This Automatic Packet Reporting System (APRS) Weather Station project built based on PIC16F877. It comes with humidity sensor (Honeywell HIH-3610), Pressure sensor (Motorola MPXA4115), thermo meter (DS1621), RTC (For time Stamp) with battery back-up. The project uses 4×20 LCD to display all weather parameters, but you can still operate it without LCD for power saving.
Dinesh Gajjar, project designer, explains that you can connect the device with 1Wire Wind instrument from AAG too. This weather station can transmit APRS Weather Data at 1200baud.