This document describes a 4-channel infrared remote control system including both a transmitter and receiver. The transmitter uses an HT12A chip and infrared LED to transmit codes for 4 buttons. The receiver uses an HT12D chip and TSOP1738 infrared sensor to receive the codes and control 4 relays, with LED indicators for each relay and an overall power light. Jumpers are used to set the transmitter and receiver to the same address and select either momentary or latching function.

1. BUILDSMARTERe-circuits
4 CHANNEL INFRA-RED REMOTE
Author Rajkumar Sharma
sales@anykits.com I www.anykits.com

2. BUILDSMARTERe-circuits
sales@anykits.com I www.anykits.com
TRANSMITTER
A0
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
GND
9
D8
10
D9
11
L/MB
14
X2
15
X1
16
DOUT
17
VDD
18
D10
12
D11
13
U1
HT12A
+
C3
4.7uF/16V
R1
100E
R2 10K
VDD
VDD
X1
455K
R4
330E
R3
10M
C1 100pF
C2 100pF
J1 JUMPER
SW1
8WAY DIP SW
SW2 SW
SW3 SW
SW4 SW
SW5 SW
Q1
BC547
J1 CLOSE MOMENTY FUNCTION
J1 OPEN LATCH FUNCTION D1
IR LED
D2
RED LED
SW6
ON/OFF SW
BT1
4.5V
4 CHANNEL INFRA-RED REMOTE

3. BUILDSMARTERe-circuits
sales@anykits.com I www.anykits.com
RECEIVER
GND
9
DIN
14
VT
17
VDD
18A0
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
OSC1
16
OSC2
15
D8
10
D9
11
D10
12
D11
13
U2
HT12D
+C1
4.7uF/16V
R1
47E
R3
4K7
SW1
8W DIP SW
BT1
6V
Q1
BC547
SW2
ON/OFF SW
3
5
4
12
RE1
RELAY
D1
1N4007
+ C2
4.7uF/16V
D6 POWER INDICATION
ALL RELAY 6V
R10
330E
D6
LED
CN1
PBT3
D3 VALID TRANSMISSION
U1 INFRA RED SENSOR
VDD
R6
47K
VDD
VDD
SW1 ADDRES SET TRANSMITTER AND RECIVER ADDRES SHOULD BE SAME
VDD
R5
220E
D3
GREEN LED 3
5
4
12
RE2
RELAY
Q3
BC547
D2
1N4007
VDD
R7
4K7
CN2
PBT3
3
5
4
12
RE3
RELAY
Q4
BC547
D4
1N4007
VDD
R8
4K7
CN3
PBT3
3
5
4
12
RE4
RELAY
Q5
BC547
D5
1N4007
VDD
R9
4K7
CN4
PBT3
GND
1
VCC
2
OUT
3
U1
TSOP1738 R4
3.3K
Q2
BC547
R2
10K
4 CHANNEL INFRA-RED REMOTE

4. BUILDSMARTERe-circuits
sales@anykits.com I www.anykits.com
RECEIVER
4 CHANNEL INFRA-RED REMOTE