Mailbox Delivery Notification Sensor
A mailbox sensor that alerts when mail arrives. The 60x40x25mm battery-powered device uses door switch or light sensor to detect delivery. Sends push notification to phone via WiFi or LoRa. Year-long battery life. No more unnecessary trips to check empty mailbox. This mailbox sensor project is perfect for makers, DIY enthusiasts, and electronics hobbyists. Search volume: 1600/month.
All parts, CAD, wiring, and firmware generated by Modo AI Hardware Builder with human direction.
—Validated fit
—Electrical OK
—Assembly ready
Parts
| Part | Description | Why | MPN | Qty |
|---|---|---|---|---|
| ESP32-C3 Development Kit Espressif Systems |
Main microcontroller with built-in WiFi for wireless notifications and low power consumption for year-long battery life | ESP32-C3-DEVKITM-1-N4X |
1 | |
| Reed Switch Door Sensor DFRobot |
Detects mail delivery by sensing when mailbox door opens/closes - core functionality requirement | MBT0050-AA |
1 | |
| BME280 Environment Sensor Bosch Sensortec |
Motion/vibration sensing for additional mail detection confirmation beyond door switch | BME280 |
1 | |
| Battery Holder MPD (Memory Protection Devices) |
Holds 18650 lithium battery for year-long operation requirement | BK-18650-PC4 |
1 | |
| 3.3V Linear Regulator Shenzhen Slkormicro Semicon Co., Ltd. |
Steps down 3.7V battery to stable 3.3V for ESP32 and sensors | AMS1117-3.3 SOT-223 |
1 | |
| Power Switch C&K |
On/off control for battery power to enable servicing and extend battery life | OS102011MS2QN1 |
1 | |
| Status LED Lite-On Inc. |
Visual indication of device status and connectivity for troubleshooting | LTST-C171GKT |
2 | |
| Mounting Standoffs Würth Elektronik |
Secure compact mounting inside mailbox as required for installation | 970100244 |
4 |
8 unique parts, 12 total components