Automatic school bell system with configurable schedules and a simplified variant. Built with microcontrollers (Arduino / ESP32) using PlatformIO.
This is what the finished prototype looks like:- https://youtu.be/g8njpu9FO_w?si=gBSwjOJio-1_8WDL
(I'm assuming the person reading this has the basic undertstading of electornics and is comfortable with platform IO and the arduino enviroment)
- Automatic ringing based on configurable schedules.
- Real-time clock (RTC) support for accurate timing.
- Persistent storage of schedules (survives power loss).
- PlatformIO
- Arduino Uno
- RTC module (DS3232)
- Relay: 220 V common / 5 V control
- OLED SSD1306(0,96')
- PlatformIO
- Arduino Uno
- RTC module (DS3232)
- Relay: 220 V common / 5 V control
- SH110X OLED(1,3')
- Push buttons x6
- Passive Buzzer
- 9v battery
- PlatformIO
- ESP32 wroom dev board(Generic)
- RTC module (DS3232)
- Relay: 220 V common / 5 V control
- phone/pc to access device settings
The device has two PCB, one for the main circuits and the other for input buttons. I know an image isn't the best way to share a PCB design so just take mine as a reference when making your's.
After wiring the device the first step is to upload the default settings for the device ( default_settings_Bello.ino for bello and bello mini, and bello-esp-default.ino for bello IOT). What it does is it sets the default class shedules and saves it on EEPROM and also changes the time and date of the device so make sure to change it your preferences. You'll need the Arduino IDE for this one and the DS3232 library installed. make sure not to restart the device before uploading the main code.
You first need to clone this project into your desiered directory. Then open the project from platform IO and build the project, it might take some time when doing it first time. Patform IO automatically downloads all the dependencies for you so it's basicaly plug and play. After building the project you connect the device and ctrl + alt + U to upload the code.
- Bello and Bello mini are straight forward, for bello you have buttons that'll help you navigate the device( mainMenu/OK, UP, DOWN, RIGHT, LEFT). For bello mini there is nothing to do, you just plug it and it just works, no buttons.
- Bello IOT is a bit different. You first need to connect to the device's wifi hotspot (SSID and Password are in the code), then you type out the IPaddress of the device( also in the code but default is 192.168.1.100) on your browser and it'll take you to a webpage where you can modify the settings.
Here's what it look like:
