I want to ask that MT8870 and HT9170 are same or not as their circuits are same. I am not getting HT9170 so can I use MT8870 in place of it( With a Matrix Keypad).
Both are decoders... Where did you intend to connect a keypad and why? I attached both data sheets...
HT9170.pdf (125 KB)
MT8870.pdf (220 KB)
Both are decoders... Where did you intend to connect a keypad and why?
Actually i got a circuit for mobile controlled car so I studied it and I came to know that matrix keypad also produces frequencies equivalent to mobile phone so I thought of replacing mobile phone with Keypad
A matrix keypad is just some switches wired in a special manner... No Electronics, There is a National Semiconductor chip for tone generation and some code available to generate 2 tones at once on an Arduino... But I only know that they exist, I have no direct experience with them.. HTH..