Aquarium Auto Controller using PIC18F4520

  
The AquaCont is an electronic system witch permits to manage and to monitor most of the parameters of all the electrics devices that can be found in a aquarium. The PIC18F4520 used to realize it, combines a real time clock and a temperature sensor in order to control 8 relays. The LCD display permits to monitor the current date and time, the temperature detected by the sensor and moreover it permits to visualize each port status in the last row. In the following LCD screens display it is possible to program the weekly timer events, set the temperature sensor parameters and manage the serial connection with a PC where is running the included WinTimer software.
Aquarium Auto Controller using PIC18F4520 - schematic

The power supply needed by the main board is 5V, while the relays board requires 12V; the different source power was useful in granting the protection of the microcontroller and his circuits from overvoltage and short circuit on the 220V. Two optocouplers are utilized for that purpose ensuring the isolation of the different voltages. The weekly timers are programmed basing on the clock provided by the proper integrated circuit supplied with a lithium battery. The timers data are memorized in the micro's eeprom. The RS232 serial port allows to simply program the micro using the corresponding PC software; the functions provided in the PC software are also included in the firmware, except for the PC clock syncing. Using the Pc software is also possible to assign a description, to each of the 8 relays ports that will be memorized in the additional LC2416 eeprom memory. In this memory will be also stored the temperature sensor's settings data. The mikroC language is known for its large functions library and for its good development board so it was used for developing the AquaCont firmware. In fact the first AquaCont prototype was developed using the MikroElektronika's EasyPIC4 and two breadboards. Please note that the firmware's source code can be recompiled only using a registered version of MikroC compiler, while the freeware version limits its output to 2K program words. The system main characteristics are: time /...



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