KAmod RPi Relay4 SSR
From Kamamilabs.com - Wiki
Description
KAmod RPi 4RELAY SSR - 4-Channel SSR Relay Module for Raspberry Pi
This module was designed as a HAT overlay for Raspberry Pi and is equipped with four solid-state relays (SSR), suitable for switching alternating current (AC) circuits with a maximum load of 2 A and a voltage of 240 V AC. Compared to electromechanical relays, SSRs do not contain mechanical components as they are built from semiconductor elements (optocouplers and thyristors/triacs). They offer higher switching speeds, longer lifespan, and silent operation. The board includes surge protection components and LEDs signaling the relay activation status. The module is ideal for home automation projects, lighting systems, or garden installations.
Basic Features and Parameters
- 4x relay outputs - OMRON G3MB with built-in snubbers
- Built-in SIOV varistors (surge current: 400 A)
- Switching method: Zero-cross
- Output load capacity:
- 0.1...2 A / 100...240 V (AC), 50...60 Hz,
- Operating voltage range: 75...264 V,
- Peak current: 30 A (@ 60 Hz, 1 cycle).
- LEDs signaling relay activation status
- ARK screw terminals
- Jumpers allowing disconnection of the relay from the GPIO port
Standard Equipment
| Code | Description |
|---|---|
| KAmod RPi Relay4 SSR
|
Assembled and tested module |
| Mounting Kit |
Set of screws and spacers for attaching the HAT to the Raspberry Pi board |
Schematic
Assignment of Inputs and Outputs to Raspberry Pi GPIO Lines
| Raspberry Pi Pin | KAmod RPi Relay4 SSR |
|---|---|
| GPIO23 | CH1 / OUT1 |
| GPIO22 | CH2 / OUT2 |
| GPIO27 | CH3 / OUT3 |
| GPIO17 | CH4 / OUT4 |
The GPIO line outputs are connected to the control circuit via a jumper, allowing the corresponding pins to be disconnected if necessary.
Setting a high logic state ("1") activates the given relay. Relay activation is signaled by the LED lighting up on the corresponding channel.
Signaling LEDs
| LED | Function |
|---|---|
| CH1 |
|
| CH2 |
|
| CH3 |
|
| CH4 |
|
| PWR |
|
The module is equipped with 4 LEDs CH1-CH4 signaling relay activation, as well as an additional PWR LED indicating the presence of power supply voltage.
Relay Outputs
The relay contact outputs are routed to screw terminals that allow for the connection of both stripped wire ends and wires with crimped ferrules.
Module Installation on the Raspberry Pi Connector
Connection Example
