Welcome to the Second part of how to build a simple Cell phone to Cell phone Remote Control any thing from 1 to 8 Relay Channels.

Now if you would like to see the finished unit working I have fixed a lamp to channel one you will see the phone flash as I have turned the ringer off and soon after the lamp will switch on you will see a green LED come on as well.

Now if you want a PSTN 8 channel remote control to work with your Land Line click here.

Here you can see how to solder the two wires to the Plug solder one red wire to the bottom of the socket and solder the black wire to the top contact of the socket see photo below do this with both sockets.

When you have done your two sockets connect the red wire to the + on the Auto input and connect the black wire to the Ground, Earth on the pin next to it.

With your second socket connect the red wire to the + on the DTMF decoder unit and connect your black wire to the pin next to it Ground Earth.

Now when you use the Nokia 1208 Mobile phone this will work with a two pin mono jack plug solder a red wire to the middle contact red and solder a black wire to the ground earth of the jack socket do this with the 3.5mm & 2.5mm jack plugs see photo below.

1). Now I am going to use 8 relays for this project you can use any thing from 1 to 8 if you like I have also given my own CAD Schematic Diagram on how to set the relays up to the main DTMF unit.

2). Now as Jim has all ready done a PDF file for his DTMF the Power and Audio connections I don't need to add photos here but I have done my own CAD Schematic Diagram to show you how you can connect the relays in a number of different ways.

3). Now in the photo below I have taken a snap shop of the DTMF unit this is very simple to follow as Jim has Marked the connections on his DTMF unit.

4). I have designed a number of different ways this DTMF unit can be connected to a relay some with no LED and some with LEDs and more.

5). I have also shown in my Schematic diagram how to add more relays for more channels with or with out LEDs.

The Schematic below is how to connect the relays and more.

Now I have designed a simple Polarity Protection Switch that will protect your DTMF unit if you connect it up wrong with the power supply click on the photo below.

Please all so note the DTMF unit will work with or with out this switch this is just to add a little more protection.

Now if you would like to see the simple Opposite Polarity Protection Switch working then visit my You Tube page here..

6). When you get every thing connected up we will now look at how we can send a DTMF code to the unit to turn on the relays you want see below.

7). Please note I have only tested this unit with a Nokia 1208 Mobile phone as the receiving phone and the unit works every time with this phone.

8). You will need to look in your own phones manual to see how to set up Auto Answer for your model of phone.

9). I often use a Nokia 3310 or my Samsung D500 Mobile phone to send my DTMF tones how this works is I phone my Nokia 1208 mobile with the DTMF unit fixed to it and listen for the ring tones to stop this is about 4 rings.

10).Then I key in the channel I want to turn on or off by using the codes below.

Now the following information below is how to operate the unit.