SmartRFy Relay Module Buying Guide: 1 vs 2 vs 4 Channels
By Official Hobby Components Online Store | Buy Electronic Kits, Components, Boards, Shields, Modules | Published: 2026-10-24
Category: Buying Guides
Compare SmartRFy 1, 2, and 4 channel relay modules to find the right wireless switch for your home automation project.
Quick answer
Choose a SmartRFy relay module by matching the number of channels to the devices you need to switch independently. The 1-channel module works for a single load, the 2-channel handles two separate circuits, and the 4-channel suits multi-zone or multi-device setups.
How SmartRFy relay modules work
All SmartRFy relay modules are part of a wireless system where one module can trigger another without any configuration. For example, a PIR sensor connected to a SmartRFy digital TX module can switch a floodlight through a remote relay module. The channel count determines how many independent loads each relay module can control.
Price vs. channel count trade-off
The 1-channel module costs the least but limits you to one switched circuit. The 2-channel adds flexibility for a small price increase, while the 4-channel costs about 40% more than the 1-channel but gives four times the switching capacity. Buying more channels than you need wastes money; buying too few means adding another module later.
Decision rules
- Pick the 1-channel module when: You need to switch exactly one device at a remote location and want the lowest entry cost. Check if your load exceeds the relay rating before ordering.
- Pick the 2-channel module when: You need to control two separate circuits independently, such as a light and a fan, or two zones from one module. Plan your wiring so each channel connects to a distinct load.
- Pick the 4-channel module when: You have three or more independent loads to switch, or you expect to expand later without adding another module. Consider future needs; a 4-channel module now may save cost and space later.
Product facts
- SmartRFy 4 Channel Relay Module: The SmartRFy 4 Channel Relay Module can remotely switch electrical devices via other SmartRFy modules without configuration. Useful for controlling multiple lights, pumps, or alarms from a single module, reducing wiring and module count.
SmartRFy 4 Channel Relay Module - SmartRFy 1 Channel Relay Module: The SmartRFy 1 Channel Relay Module is the most affordable option in the series and works with other SmartRFy modules for remote switching. Ideal for a single-point application like a gate release or one floodlight where extra channels would be unused.
SmartRFy 1 Channel Relay Module
Who should buy which?
Best for
- Simple on/off control of a single device like a floodlight or gate opener
- Independent control of two separate circuits from one module
- Multi-zone or multi-device automation where each load needs its own switch
Not for
- Projects requiring dimming or variable speed control
- Systems that need wired Ethernet or Wi‑Fi connectivity instead of RF
