Volvo 850 T5 and Ardic auto heater remote control using a GSM phone (2000)

The PCB contains a

Here is photo session of the device.

PCB manufacturing

The PCB is machine milled.

The manufacturing plant.

Surface mounted devices (SMD) turned out to be very convenient. Much less drilling holes.

Top side.

The relay had to be added later. The original opto-isolator was not enough to switch on the car heater.

Bottom.

Preparing the Nokia 1611 GSM phone

I wanted to have a connector to It does have them all. However, all I use at the moment is the buzzer, power monitor and power. The rest is there to enable using the phone as a remote burgler alarm, a robot phone.

The separate keypad is very convenient for construction.

A bunch of thin wire-wrap wire is very bulky even in this "bulky" phone. This photo shows the connection to the earpeace and buzzer. Notice, that the keypad PCB is fully functional on this side even though several wires are connected to it.

 

This is the hard way to connect the wires. I wanted the phone to be neat, so there had to be a connector. Just drilling a hole to suitable places in the housing would have been much easier.

But it is neat.

Taking the antenna to an external BNC connector.

The box

From left to right: car connector (MIL), GSM antenna (BNC) and red LED (RCA).

The PCB and GSM are connected with connectors, so they can easily be taken out.

Notice again, that all the keys are functional (except the power key, that has to be operated with a screw driver).

Preparing the car

Here are some pictures of the preparation of the Volvo 850 T5 STW.

I will add a couple of pictures of the fitting to the trunk and the location of the GSM antenna.


2001-12-07