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 PIC 16F84A DTMF Repeater (Remote) Controller



RPC2 - A

Basic Features:

1. Uses MT8870

2. Screw type Output Terminals

3. May be powered from terminals or 2.1mm Jack

This PIC16F84a based repeater (DTMF) controller is very simple & economical to build. It also gives you hand-on experience of using & programming PIC Micro controllers. Controller measures 10cm X 6 CM and may be housed in your repeater project enclosure

Controller here is based on a design idea from Dave Robinson/WW2R who has provided necessary software & hardware information on this controller.

Design of this Controller is based on MT8870 DTMF receiver, a Microchip 16F84A Micro-Controller and an ULN2803A relay driver .

Controller has 8 OC outputs to drive 8 relays. Outputs are available at 12pin header socket or screw-in terminal blocj where a ribbon cable may be connected. In addition to 8 OC outputs, header/terminal socket also provides 12V, Ground & 5V (for pull-ups only).

Controller is without relays & is designed to be accommodated within an existing project, where DTMF control is required. It will drive 5/12V relays of any type, without problems.

Firmware for PIC is available here for download in .ASM file with password 1234 which may be changed at the time of programming the PIC. This firmware was tested & controller worked perfectly without missing any command.

Another version of Firmware which is supposed to "remember" last status of relay after a power failure, is also available but I have not tested it yet. 


Picture of the Completed DTMF Repeater Controller:

Click the picture to enlarge

 Technical information and Schematic:

RPC2A DTMF Repeater Controller

Not Ready Yet

Schematic & Parts List

Schematic  JPG
RPC2A Kit Parts List
 PIC Controller Software & PW Change Guide
RPC2A Gerber Files
Password Change Guide
PIC 16F84A Firmware (.ASM) & Includes No-PW Hex
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RPC2A Kit 36.00

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Kit Packing List


2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.



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