DTMF decoder kit, morse transpond, 6 outputs or serial

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DTMF decoder kit, morse transpond, 6 outputs or serial:
$18.72

DTMF decoder kit with multiple outputs, serial (RS232 compatible) & morse transpond. This item is supplied as a kit of parts with a high quality PCB.

All outputs canbe turned on, off, toggled or pulsed, Morse transpond canbe turned off.

Our DTMF decoder kit has 6 NPN open collector darlington outputsthat can be switched on/off remotely with or without a 4 digit security code. The outputs can switch relays directly if desired, and have back EMF protection diodes. The decoder also has an NPN open collectorTX keying output to key a transmitter for transponding a morse confirmation. An audio output is included for the morse audio tones. The PCB has been designed to allow 3 input configurations - unbalanced audio, an electret microphone or balance audio to be connected.

An alternative option is to use the kit as a DTMF to PC interface allowing DTMF tones to be displayed in say Hyperterminal (see below).

To turn on/off an output send the decoder it\'s ID followed by the output number and * for ON or # for OFF e.g. 12341* turns on output 1 and 12342# turns off output 2 etc.

To toggle an output send e.g. 12341A and the state of the output will be changed to the oposite of it\'s previous state - the morse transpond will be confirmation of the new state.

To pulse an output send e.g. 12341B and the output will turn on for 0.5 seconds - the morse transpond will be e.g. 1P.

You can use 9 for A and 8 for B on the latest firmware, this is useful when you only have a 12 key DTMF pad such as on a mobile phone.

For confirmation of the desired switching of an output the decoder will key a Transmitter and respond in morse code, e.g turning on output 1 will respond as 1 ON in morse, and turning off output 2 will respond as 2 OFF. As there are onlydigits and4 letters to learn, morse shouldn\'t put you off. There is a 2 second transpond delay followed by a 400ms link establishment delay to allow for CTCSS (if used).

The 4 digit security ID can be changed by simply fitting a jumper to CN7, powering up the decoder and sending it a new 4 digit ID, then remove power, remove jumper and power-up and the new ID is set. If no ID is required then simply program the ID as 0000 and on next power-up no ID will be needed and e.g. 1* will turn on output 1.

If using the kit for DTMF to serial - program the ID as 2320 and on next power-up decoded DTMF tones will be output as RS232 (4800 baud) compatible serial on the TX keying output, (fit the pull-up resistor R12 for this use).

The PCB is a high quality double sided PTH (plated through hole) 1.6mm FR4 (Fiberglass) board 64 x 38mm in size.

A 4 pin programming header is also provided to allow in-circuit re-programming of the PIC.

All parts shown in the assembled photo are included in the kit as well as some extras for alternative input configuration.

Full details of the kitincluding a circuit diagramcan be found here in this PDF:- an assembled version of this kit in a YouTube video demo:-YouTube.com/watch DTMF decoder kit video

-----Parts list-----

Part Type

IC1 78L05
IC2 HT9170B
IC3 PIC16F627A
IC4 ULN2003
TR1 BC184L
D1 1N4148
XT1 3.579MHz crystal
XT2 4MHz 3 pin ceramic resonator with internal caps
R1* 4K7
R2, 4 not fitted
R5wire link
R3* 270K
R6*, 8 1K
R7 330K
R9, 10, 11, 12* 10K
VR1 10K variable
C1, 5, 6, 12 100nF
C2not fitted
C3, 4 22pf
C7, 8, 11 1uF
C9, 10 not fitted
CN1, 6 3 pins
CN2, 4, 7 2 Pins
CN34 Pins
CN5 8 pins

Also supplied:-

DTMF decoder PCB Iss A
3 x 0.1\" jumper links
2 x 10K for alternative input configuration

*Note

Only fit R6 if using an electret microphone as input.

Only fit R1 & R3 as 4K7 & 270K for use with a microphone,
otherwise fit R1 & R3 as 10K or calculate a custom input configuration
from HT9170 datasheet.

Only fit R12 if using for serial output.

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All parts and the PCB are RoHS complient and can be soldered with tin/lead or lead free solder.

All items sent byfirst class postin UK and Air Mail outside the UK.The kit is packed in a plastic box to protect the parts.

Combined postage- we combine postage when you buydifferent productsfrom us at the same time with one payment, we only charge £0.50 per additional product.