Window Open Reminder Sensor

A window position monitor with HVAC integration. Magnetic sensor detects open/closed state, sends alert if window left open while heating/cooling running. The 50x30x15mm case mounts on window frame. Battery powered 12+ months. Prevents energy waste and high utility bills. This window 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

ESP32-S3 Wireless MCU

Espressif Systems
ESP32-S3compute
Why: Main microcontroller for data processing, monthly logging, and EPA risk level calculations. Built-in ADC for sensor interfacing.

BME280 Environmental Sensor

Bosch Sensortec
BME280sensing
Why: Provides temperature and humidity measurements to complement radon monitoring for comprehensive environmental assessment.

OLED Display Module

Orient Display
AOM12864A0-0.96WWuser_input
Why: Visual display for EPA risk levels with color-coded status indication and radon concentration readings.

RGB Status LED

XINGLIGHT
XL-5050RGBC-WS2812Buser_input
Why: Color-coded visual indicators for EPA radon risk levels (green=low, yellow=moderate, red=high).

3.3V LDO Regulator

Shenzhen Slkormicro Semicon Co., Ltd.
AMS1117-3.3 SOT-223power_regulation
Why: Voltage regulation for stable 3.3V supply to all system components from battery power.

18650 Battery Holder

MPD (Memory Protection Devices)
BK-18650-PC4power_regulation
Why: Battery power source for portable, long-term radon monitoring operation.

Power Switch

C&K
OS102011MS2QN1power_regulation
Why: On/off control for battery powered operation and power management.

Battery Charger IC

Microchip Technology
MCP73831T-2ACI/OTpower_regulation
Why: Enables convenient recharging of 18650 battery for continuous long-term monitoring.

8 unique parts, 10 total components.