Radio and DTMF Remote Controller
Connects to an external radio or uses optional plug in GSM module to read
eight inputs and control eight outputs at a remote site with full voice response.
Available in three versions:
- Professional GSM version with both radio and GSM options fitted
- Professional radio version with radio control only NZ$500
- Amateur radio kitset version with radio control only.
- Voice status of inputs and outputs
- Voice dictionary stored on standard SD card
- Simple process to add or replace words in any language
- Password protected operation, two levels, read status only and read/change status
- Four Analog inputs, 2.5V and 25V input range jumper selectable
- Four Digital inputs, internal pull-up resistor, ground to activate
- Dallas One-Wire interface for temperature measurement
- Four normally open relay outputs, can switch up to 3A loads
- Four FET outputs to switch up to 500mA at 12V
- Variable voltage output (DAC), can supply up to 1A depending on selected voltage
- Holtek HT9170 DTMF decoder
- Texas Instruments MSP430 microprocessor
- Audio and PTT interface for radio connection - isolated
- Optional GSM cellphone module
- 6-18V DC supply
The configuration of the controller can be done relatively easily by the end user
with a PC. If you prefer to have Harvest Electronics program the unit for your
application we will do that for US$50 and email you the finished file usually within
24 hours. Email firstname.lastname@example.org for this service.
The professional versions come with full telephone help desk and email support and
12 month warranty. Email email@example.com for support or call Harvest Electronics
(+64) 6 370 1991 during New Zealand business hours. The Ham kitset version has no
warranty and is supported only by email from one of the hams at Harvest Electronics.
Email firstname.lastname@example.org, no telephone support available for the kitset version.
The manual is available in our support area
The C source code for the GNU TI MSP430 compiler is available on request for those
who would like to add extra features. Any additional features added by users will be
evaluated and included in future releases. All users (professional and ham radio) agree
that the intellectual property in this product belongs to Harvest Electronics and you
also agree to have lightning strike you if you steal the intellectual property for
The Harvest DTMF controller was originally conceived as a fun Ham radio project but
the huge effort involved meant that we would probably never have had the time to complete
it after hours. So we have combined the radio and GSM cell phone features into a product
which we have developed during work time. We are probably kidding ourselves but we like
to think it might have some commercial applications to justify the time and money spent
Peter Munn ZL2LD the founder of Harvest Electronics wanted to give
something back to the amateur radio hobby that launched his career in electronics. The
PCB was laid out by Gary Anderson ZL2VAR who is a design engineer at Harvest. Support
is generally by Glenn ZL2TLD another one of the hams here at Harvest.