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turn off output device Reset routine clear all variables to zero Listen for DTMF read status register activate chip-select pin store DTMF-det bit in flag de-activate chip-select pin if tone, then continue listen again Tone detected, test code get DTMF data (low rs pin) activate chip-select pin remove upper bits using AND de-activate chip-select pin increment tone counter resets >2000 wrong entries ' convert tone to string ' convert string to value ' wrong digit "reset" ' IF all digits are in the ' correct order, AND after ' only one attempt, THEN ' increment the sequence ' counter variable : "G" ...
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' listen again ' Sequence counter
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Listing 14-1 Radio mailbox program.
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RADIO MAILBOX PARTS LIST 191
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G=G+1 ' increment if C=9 and J=9 and G=9 then Relay ' activate output device goto Listen ' listen again Relay: pause 100 low P_R ' Relay output routine pause 800 ' wait time delay low 7 ' turn on output device pause 200 ' wait time delay goto Begin ' begin again
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Listing 14-1 Radio mailbox program (Continued).
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radio mailbox do its magic. You may have to adjust the proper audio level to prevent distorted audio from reaching the radio mailbox; this might take a few tries to get right. Operation begins with your radio buddies sending the proper touch-tone sequence to your radio. Once the proper tone sequence is received and decoded, the STAMP 2 takes the output at pin 12 to a low state, which propagates a low through the exclusive OR gate at U4, thus triggering the ISD2590 to begin recording the first message. After the voice message has been recorded, the radio operator sends the digits #9 (pound-nine) to reset the tone decoder. Once the decoder is reset, it waits for the proper tone sequence. A number of recorded messages can be recorded by different radio friends, and, on returning to your radio, you can elect to listen to all the recorded messages by simply toggling S3 to the play position. When you have listened to all the recorded messages, just return S3 to the standby position. This project has many possibilities, and it can be expanded with many more features if desired. Just enter the magic code *1234567# and the radio mailbox is ready to serve you!
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U1 U2 U3 U4 U5 U6 R1, R5 R2, R13, R14 R3 R4 R6, R7 CM8880 touch-tone decoder chip BASIC STAMP 2 (original) ISD2590 voice recorder chip LM7486 exclusive OR gate TLC2471I audio amplifier chip LM7805 5-V regulator IC 10-k 100-k 390-k 3.3-k 47-k
1 4-W resistor 1 4-W resistor 1 4-W resistor 1 4-W resistor 1 4-W resistor
192 RADIO MAILBOX
R8 R9 R10 R11 R12 C1 C2, C3, C5 C7, C8, C9, C10 C11, C12, C16 C4 C6, C15 C13 C14 XTL S1, S3 S2 Miscellaneous
200220-k 1-k
potentiometer (20 turns)
1 4-W
resistor
470-k 5.1-k
4-W resistor 1 4-W resistor 1 4-W resistor
0.1- F 200-V polyester capacitor 0.1- F 35-V ceramic capacitor 0.1- F 35-V ceramic capacitor 0.1- F 35-V ceramic capacitor 3- F 35-V electrolytic capacitor 10- F 35-V electrolytic capacitor 0.22- F 35-V ceramic disk capacitor 4.7- F 35-V electrolytic capacitor 3.579-MHz color burst crystal SPST toggle switch Momentary pushbutton switch (normally open) IC sockets, PC board, wire, male and female headers, DB-9 connectors
ORB-TRACKER: AUTOMATIC SATELLITE AZ-EL ROTOR CONTROL
CONTENTS AT A GLANCE Basic Components for Orbit
POWER SUPPLY
Construction of the Orb-Tracker Orb-Tracker Orbit 360 Parts List
Basic Components for Yeasu 5500 Orb-Tracker Yaesu 5500 Parts List Positional Readout
he Orb-Tracker project is designed to remotely control the azimuth and elevation of a satellite antenna system. Many amateur radio operators and weather satellite enthusiasts need a method to control their high-gain satellite antenna systems. The Orb-Tracker will control two single low-cost antenna rotators such as the Gemini Orbit 360 or the dual-rotator Yeasu 5500 azimuth/elevation (AZ-EL) rotator using a BASIC STAMP 2 microcontroller. In order to track low-earth-orbit satellites, amateur radio and other satellite enthusiasts use satellite tracking software, which is readily available. NASA originates data sets that are used to track the many orbiting satellites that cross the heavens every day and night. These satellite data sets are readily available and can be downloaded every month with updated parameters for many satellites now in the sky. A few satellite tracking programs, such as WISP, NOVA, and The Station Program, send out serial data from the standard serial port of the PC. The EASYCOMM data format from
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