Gold Mini GSM Intercom: production, testing, inspection

Finally we saw our new Mini Intercom enter production.  It uses a new and novel manufacturing technique which required several iterations to get right.  The end result is a solid, strong lump of fiber glass with a pretty black and gold finish – and yes that’s real gold!  At just 4mm thick this intercom has the appearance of a flush mounted unit but is in fact surface mounted; a common trait for all our Gold intercoms.

4mm thick intercom

Side view

The intercom is fully waterproof. We use the gold finish as it is non-corrosive.  The three parts of the intercom are brazed together forming a water tight seal around the unit rather like a copper pipe is soldered to form a seal.

soldering joint x-ray

Solder seal x-ray

After the soldering process we inspect the intercom using an x-ray to ensure the seal has been formed around the entire perimeter of the unit.

QFN x-ray

Processor soldering inspection


Honeywell Accenta/Optima GSM Dialler SMS Sender – Set and Unset Alarm Remotely

Our C4 for Honeywell Accenta & Optima alarms allows you to remotely set and unset your alarm from anywhere in the world.  It will dial, text and email you when the alarm is triggered and armed and disarmed.

New Firmware Testing

Firmware debugging

v6 Firmware Testing

We’re currently testing the new v6 firmware which offers email support along with:

DTMF tones during calls
Event Logging
Daily health check connection to our server
Email support
Email of balance
Reset logs for monitor errors
Compressed firmware allowing new features
Can include the analogue voltages on customised messages
Event Scheduling (Relay On/Off)
On-board RTC

All looking good for shipping w/c 27/02/17!

Gold Mini Intercom Sneak Preview

I thought I’d share this even though it’s not ready to order yet.  We have a new intercom measuring 10cm x 8cm x 0.5cm.  It actually can be 4mm thick but the rear seal adds 1mm for external applications.  This also makes the audio a little nicer.  We screwed it to a white box for the photo!

GSM Door Phone Intercom

GSM Door Phone Intercom

Due to be available mid-January 2017

C4 GSM Gate and Roller Shutter Control PCB Wiring

C4 Mobile Phone Shutter Controller

The shutter can be opened and closed by calling the SIM card number or sending a SMS text to the SIM card number.  The setup and wiring depends on the configuration of your shutter control panel.

Gate or Garage Door with one ‘Open’ terminal

GSM Roller Shutter Controller

Simple Open Input Controller

For gates and garage door openers with just one ‘open’ connection just the # terminals are used.  Connections are made from the COM# terminal and NO~ terminal.

The following commands are used (sent in a SMS to the SIM card number):

Master <your number>.           …sets your phone up as with admin rights

Add <number>.                       …adds more numbers to the system

Open                                       …open and closes the gate/door

Latch                                       …holds the door/gate open until ‘OPEN’ or ‘OFF#’ sent


Gate or Garage Door with Open and Close Terminals

Phone SMS controller gate roller shutter

C4 to Controller with both Open and Close Terminals

For gates, roller shutters and garage doors with an open and a close terminal the second relay is used.  This allows the GSM unit to close the entry also.


The following commands are used (sent in a SMS to the SIM card number):

Master <your number>.           …sets your phone up as with admin rights

Add <number>.                       …adds more numbers to the system

Channel alt                             …allows first call to open shutter, second call to close it

Open                                       …opens the gate/door

Close                                       …closes the gate/door


Rlymode ring                           …activates output relays whilst phone is ringing

Rlytime xxx.                              …sets the relay output pulse time to xxx seconds


Open/Close send give a pulsed relay output set by the RLYTIME command.  ON*/OFF* and ON#/OFF# activate and deactivate the relay permanently.  Calling the device will operate the relay set by the CHANNEL command (default is #).  CHANNEL ALT will allow one call to operate the # relay and the next to operate the * relay – usefull for opening and closing the shutter.  To operate the shutter only whilst the phone is ringing the RLYMODE RING command is sent.  RLYMODE PULSE return this to the default pulse setting.

The C4 Gate and Rolller Shutter GSM Phone Control PCB is available on our website on the following link C4 Mobile Phone Shutter Controller

v1.07 Software Release for setting up Diallers and Intercoms

Our software allows you to change your dialler and intercom settings, numbers and messages remotely using the internet.  It requires a small amount of data allowance to be available on your SIM.  A session will use a couple of kB.

v1.07 will work with any firmware release from 5.10 onwards.  We can remotely update your dialler and intercom with the latest firmware if required (you must have at least v5.10 to start with).

The software is available from our Downloads page:

Please note currently we do not require installation of the software which is available as a raw EXE file.  If you download this from our website you can trust it.  You may need to click ‘run anyway’ on the Windows security message box.  We will release an installation version over the next few weeks.