DTMF 9 tone generator help

Thread Starter

liquidforce

Joined Aug 16, 2018
2
Looking to create a device that answers a call and then pushes 9 to trigger my gate opening. The recording of the 9 tone no longer works after the call box was upgraded. I've seen some video on youtube about circuit boards that can be built but I have little experience with something like this. I think I could assemble the parts but wold be lost without an LCD interface walking me thru how to program something to answer after 4 rings then press the 9 tone. Any advice or parts to consider looking in to? this video seemed to be in the right direction
 

Thread Starter

liquidforce

Joined Aug 16, 2018
2
I think I understand the dual tone and there are plenty of ways to generate the frequency/ sound either by a digital file or a generator. Maybe the solution is to automate it somehow so the phone line picks up then 9 is somehow pressed. I think there is a solution but no so little about circuit boards or how to program something.
 
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