Remote-processing BASIC 52 Manual do Utilizador descarregar pdf (Página 61)

RPBASIC-52 PROGRAMMING GUIDE

2-42

BAD DATA When channel is out of range for a card.

EXAMPLE

The following example sets up frequency multitaskin g and prints the counts received in a time interval.

10 LINEB 6,1,32

20 LINEB 6,1,72 : REM Reset counter and enable inputs

30 CONFIG FREQ 0,200 : REM Get count every second (5 ms * 200)

40 C = 5/56000 : REM Constant using Greyhill module. 5V / 56000Hz = V/Hz

50 CLEAR TICK(0)

60 IF TICK(0) < 1 THEN 40 : REM Wait for a second

70 A = FREQ(0) : REM Get frequency

80 V = (A-14400) * C : REM Multiply by constant to get Voltage

90 PRINT "Voltage = ",V, "Frequency =",A

100 GOTO 50

You may need to add a 1K ohm pull up resistor from the output of the Greyhill module to the input of the

counter. The input rise time should be 1 micro-second or faster.

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Remote-processing BASIC 52 Manual do Utilizador Página 61