Embedded v1

Embedded PCB: PT100 Temperature Sensor with SAMD21 Microcontroller

A 4-layer KiCad PCB design integrating a PT100 temperature sensor and SAMD21 microcontroller with LCD interface, developed as a group university project. Includes schematics, PCB layout, firmware, BOM, and full design documentation.

Project overview

The board acquires temperature readings from a PT100 RTD sensor, conditions the signal, and displays real-time output on an LCD. The design was taken from schematic capture through DRC, fabrication, hand assembly, and structured oscilloscope validation against reference measurements.

Repository structure

embedded-pcb-pt100/ │ ├── Embedded_v1.kicad_pcb # PCB layout — 4-layer stack-up ├── Embedded_v1.kicad_sch # Top-level schematic ├── 2_5Vto3.3VRegulator.kicad_sch # Sub-schematic: voltage regulator ├── 3_uC_SAMD21.kicad_sch # Sub-schematic: SAMD21 MCU ├── Embedded_v1.kicad_pro # KiCad project file ├── Embedded_v1.pdf # Full design documentation ├── pt100_temperature_read.ino # Firmware — C/C++ on Arduino framework ├── Sofia Montaguti - BOM - Embedded_v1.xlsx # Bill of materials └── README.md

Design details

• 4-layer stack-up with EMC-aware routing
• PT100 RTD sensor interface with signal conditioning
• SAMD21 microcontroller handling data acquisition and LCD output
• Voltage regulator sub-circuit: 2.5V to 3.3V
• Components soldered by hand
• System validated with oscilloscope and calibrated against reference temperature measurements

Firmware

Written in C/C++ using the Arduino framework. Handles:

• PT100 sensor data acquisition
• Signal conditioning and temperature conversion
• Real-time LCD output

Tools used

• KiCad (schematic capture, PCB layout, DRC)
• Arduino framework (C/C++ firmware)
• Oscilloscope and multimeter for validation