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CHAPTER 9 SPEAKER

RPC-150 Page 21

Figure 9-1 Speaker pin location

Figure 9-2 Interface schematic

DESCRIPTION

Pin 16 on the card edge connector is the speaker output

from the 64180 C PU chip. This port can be used to

drive a speaker. The SO UN D com mand is use d to

generate a frequency.

Connecting a speaker

Refer to figure 9-2 below for circuit connections to a

speaker. T he series resistor determines the volume. the

Capacitor sets the lower frequency limit. Generally,

values from 100 uF to 470 uF ar e adequate. The

speaker may be any value but those with 50 ohms or

greater produce higher sound output.

WARNING: Do not connect pin 16 directly to a

speaker, ground, or + 5V, even

momentarily, as damage to the CPU

will result.

SYNTAX

SOUND frequency[,time]

Where: frequency = 20 to 15000 Hz

time = time in seconds

SOUND stops executing when CAM BASIC is not

running a program. The output will be at frequency until

SOUND is executed without a parameter or the optional

time is timed out.

frequency is not exact. It is, however, accurate enough

for most alarm or audio feedback applications.

NOTE: When SOUND is used with a time parameter,

program execution is suspended until it is timed

out.

Program ming ex ample

The following example produces tones from 200 to 5000

hz and back down again in 500 hz increm ents.

10 FOR N = 200 TO 5000 STEP 500

20 SOUND N,.5

30 NEXT

40 FOR N = 5000 TO 200 STEP -500

50 SOUND N,.5

60 NEXT

70 GOTO 10

To stop program execution, press the < esc> key.

1 2 ... 18 19 20 21 22 23 24 25 26

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