1. OEM BASIC Stamp 2sx
220 Ohm

2. Wiring diagram 2 OEM BASIC Stamp 2sx Microcontroller chip COM port
9 V battery
220 Ohm
220 Ohm
LED
Buzzer
IR Receiver
IR LED 5V
SIG
Note:
GND
OUT
Vdd
- is connection to negative pole of the battery
PING

3. Example 08a “PING” File: “Example-08a.bsx” ' Example 08a
' {$STAMP BS2sx}
' {$PBASIC 2.5}
' connect SIG pin of PING to pin 15 of BS2sx
time VAR Word DO
PULSOUT 15, 13
PULSIN 15, 1, time
DEBUG HOME, "time = ", DEC5 time
time = time */ $0CD
time = time / 2
time = time ** 2257
DEBUG CR, "Distance = ", DEC4 time, " cm"
PAUSE 100
LOOP

4. Example 08b “PING” File: “Example-08b.bsx” ' Example 08b
' {$STAMP BS2sx}
' {$PBASIC 2.5}
' connect SIG pin of PING to pin 15 of BS2sx
time VAR Word
cm VAR Word
freq VAR Word DO
PULSOUT 15, 13
PULSIN 15, 1, time
DEBUG HOME, "time = ", DEC5 time
time = time */ $0CD
time = time / 2
cm = time ** 2257
DEBUG CR, "Distance = ", DEC4 cm, " cm"
freq = cm * 50
FREQOUT 1,100,freq
PAUSE 50
LOOP

5. Example 09 “IR LED and receiver” File: “Example-09.bsx” ' Example 09
' {$STAMP BS2sx}
' {$PBASIC 2.5}
IR_detect VAR Bit
LOW 7
IR_detect = 0 DO
IR:
FREQOUT 7,1,38500
IR_detect = IN8
IF IR_detect = 0 THEN unbroken
DEBUG HOME, "Beam is broken; object detected "
HIGH 4
FREQOUT 1,50,1900
LOW 4
GOTO IR
unbroken:
DEBUG HOME, "Beam is unbroken; object not detected."
LOOP
END