Make Wonders with 1 Channel RF Relay Module
- 12v Mini Air Pump Motor, ADS1115, Audio amplifier, Convertor Module, Digital Temperature Controller Module, Digital Volt Meter, High power, infrared sensor, IR Sensor Array, OLED Display Module, RCWL-0516 Microwave Radar Sensor, RF Relay Module, SD Card Module, TCS3200, Thermostat, TTP226, Voltage regulator, W1209
- 05 Feb, 2021
RF (Radio Frequency) Transceivers are devices or modules capable of both receiving as well as well as transmitting information. It is used to transmit and receive radio signals between two particular devices, in fact wirelessly communicating with another device is one of the main applications of an RF module. These devices are excellent for wireless communication over a short distance and are usually cheap and easily available. These radio frequency modules can be made portable in size and can be embedded with a number of devices on a board to provide remote access to these said devices, here we have combined a transceiver RF module with a relay making it possible to remotely control the relay and thus controlling another device which is in turn connected to the relay.
moving and can be controlled through an electromagnet. A relay consists of three terminals that is normally open, normally closed and a common terminal. When the relay module does not receive an electrical signal the common terminal and the normally closed terminals are connected, however when we provide it with an electrical signal the common terminal is connected to the normally open terminal closing the circuit.
How does the module work?
It is a wireless relay module which uses a remote to switch the relay from normally closed to normally open position and vice versa. It has only one channel meaning that we can only control one relay from our remote. The relay module has an operating voltage of 12 V DC and can work up to a distance of 150 metres, the distance varies according to the environment. The radio frequency of the module is 433 MHz and it has 3 modes which can be accessed using the small button on the module. The 3 modes of the module are :
I. Momentary mode
In this mode the relay is switched to the normally open terminal as long as the button on the transmitter remote is pressed. We can configure the module to work in such a way that both the
buttons of the remote access the momentary mode of the module. To access the momentary mode, we press the button on the module an indicator LED will blink once as soon as we press the button, after a few milliseconds the LED will turn on waiting for us to give an input via the remote. When we press a button on the remote the indicator LED on the module will turn OFF and we can use the module in momentary mode using 1 button of the remote. We can set up the second button to be used in momentary mode by following the same steps.
II. Toggle mode
In this mode we can use the same button on the remote to switch the relay from normally closed to normally open and vice versa. If we press the button on the remote once it switches from normally closed to the normally open terminal of the relay, if we press the button again it switches back from normally open terminal to the normally closed terminal of the relay. To access toggle mode press the button on the module twice, the indicator LED will blink twice and will turn ON after a few milliseconds. The module then waits for an input from the transmitter remote, as soon as we press a button on the remote the indicator LED turns OFF and the module works in toggle mode for the particular input button. We can set toggle mode for the other input button as well by following the same instructions.
III. Latch mode
In this mode we use one button to switch relay module to one channel and another button to switch the relay module to another channel. This mode can be accessed by pressing the button on the module thrice, the indicator LED will also blink three times and turn ON, this indicates that the module is waiting for inputs from the transmitter remote. The first button we press will switch the relay from normally closed to normally open mode and the second button will switch the relay back to normally closed from normally open. The module now works in latch mode.
We can also reset the relay module by pressing the button 8 times, doing so will clear the module memory and will reset it back to default settings.
How to use the module?
To demonstrate how the module works we will be connecting an LED to the relay to show the outputs in various modes.
• Connect the V+ and V- pins of the relay module to positive and negative terminals of the DC power supply respectively.
• Connect the positive terminal of the LED to 10 K ohm resistor and the other leg of the resistor to the Normally open terminal of the relay.
• Connect the negative terminal of the LED to the common ground.
• Connect the positive terminal of the 12 V DC supply to common terminal of the relay.
Connect the circuit according to the instructions and use the circuit diagram for reference. Switch on the power supply and the module is now ready to use. To use the module in different modes i.e. toggle, momentary and latch follow the instructions given above. We can connect any device to this relay module in place of the LED that we are using here.
Applications• Home lighting systems
• Home automation
• Security monitoring
• Can be used for various electrical appliances like geyser, fridge etc.