week 7

Week 7

this week, I started do my preparation for my presentation in week 10. I gathered my information about my project. but not many information that fulfill my want. I'm still not understand about DTMF until lastly I found out about DTMF. That is DTMF explanation. many information I get just explained the DTMF using but not about DTMF function and how its work. when I get the explanation, I started do my research. between GSM and DTMF where is easy. I look when we used GSM, we had to used DTMF also. DTMF also easy to understanding because it just used decoder to control it. whereas GSM I don't know much because it was just communication system unlike DTMF that used decoder and programming to functioned. DTMF also has link with keypad already, so it goes without programming keypad on micro-controller. Micro-controller just link with DTMF and relay but power supply also come from micro-controller. I think, I just used ULN2003 array because I just do a devices for 3 or 4. where ULN2003 can support 7 devices on relay. and for micro-controller, I used 8051 because, in micro-controller classes I used this IC for learning outcome.