Hello - just getting up to speed on the Photon and have a project objective. I want to control an old school door access device currently wired as a wired phone interrupter DTMF receiver. i.e. phone rings, you push a digit to open the door.
Any suggestions on how to either program the Photon to generate DTMF signals or a compatible shield etc?
End objective is device that taks phone line off hook, generates a series of DTMF tones on phone line, and puts phone back on hook after short delay.