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10 A8 9 A7 7 A6 6 A5 5 A4 4 A3 3 A2 2 A1 1 A0 12 VSSD 13 VSSA 26 XCLK
4x AA Batteries
IC1 ISD2532
25 VCCD VCCA EOM 24 10 P10 15 P5 PD 27 11 P9 14 P6 P_R 23 12 P8 13 P7 CE C6 17 Vdd MIC 0.1 uF MIC C7 18 MIC REF 20 0.1 uF ANA IN 21 R5 R4 ANA OUT 1k 19 AGC 10k C5 R2 4.7k C4 R1 C8 R3 10k 10 uF 330k 0.1 uF 220 uF
14 SP+ 15 SPSPKR
FIGURE 31-4 Circuit to allow a BS2 to control an ISD2532 solid-state sound recorder/player. While this circuit s operation is controlled from a PC console, by changing the control software, it can be easily integrated into a robot.
SOUND INPUT AND OUTPUT
TABLE 31-2 BS2 IC1 R1 R2 R3, R4 R5 C1 C2, C3 C4 C5 C7 C8 SW1 MIC SPKR Misc.
Parts List for BS2 Control of an ISD Sound Recorder/Player Chip Parallax BASIC Stamp 2 ISD2532 sound recorder/player 330k resistor 4.7k resistor 10k resistor 1k resistor 220 F electrolytic capacitor 0.1 F electrolytic capacitor 10 F electrolytic capacitor 0.1 F ceramic capacitor 220 F electrolytic capacitor Breadboard mountable SPDT switch Electret microphone 16 speaker Large breadboard (6 in or longer), breadboard wiring, 4 AA battery clip, 4 AA alkaline batteries, BS2 serial port programmer interface
' Variable Declarations InputString VAR Byte(2) Temp VAR Byte LastCharFlag VAR Bit i VAR Byte CE PIN 8 P_R PIN 9 PD PIN 10 EOM PIN 11 ' Initialization HIGH CE LOW P_R HIGH PD Main Loop DO DEBUG "Command (R/P)> " i = 0 InputString(i) = 0 LastCharFlag = 0 DO WHILE (LastCharFlag = 0) DEBUGIN STR Temp\1 IF (Temp = CR) THEN LastCharFlag = 1
' ' ' '
No Operation Start with Recording Hold the Chip High Loop Forever
' ' ' ' '
Start with Null string Want to execute at least once Wait for Carriage Return Wait for a Char to be input String Ended
31.2 ELECTRONICALLY RECORDED SOUND OUTPUT
ELSE IF (Temp = BKSP) THEN IF (i = 0) THEN DEBUG " " ' Keep Screen at Constant Point ELSE DEBUG " ", BKSP ' Backup one space i = i - 1 ' Move the String Back InputString(i) = 0 ENDIF ELSE IF (i >= 1) THEN DEBUG BKSP, 11 ' At end of Line or NON-Char ELSE ' Can Store the Character IF ((Temp >= "a") AND (Temp <= "z")) THEN Temp = Temp - "a" + "A" ENDIF DEBUG BKSP, STR Temp\1 InputString(i) = Temp i = i + 1 InputString(i) = 0 ' Put in new String End ENDIF ENDIF ENDIF LOOP IF (InputString(0) = "R") THEN LOW P_R ' Specify Record LOW PD ' Enable the ISD Chip PULSOUT CE, 1 ' Start the Recording Process DEBUG "Recording. Press Any Key to Stop..." DEBUGIN STR Temp\1 PULSOUT CE, 1 ' Start the Recording Process IF (Temp <> CR) THEN DEBUG CR HIGH PD ' Finished ELSE IF (InputString(0) = "P") THEN HIGH P_R ' Specify Play LOW PD PULSOUT CE, 1 ' Start the Recording Process DEBUG "Playing..." DO WHILE (EOM = 1): LOOP HIGH PD ' Finished DEBUG CR ELSE DEBUG "Invalid Command", CR ENDIF ENDIF LOOP
This program uses the console interface presented earlier in the book for the BS2 I/O port read and write accessing to demonstrate how this function can be used for different applications. In a robot application, just the code that is used to Specify Record and Specify Play is required. This application runs the ISD chip in push-button control mode, which allows multiple messages to be stored on the ISD chip, using address pins A0 through A5. This will give you up to 32 (short) messages that can be used to show off the capabilities of the robot or give you feedback as to what its input is or what functions it is executing.
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