Microchip ATSAMD21G18A
Beginner-Friendly Arduino Home Alert Board
Overview
A beginner-friendly, breadboard-friendly Arduino-compatible development board featuring an RGB LED, buzzer, and rechargeable LiPo battery power for simple home automation and sensor alerts.
Abhinandan WaliaSystem architecture
MCU
POWER
ACTUATOR
- POWER → MCUPowerProvides regulated 3.3V supply power to the microcontroller and onboard peripherals
- MCU → ACTUATOR_RGBGPIOSingle-wire digital data control line for addressable RGB LED
- MCU → ACTUATOR_BUZZERPWMPWM output signal driving the N-Channel MOSFET to control the passive buzzer
- POWER → MCUUSBNative USB connection for power input, Arduino IDE upload, and UF2 bootloader
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| ATSAMD21G18A-AU | MCU | Microchip ATSAMD21G18A Main processing unit, runs Arduino sketches, handles USB communication and peripheral control | MICROCHIP | TQFP-48 | 1 | Matched | |
12 alternatives consideredAI verified | |||||||
| MCP73831T-2ACI/OT | POWER | MCP73831 LiPo Battery Charger and Voltage Regulator Manages USB charging for rechargeable LiPo battery and regulates power for the system | MICROCHIP | SOT-23-5 | 1 | Matched | |
17 alternatives consideredAI verified | |||||||
| WS2812C-2020-V1 | ACTUATOR | Worldsemi WS2812B-2020 Provides visual indicators and status alerts for charging, battery level, and user code | WORLDSEMI CO.,LIMITED | 2020 | 1 | Matched | |
19 alternatives consideredAI verified | |||||||
| SI2302CDS-T1-GE3 | ACTUATOR | CUI Devices CMI-1206S-85T with AO3400A MOSFET Provides audio feedback, startup sounds, and warning alarms via PWM drive | Vishay Siliconix | SOT-23-3 | 1 | Matched | |
13 alternatives consideredAI verified | |||||||
Build guide
3-5 hoursBeginner
1
Procurement & Preparation
- Procure all BOM components including ATSAMD21G18A-AU MCU, MCP73831T-2ACI/OT charger, WS2812C-2020-V1 RGB LED, SI2302CDS-T1-GE3 MOSFET, CUI Devices CMI-1206S-85T buzzer, passive components (resistors, capacitors, 0805/0603 decoupling caps), USB Type-C connector, 3.7V LiPo battery, and custom two-layer PCBs.
- Prepare the SMT stencil, clean the bare PCB pads with isopropyl alcohol, and secure the PCB on the stencil alignment table.
2
Hardware Assembly & Wiring
- Apply lead-free Type 4 solder paste across all exposed SMT pads using a squeegee blade at a 45-degree angle.
- Place all surface-mount components (ATSAMD21G18A-AU, MCP73831, WS2812C-2020 RGB LED, AO3400A/SI2302 MOSFET, CMI-1206S-85T buzzer, and passives) onto their designated pads using a pick-and-place machine or precision tweezers under a microscope.
- Run the populated PCB through a reflow soldering oven following the SAC305 temperature profile (preheat to 150-180°C, peak temperature 240-245°C).
- Manually solder through-hole header pins for breadboard compatibility along the perimeter of the board using a controlled soldering iron.
3
Firmware Setup
- Install the Arduino IDE and add the Adafruit SAMD Board package via the Board Manager to support the ATSAMD21G18A architecture.
- Connect the board to the computer via USB Type-C, put the MCU into bootloader mode by double-pressing the reset button, and verify the virtual COM port appears.
- Flash the initial test firmware implementing FastLED/Adafruit_NeoPixel routines for the WS2812B-2020 LED, analogWrite tone control for the buzzer via the AO3400A MOSFET, and USB enumeration.
4
Testing & Calibration
- Perform an automated optical inspection (AOI) or visual inspection under magnification to check for solder bridges, cold joints, or tombstoning passives.
- Plug in a 3.7V LiPo battery and connect USB power to test the MCP73831 charging circuit, verifying that the charging status indicator (WS2812B) transitions properly from charging to full charge.
- Execute the full diagnostic test sketch verifying RGB LED color cycles, buzzer audio frequency output via PWM/MOSFET, and stable USB serial communication.
Document
beginner-friendly Arduino-compatible board
A beginner-friendly, breadboard-friendly Arduino-compatible development board featuring an RGB LED, buzzer, and rechargeable LiPo battery power for simple home automation and sensor alerts.
Design Overview
| Item | Details |
|---|---|
| Product Type | beginner-friendly Arduino-compatible board |
| Key Functions | Arduino-compatible microcontroller architecture, Onboard RGB LED for visual indicators and alerts, Onboard buzzer for audio alerts, Rechargeable LiPo battery power with integrated charging circuit |
| Power Source | Rechargeable LiPo Battery with USB charging |
| Connectivity | |
| Size | Compact breadboard-friendly DIP footprint |
| Environment | indoor |
| Difficulty | Beginner |
| Est. Time | 3-5 hours |
System Architecture
Power Topology: USB 5V (VBUS) powers the MCP73831 LiPo charger circuit to safely charge the connected rechargeable LiPo battery. The system and MCU are powered by a regulated 3.3V rail derived from the power path.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| MCU | MCU | Microchip ATSAMD21G18A | Main processing unit, runs Arduino sketches, handles USB communication and peripheral control | 3.3V |
| POWER | POWER | MCP73831 LiPo Battery Charger and Voltage Regulator | Manages USB charging for rechargeable LiPo battery and regulates power for the system | 5V/3.3V |
| ACTUATOR_RGB | ACTUATOR | Worldsemi WS2812B-2020 | Provides visual indicators and status alerts for charging, battery level, and user code | 3.3V |
| ACTUATOR_BUZZER | ACTUATOR | CUI Devices CMI-1206S-85T with AO3400A MOSFET | Provides audio feedback, startup sounds, and warning alarms via PWM drive | 3.3V |
Key Components
4/4 modules matched to real parts. See the BOM tab for the full component table.
Microchip ATSAMD21G18A (ATSAMD21G18A-AU)
Candidate 1 (ATSAMD21G18A-AU) is an exact match for the searched part number and module specifications.
MCP73831 LiPo Battery Charger and Voltage Regulator (MCP73831T-2ACI/OT)
Candidate 1 matches the exact part number MCP73831T-2ACI/OT and its specifications as a linear Li-Ion/Li-Polymer battery
Build Summary
- Difficulty: Beginner
- Estimated time: 3-5 hours
- Tools required: SMT Stencil, Squeegee blade, Pick-and-place machine or ESD tweezers, Reflow oven, Soldering iron, Stereo microscope
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: Design a beginner-friendly Arduino-compatible board with RGB LED and buzzer