I’m not very good with electronics and I’m not sure I understand your documentation. Can you tell me if the following is possible?
I want to combine
- a relay shield (seeedstudio.com/depot/relay- … th=132_134)
- a 16x2 LCD (seeedstudio.com/depot/lcd-82 … th=163_164)
- a number pad (sparkfun.com/products/8653)
- a humidity & temp sensor (sparkfun.com/products/8257)
- possibly one other sensor
- possibly a real-time clock (sparkfun.com/products/99)
for home automation. Can I do it all with a duemilanova? I guess I would need one transformer for 5V and one for 9V. Can anyone confirm this?