Overview
Description
The PM2.5 Monitor is a portable device that can measure and detect the concentration of atmospheric particulate matter (PM) of less than 2.5 micrometers in real-time. The density is displayed on a liquid crystal display (LCD) panel with LED indicators to show the air quality. It also has a charging and power supply function as a mobile battery, and displays battery capacity with four LEDs. If the preset concentration threshold is exceeded or the battery voltage drops below 2.8V, it will inform you with a buzzer.
This solution features the RL78/L12 low-power consumption, compact LCD MCU, which includes functions such as I/O port, A/D converter, buzzer, LCD controller, STOP mode, etc. The device is best suited for small home appliances. In addition, the ISL97656 (DC/DC converter IC) controls battery discharge, and the ISL6294 (battery charger IC) controls charging. The threshold value and PM2.5 concentration data are saved in EEPROM (if the data amount is less than 2KB, you may also use the data flash built in RL78/L12).
Features
- Includes the RL78/L12 MCU.
- Sounds an 80dB buzzer at 1-second intervals when the outside PM2.5 concentration exceeds the preset value.
- Sounds an 80dB buzzer at 2-second intervals when the battery is low.
- Displays charging status using indicator lights:
- When charging, the charge indicator stays on and the battery remaining indicator blinks steadily.
- When charging is complete, the charge indicator turns off and the battery remaining indicator displays normally.
- Shows battery level using four LED lights, each representing a different remaining battery status.
- Improves user experience with clear visual and audible alerts for environmental and power conditions.
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