTC3-TR-2.5KS datasheet for pin description.

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

Read SHTC3-TR-2.5KS datasheet for typical application circuit.

Read SHTC3-TR-2.5KS datasheet for power supply decoupling capacitor.

Read SHTC3-TR-2.5KS datasheet for I2C pull-up resistors.

Found 5 results for Generic Resistor.

Found 5 results for Generic Capacitor.

Thought for 9 sec

3/5 Add the sensor, I2C pull-ups, and decoupling capacitor

Thought for 8 sec

Thought for 12 sec

4/5 Wire power, ground, I2C, and support components to the Pico 2 shield

Thought for 6 sec

Thought for 11 sec

Thought for a moment

5/5 Run schematic review and fix real ERC issues

Thought for 4 sec

Completed design checks — found 47 issues.

Read schematic.

Thought for 14 sec

Thought for a moment

The sensor circuit is wired. Review found only unused Pico header pins floating plus VBUS not used on this minimal shield, so I’m marking those intentionally unconnected and re-checking.

flux

1:03

Thought for 4 sec

Thought for 1 sec

Completed design checks — found 16 issues.

Thought for 16 sec

Found 4 results for Generic 2 pin header connector 2.54mm.

Thought for a moment

VBUS is modeled as a required power input, so I’m adding one simple 2-pin 5V/GND power header rather than adding USB-C circuitry. This keeps the shield minimal and gives the Pico a defined power source in the schematic.

flux

2:54

Thought for 3 sec

Thought for 7 sec

Thought for 3 sec

Thought for 2 sec

Completed design checks — found 15 issues.

Thought for 19 sec

Thought for 14 sec

Thought for 24 sec

Thought for 4 sec

5/5 tasks completed.

Thought for a moment

Done — I added a minimal Pico 2 humidity-sensor shield circuit: SHTC3 sensor, 10kΩ I2C pull-ups, 100nF local decoupling, GND/3V3/I2C wiring, and a simple 2-pin 5V/GND VBUS input header.
Validation passed: electrical review now reports no ERROR/WARNING/UNCERTAIN ERC checks. I also saved the design notes and power budget in Minimal Pico 2 Humidity Sensor Shield Design Notes.
Move to layout
Place components
Check BOM
Add firmware notes
Use 4.7k pullups

Finished working

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Minimal Pico 2 Humidity Sensor Shield Design Notes
Scope
Minimal schematic additions for a Raspberry Pi Pico 2 shield:
  • One Sensirion SHTC3 I2C humidity/temperature sensor.
  • Required SHTC3 support components only: SDA/SCL pull-ups and local VDD decoupling.
  • One simple 2-pin 5V/GND input header to satisfy the Pico 2 VBUS power input in the schematic.
Datasheet-grounded SHTC3 requirements
Source: Sensirion SHTC3 datasheet.
  • Supply voltage VDD: 1.62 V to 3.6 V; operated from Pico 2 3V3.
  • Pins: VDD, SCL, SDA, VSS; center/EPAD internally connected to VSS and may be connected to GND.
  • Decoupling: 100 nF capacitor between VDD and VSS, placed close to the sensor.
  • I2C: external pull-up resistors required on SDA and SCL; datasheet example RP = 10 kΩ.
  • I2C clock: supports 0 to 1 MHz Fast Mode Plus.

Power budget

RailLoadTypicalPeak
3V3SHTC3 average normal mode, 1 measurement/s4.9 uA-
3V3SHTC3 measurement normal mode430 uA900 uA
Added shield sensor load on Pico 3V3: 900 uA peak. The 3V3 and VBUS net metadata use 0.001 A max current for this added load. Pico 2 board current itself depends on firmware and is supplied through the VBUS header or onboard Pico USB power path.
Connections
  • U2 SHTC3 VDD -> 3V3.
  • U2 SHTC3 VSS and EPAD -> GND.
  • C1 100 nF -> between 3V3 and GND near U2.
  • U2 SDA -> U1 GPIO4 / I2C_SDA, with R1 10 kΩ pull-up to 3V3.
  • U2 SCL -> U1 GPIO5 / I2C_SCL, with R2 10 kΩ pull-up to 3V3.
  • J1 Pin_1 -> VBUS, J1 Pin_2 -> GND.
Validation
Electrical review after wiring and no-connect marking reports no ERROR, WARNING, or UNCERTAIN ERC checks matching the validation filter.

    Scope

    Datasheet-grounded SHTC3 requirements

    Power budget

    Connections

    Validation

Documents

    Minimal Pico 2 Humidity Sensor Shield Design Notes

Assets

pico-template.png

pico-template.png

pico-templateThumbnail

Raspberry Pi Pico 2 Shield Template 9stM

Raspberry Pi Pico 2 Shield Template 9stM 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

$1.71

Digi-Key

$1.16

TME

$6.10

Verical

$1.64–$1.89

Controls