my current project is Boiler temperature controler.
PCB Shield description
* 7xDS18B20 (if i will use sensor indexing than i can connect much more sensors)
* 7x digial Outpout (12-24V DC)
* 6xdigital inputs (12-24VDC) or SPI LCD. If I2C lcd is used, than are these inpust available.
* and pinheader for i2c device (with 5 pins, 2 are data, one is GND aaand 5V and 3V3
Curently i am using 4 sensors. and COM1 is conntected with bluetooth UART adapter to conenct with PC, what is now for upload parameters. These parameters are saved to I2C eeprom. I am using RTC DS1307 Shield with build in eeprom. On i2C bus i have next devices - 2x LM75 (temp sensor). One is for Indoor temperature and the second is for outdoor temperature. Picture show you 4 relais to switch valves.
Thats all for now :-).