How to Use a KR1204 433MHz 12V 4-Channel Relay RF Wireless Remote Control Switch FOB

How to Use a KR1204 433MHz 12V 4-Channel Relay RF Wireless Remote Control Switch FOB

In this tutorial, we will explore how to use the KR1204 433MHz 12V 4-channel relay module to control various AC or DC loads remotely. The relay module allows you to switch devices on and off using a wireless remote control, making it a versatile tool for home automation and other projects. By the end of this guide, you'll be able to wire the module correctly and understand how to program it for different modes of operation.

33 MHz 4-channel remote relay: with classic remote — 33MHz 4 channel Remote Relay: with classic remote

33MHz 4 channel Remote Relay: With key chain remote

33 MHz 4-channel remote relay: with keychain remote — 33MHz 4 channel Remote Relay: with classic remote

33MHz 4 channel Remote Relay: With key chain remote

The KR1204 relay module operates at 12 volts and can control multiple devices simultaneously. Each relay can handle up to 10 amps, allowing you to control a variety of appliances. You will also learn about the different programming modes available, such as momentary, toggle, and latch modes, which determine how the relays respond to button presses on the remote. For detailed clarification on these modes, refer to the video (in video at 04:00).

Hardware Explained

The KR1204 module consists of several key components: the relay outputs, the RF receiver, and the remote control. Each relay is a mechanical switch that can turn a device on or off by connecting or disconnecting the circuit. The RF receiver picks up the signals from the remote control, translating them into commands for the relays. The remote control operates at 433MHz, which is a common frequency for RF devices and allows for reliable communication over short distances.

33 MHz 4-channel remote relay: Loads 1 and 4 are on. — 33MHz 4 channel Remote Relay: Load 1 and 4 are ON

The relays are labeled with three terminals: Normally Open (NO), Common (COM), and Normally Closed (NC). This labeling helps you understand how to connect your loads. The module also has a power input for the 12V supply and an LED indicator that shows when it receives a signal from the remote control.

Datasheet Details

Manufacturer	Qiachip
Part number	KR1204
Logic/IO voltage	12 V
Supply voltage	12 V
Output current (per channel)	10 A
Peak current (per channel)	15 A
PWM frequency guidance	N/A
Input logic thresholds	Low: 0-2V, High: 3-12V
Voltage drop / R_DS(on) / saturation	1.0 V max
Thermal limits	0°C to 70°C
Package	Module
Notes / variants	Various remote options available

Ensure the module is powered with a stable 12V supply.
Use proper heat-sinking if operating near maximum ratings.
Do not exceed the current rating per channel to avoid damage.
Be cautious with wiring; incorrect connections can lead to short circuits.
Keep the RF antenna straight for optimal signal reception.
Utilize the NC and NO terminals appropriately based on your application.
Test individual relays before connecting loads to ensure functionality.
Understand the programming modes to fully utilize the relay's capabilities.

Wiring Instructions

To wire the KR1204 relay module, start by connecting the power supply. Connect the positive lead of your 12V power supply to the VCC terminal on the module, and connect the negative lead to the GND terminal. Next, for each relay channel, you will use three terminals: NO, COM, and NC. For example, if you want to connect a load (like an AC bulb) to channel 1, attach one wire from the load to the NO terminal and the other wire to the COM terminal. This setup will allow the relay to control the power to the bulb when activated.

Repeat this process for the other channels if you are connecting more devices. Ensure that the devices you are controlling are within the current rating of the relays. If you press the corresponding button on the remote control, the relay should activate and switch the load on or off. Be careful when working with AC voltage, and make sure to follow safety precautions.

33 MHz 4-channel remote relay module without box — 33MHz 4 channel Remote Relay: Module without box

Demonstration / What to Expect

Upon completing the wiring and programming, you should be able to control your devices using the remote. Each button on the remote corresponds to a different relay, allowing you to turn devices on or off independently. Common pitfalls include incorrect wiring, which can cause devices not to respond or even damage the relays. Additionally, ensure that you are using the correct programming mode for your intended application (in video at 18:30).