Device Activation
Hi,
Thanks for the link but I'm not using the phone transformer and audio in/audio out as part of my circuit. I'm using the TIP and RING connected to the DTMF decoder MT8870 which then feeds to the brain, the PIC18F458. From here i don't know what to do in order to activate/de-activate the external electrical device. Like count 4 rings and then open the line for the user...then wat?
Could i use like a non-volatile EEPROM memory module to store a valid 4-digit combination to be used as the user ID that wants to access the electrical device? Then, once a valid cose is entered, a correct sequence must be entered like *1# to turn the device on and a *2# to turn it off?
The only problem with this, if this can work, is that how would the person know if he/she was successful in activating/de-activating the device desired...A beep tone is usually used to indicate to the user that his/her code sequence was correct. How do i implement this beep tone verification for the user wishing to activate/de-activate the electrical device using the PIC as the main device for control?