RC Radio Controlled Switch with Relay

Rajkumar Sharma
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medium
Tested
SKU: EL136338
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This RC Relay project enables control of large current devices using a Radio Control (RC) System. This RC switch converts hobby radio control (RC) pulses to control the on/off state of the Relay. On board LED indicates the output. The board is Arduino compatible and the example code can be modified as per user requirements. The relay ON/OFF threshold can be set as per user requirements. The Arduino sample code enables momentary ON/OFF control of the relay, but this can be modified for Latch output. The relay can handle a load up to 7A – 30V DC or 7 Amps 230AC Loads such as bulbs, LEDs, motors, fans, heaters etc. The project can be connected to an unused RC channel. It operates with 5V DC and draws 60mA current when the relay is ON. 3 Pin male header helps the user to connect the RC receiver. The project is Arduino compatible and can be programmed using Arduino IDE with the help of an onboard programming connector. The project consists of an Atmega328 microcontroller, programming/bootloader connector, relay, BC847 BJT transistor to drive the relay, freewheel diode for protection from the relay, and U2 PC817 provides isolation between the microcontroller and relay. D1 LED indicates output, D3 LED power LED. connector CN2 relay switch connection, connector CN1 5V supply input.

Note: This board will work with any standard RC remote. In this project, we tested it with HOTRC DS-600 6CH 2.4GHz Radio System. Standard RC radio outputs is 50Hz – 1mS(1000uS) to 2mS(2000uS)

Arduino Programming

Arduino Code is available as a download below. The user will be able to operate the Relay while the RC radio joystick is pulled down and the pulse width is between 1460 – 1090uS. The user may change this value in the code. Connector CN3 is provided to burn the bootloader and upload the Arduino code. Please refer to the connection diagram for programming.

More info about new Atmega328 chip programming: https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoToBreadboard

Arduino Code Credits: “Tech Home” YouTube Channel

Features

Supply 5V DC
Current 60mA when Relay is On
RC Signal 1000 to 2000 uS
Relay Switch Activate Threshold Time 1460 – 1090uS
Relay Output-Load 230V AC Up to 7Amps, 30V DC up to 7Amps
On Board Power LED
On Board Output LED
Header Connector for RC Receiver Interface
4 x 2.5mm Mounting Holes
PCB Dimensions 66.68 x 22.23mm

Connections and Other Details

CN1: Pin 1 = VCC, Pin 2 = GND
CN2: Relay Switch/Output Pin 1 = Normally Closed, Pin 2 = Common, Pin 3 = Normally Open
CN3: Programming Connector Pin 1= TX, Pin 2 = RX, Pin 3 = Reset, Pin 4 = GND, Pin 5 = VCC, Pin 6 = D11, Pin 7 = D12, Pin 8 = D13
CN4: RC Receiver Pin 1 = RC Pulse Input, Pin 2 = VCC, Pin 3 = GND
D1: Relay Output LED
D3: Power LED

Schematic

Parts List

NO	QNTY	REF.	DESC	MANUFACTURER	SUPPLIER	SUPPLIER'S PART
1	1	CN1	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
2	1	CN2	3 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1248-ND
3	1	CN3	8 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5321-ND
4	1	CN4	3 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
5	2	C1,C3	10uF/16V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
6	2	C2,C4	0.1uF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
7	1	C5	DNP
8	2	C6,C7	22PF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
9	2	D1,D3	LED RED-GREEN SMD SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
10	1	D2	1N4007 SMD DIODE	DIODE INCORP.	DIGIKEY	S1MBDITR-ND
11	1	Q1	BC847AL SMD SOT223	NEXPERIA	DIGIKEY	1727-2924-2-ND
12	1	RL1	Relay 5V	CIT RELAY	DIGIKEY	2449-J107F1CS125VDC.36-ND
13	2	R1,R6	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
14	1	R2	10K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
15	2	R3,R5	2K2 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
16	1	R4	470E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
17	1	R7	1M 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
18	1	R8	4.7E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
19	1	U1	ATMEGA328TQPF-32	MICROCHIP	DIGIKEY	ATMEGA328PB-AURCT-ND
20	1	U2	PC817 DIP4	AMERICAN BRIGHT	DIGIKEY	BPC-817(BBIN)-ND
21	1	X1	16Mhz	ECS INC	DIGIKEY	X1103-ND