ID Timer / Annunciator

Transcription

1 NØXAS ID Timer / Annunciator ID-O-Matic The ID-O-Matic is a single chip ID timer/annunciator intended for Amateur Radio and other applications. Several modes of operation make it suitable for use in the shack or as an automatic Morse code ID for beacons, repeaters and fox hunt transmitters. Details of how to use the chip in your own project are in these instructions. Features of the ID-O-Matic: Supply voltage from 3 to 5.5V Low parts count Serial interface for setup from PC or terminal Speed adjustable from 5 to 60 WPM Variable pitch audio sidetone Uses dual color LED for green/yellow/red indicator Reminder mode for shack use Auto ID mode with repeater mode inputs Morse keyboard mode All memory and parameter settings retained with power off Compact, single 18-pin package ideal for standalone use or integration into transmitter or transceiver INHIBIT input to delay ID START input to prevent beaconing on quiet channel Audio (MCW), CW and PTT outputs CW and PTT outputs drive MOSFETs for direct connection to many rigs 64-character Morse message memory AR, BT, SK prosigns and character supported Delays from 1 second to over 9 hours are possible ID-O-Matic Manual 1/18/2005 Page 1 of 6

2 Chip Pinout Information Pin Port IN/OUT FUNCTION 1 A2 NA Unused, leave unconnected 2 A3 NA Unused, leave unconnected 3 A4 NA Unused, leave unconnected 4 A5/ MCLR IN Reset input, active LOW. Tie high to Vdd with a 10K Ohm resistor. Use a SPST, normally -open pushbutton switch to ground. This will reset the ID-O-Matic. In ID timer mode, this will silence the alarm and restart the timing interval. 5 Vss GROUND Vss (Ground) 6 B0 IN TEST input, active LOW. Normally held high by an internal weak pull-up. Ground momentarily to hear the programmed Morse code ID announcement without waiting for the timer to expire. 7 B1 IN Serial RxD. Used for communication with a PC or other serial device. 8 B2 OUT Serial TxD. Used for communication with a PC or other serial device. 9 B3 OUT Audio (MCW) output. This square wave signal can be used to drive a very small speaker, amplified and filtered, or fed into the audio chain of your repeater or rig. 10 B4 OUT Red LED output 11 B5 OUT Green LED output 12 B6 IN INHIBIT input, active LOW. Normally held high by an internal weak pull-up. Drive this line LOW to delay the ID for any length of time. For instance, this could be used to delay ID until after a SQUELCH input goes inactive to avoid hearing the ID while someone is transmitting. 13 B7 IN START input, active LOW. Normally held high by an internal weak pull-up. Used only in repeater mode. This input will start a timing cycle. If repeater mode is selected, the ID -O-Matic will only announce if the START input has been active since its last ID. This avoids having a repeater ID every ten minutes even if no one is transmitting. 14 Vdd POWER Vdd, 3 to 5V 15 A6 NA Oscillator connects to 4 MHz xtal 16 A7 NA Oscillator connects to 4 MHz xtal 17 A0 NA PTT output, active HIGH. This goes active 100 milliseconds before the CW and audio ID star ts, and remains high 100 milliseconds after the message is complete. Also high when ID timer alarm sounds when not using a CW ID. 18 A1 NA CW output, active HIGH. Kit Construction: Keep all semiconductor parts in the anti-static foam or tube until you are ready to use them. Always use good static prevention practices when working with static sensitive parts. This means you should wear a grounding strap when possible, or work on a static-dissipative work surface. Use a grounded tip soldering iron. When soldering small parts it is a good idea to use a small, pencil-type soldering iron of no more than 25 Watts or so, or a temperature controlled soldering station. Use pliers, clamps or alligator clips as heat sinks to prevent heat damage to parts while soldering. If you are not fairly experienced with soldering small parts, you may want to practice on some scrap parts first or get some help. Work in an area with good lighting. You may want to use a magnifying lens to do some of the small soldering re quired. Insert each component from the top of the board (the side with the white silkscreen lettering), in the order shown in the table below. As each component is installed, solder the leads and trim off excess leads with a small pair of side cutters. ID-O-Matic Manual 1/18/2005 Page 2 of 6

3 Location Part R1 10K Ohm resistor (brown-black-orange) R2 470 Ohm resistor (yellow-violet-brown) R3 1K Ohm resistor (brown-black-red) R4, R5 2.2K Ohm resistor (red-red-red) C1.1 F capacitor (marked 104) Q1, Q2, Q3, Q4 2N7000 MOSFET make sure transistors are oriented as shown on the board U1 18-pin IC socket make sure notch in socket is positioned to match the board outline X1 4 MHz cylindrical crystal J1 DB-9 connector LED Dual-color LED. Mount the LED so the shortest lead (red cathode) and flat side of the LED base is toward the bottom of the board, closest to the board edge. Off-Board Connections You will probably want to install a RESET switch, speaker, etc. Pads are provided to connect a SPST normally open pushbutton switch to reset the timer, a speaker, and a battery or other power supply. A series of six pads (marked JP1) are provided along the edge of the board opposite the serial connector. These connections may be left open, or can be used as follows: Pad JP1-1 JP1-2 JP1-3 JP1-4 JP1-5 JP1-6 Function TEST input; ground this to hear the CW ID message. INHIBIT input; active low logic level input SQUELCH input; active low logic level input PTT output; open-drain MOSFET, 60 V 200 ma max. CW output; open-drain MOSFET, 60 V 200 ma max. Ground ID-O-Matic Manual 1/18/2005 Page 3 of 6

