![]() ![]() Digikey ( is an excellent source for electronic components. The programmer I use came from a company called Micro Engineer Labs, Inc at The only other parts needed are the electronic components, as shown in the schematic in step 3, Circuit Details. I have seen instructions on this site for building your own, but I cannot speak for any of them. You will need a programmer for PIC microprocessors. I have included the *.hex file needed to program the microprocessor, 12F683_DTMF_DECODE_01A.HEX. Sorry for any inconveniene caused for those who may have tried the original code. The HEX file attached now works properly. UPDATE! : The HEX file for progdramming that I originally attached to this instructable had a bug that prevented successful programing of the tone sequence, unless the microprocessor was in serial output mode while in programming mode. I have created a new step (Step 9) containing the *.asm file, along with some important notes. UPDATE! : Due to requests for the source code, I have attached it. If the programmed string is detected in the audio applied the audio input, the output will turn on (go high), and can be used to control other circuitry of the users design. The completed program allows the processor to be programmed with a string of DTMF tones to detect. This project contains the details of using a Microchip PIC12F683 8 bit microprocessor to detect DTMF tones. ![]()
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