Akit-BASIC Stamp2SX : BASIC Stamp2SX Activity kit
l
5
+5V
C5
47/16V
IC2
7805
C3
220/25V
J1
DC INPUT
9-12V
C6
0.1/50V
C4
0.1/50V
D1-D4
1N4001 x4
K5
DC
INPUT
+
-
S6
ON / OFF
24
23
22
21
20
19
18
17
NC
GND
1
2
3
4
5
6
7
8
RxD
ATN
GND
TxD
9
10
11
12
16
15
14
13
K1
DB-9
FEMALE/PCB
DOWNLOAD
2
3
4
5
6
7
RST
+5V.
P15
P14
P13
P12
P11
P10
P9
P8
P0
P1
P2
P3
P4
P5
P6
P7
R1-R8
470
LED8-LED1
PHASE A to D COIL
D
A
B
C
+V
NC
COM
NO
S5
RESET
+5V
S1-S4
R9-R12
220
SP1
SPEAKER
+5V
RP1
4k7 * 4
LDR1
C2
0.1
m
F
50V
+5V
P15
+5V.
GND
4 3 2 1
9
16 15 14 13
10
7
8
K2
STEPPER
MOTER
IC1
ULN2003
+V
SK1
i-Stamp
R13
1k5
LED9
RY
STEPPER MOTER
RY1
RELAY 12V
K3
RELAY
OUTPUT
K4
SERIAL
DATA
R14-R15
220
R15
C1
10
m
F 50V
R14
CONTACT RATING
250V 5A
+V
Figure 4 AX-2SX board schematic
4.1 8-LED outputs
All 8-LEDs will be connected with P0 to P7 of i-Stamp via current limit resistor. All LED
wil operate at Logic “1” or active high.
4.2 Stepper motor driver
At P0 to P3 of i-Stamp share with drive LED and connect with ULN2003 driver IC.
ULN2003 will be use for driving a uni-polar stepper motor. ULN2003 contains 7 open-collector
inverter. Its inpur can accept TTL logic and output can drive high current load over +5V.
Maximum is +30V 500mA per output. In AX-2SX will connect with a uni-polar stepper motor.
The motor supply voltage gets from DC adaptor.
Driving the stepper motor is not difficult. Sendd logic “1” from i-Stamp port (P0-P3) to
input of ULN2003. After that ULN2003 will invert logic to “0”. It cause the current draw into
the motor’s phase that connect with ULN2003 output. The shaft of motor will spin one
step. If all phase are received the continuous signal, stepper motor spins continuous.