4 Powering the ID-O-Matic: Power can be supplied by battery or a smooth, regulated DC power source. Use the two points on the circuit board marked PWR; polarity is marked by - and + signs below the pads. Use any suitably sized SPST power switch to fit your application. Any voltage from 3 to 5.5 V should work fine. Three AA alkaline cells should last quite a while for shack use as a simple ID reminder. If you plan to build your ID-O-Matic into a rig or a repeater controller, don't worry about battery backup; all memory and parameter settings are retained in non-volatile EEPROM memory and will be automatically recalled when power is applied. Setup and Operation: For shack use as a simple ID reminder, simply turn the ID-O-Matic on. The LED should show green for nine minutes, then turn yellow. At nine minutes thirty seconds, the LED will begin to blink yellow and red. After ten minutes the LED will turn solid red and the ID-O-Matic will start to beep at you to remind you to ID. The open-drain PTT output can be used to drive an external indicator such as a lamp or LED. Push the RESET button to start a new cycle any time you ID. For beacon, foxhunt or repeater use, connect your ID-O-Matic to a PC or other serial terminal device through a suitable RS-232 interface such as the one shown in the schematic. Set your communication parameters for 9300 baud, eight bits, no parity, one or two stop bits and no handshake. As a quick check to see if your serial port and communication software is set up correctly, connect a serial cable to the computer but not to the ID-O-Matic. Short pins 2 & 3 at the end of your serial cable. Anything you type should be echoed back to your computer. Connect the ID-O-Matic and turn the power on. You should see the version number printed on your screen. Tap the ENTER key once to enter the setup menu. You will be prompted for several bits of information. In each case you can hit RETURN to keep the current setting, which will be displayed in parenthesis after the prompt. CW keyboard mode?: Enter Y to begin CW keyboard mode. In this more you can type a line of text up to 64 characters. When you hit ENTER, the ID-O-Matic will send the text in Morse code. You can use the following keys on your keyboard: o A-Z, upper or lower case o 0-9 o Period, comma, slant bar (/), at sign (@) and question mark o Equal sign (=) for BT, semicolon (;) for AR, greater-than (>) for SK o Minus (-) or plus (+) to slow down or speed up the code speed by one WPM. This speed change is effective only until you exit Morse keyboard mode. o Three consecutive hash marks (###) will exit Morse keyboard mode and reset the ID-O-Matic. ID Time: Enter the delay time, in seconds. This will be the time between ID reminders or Morse announcements. Yellow time: Enter the number of seconds from zero at which you want the LED to turn solid yellow. Blink time: Enter the number of seconds from zero at which you want the LED to begin blinking red/ yellow. ID String: Enter up to 64 characters for your desired Morse code ID. Common punctuation and prosigns are supported: o Type a dash ( ) for BT o Type a semicolon (;) for AR o Type a greater-than (>) for SK will be sent as the sign character (.--.-.) o Comma, period, slash and question mark signs are sent as typed o o Colon (:), less-than (<) and other characters will be ignored. Spaces, including trailing spaces, will be sent. This can be used to add a delay to the beginning and/or end of your message, for example if the PTT delay is not long enough for your equipment. Auto CW ID: Type Y to use the Morse code ID, or N for a simple beeper-style ID reminder. CW Speed: Enter the desired Morse code speed in words per minute. Audio Tone: Enter a number between 140 and 255. Lower numbers will produce a lower tone, higher numbers for a higher pitch. The default is 219 for about 800 Hz. Repeater?: Type Y if you intend to use the START input. Type N if you do NOT plan to use the START input, even if it will be used in a repeater. ID-O-Matic Manual 1/18/2005 Page 4 of 6

5 Green (solid) Green (blink) Yellow Yellow/Red Blinking Red Status LED colors and what they mean Timer is operating; timer is more than 60 seconds from expiring. In repeater mode, STAT input has been seen and ID timer is running. Timer is within 60 seconds of expiring. Timer is within 30 seconds of expiring Timer has expired. MCW audio: A square wave audio signal is provided on Pin 9. You can drive small loads such as many piezo speakers directly from the pin or through a capacitor, or use a small audio amp and filter if you wish. Some possibilities for sidetone include directly driving a small piezo speaker or using a small transistor amplifier. More elaborate solutions might include an audio amplifier such as an LM386 with filtering to "round off" the square wave to produce a more comfortable tone. Keying a transmitter: This version of the ID-O-Matic uses 2N7000 MOSFET transistors to drive the PTT and CW outputs. If you intend to use the ID-O-Matic with a rig requiring grid-block or cathode keying or any other application that will exceed 60 Volts or 200 ma, you will need to add a grid-block keying adapter such as the Universal Keying Adapter. Support: Should you need support, have questions, have feature requests or bug/problem reports, please feel free to contact me via at n0xas@botkin.org or n0xas@arrl.net. I will make every effort to respond as quickly as possible. Warranty: All parts are tested and are guaranteed against defects for 90 days from date of purchase. This warranty does not cover damage due to incorrect assembly, improper soldering or wiring, overvoltage, static damage or other misuse or abuse. If you have problems, please contact me via to arrange for an exchange or replacement part. If you accidentally damage a part, don t panic just contact me, replacements are not expensive. Unfortunately I cannot offer assembly or repair service, but you should be able to find someone local to help out in the event of problems with assembly. NOTE: Complete electrical specifications for the PIC16F628A can be found on Microchip s web site at ID-O-Matic Manual 1/18/2005 Page 5 of 6

6 Schematic of ID-O-Matic Kit: ID-O-Matic Manual 1/18/2005 Page 6 of 6