Four Relays four HV Inputs 8-Layer Stackable HAT for Raspberry Pi
Sequent Microsystems Four Relays Four
Sequent Microsystems Four Relays Four
Sequent Microsystems Four Relays Four
Sequent Microsystems Four Relays Four
Sequent Microsystems Four Relays Four

Four Relays four HV Inputs 8-Layer Stackable HAT for Raspberry Pi

$45.00

Stackable to 8 layers, the card can add up to 32 relays to each Raspberry Pi in a compact form factor. In addition, you can read up to 32 opto-isolated inputs.


Ships From: United States (US)
Supplier: Sequent Microsystems SKU: SM-I-010 Categories: , Tags: , , , , , More From:

Four Relays four HV Inputs 8-Layer Stackable HAT for Raspberry Pi

Drive 8A/240VAC loads and read 3V to 240V, AC or DC, opto-isolated inputs for all your Home or Industrial Automation Projects. It is the perfect add-on to your project when controlling heavy-duty AC loads and/or reading a wide range of inputs. Stackable to 8 layers, the card can add up to 32 relays to each Raspberry Pi in a compact form factor. In addition, you can read up to 32 opto-isolated inputs.

Technical Specifications

  • Status LEDs and NO/NC contacts
  • Switch loads of up to 8A and 240VAC/24VDC
  • Four high-voltage Opto-isolated inputs with status LEDs
  • Separate connectors for low (3V-30V) and high (30-240V) inputs
  • Digital inputs reading AC or DC signals
  • Eight-layer stackable to 32 relays and 32 inputs
  • RS485/MODBUS port
  • Raspberry Pi reset push button
  • Pluggable Connectors 30-16 AWG wires
  • Uses only I2C port (address 0x15..0x0e), all GPIO pins available
  • Works with any Raspberry Pi from ZERO to 5
  • ECCN Code EAR99
  • Command Line
  • Python Drivers
  • Node-Red node and examples
  • OpenPLC module
  • Arduino Library
  • Home Assistant Integration

Pluggable connectors make the card easy to use when multiple cards are stacked. All relays have Normal Open and Normal Close contacts and can switch to 8A/240VAC. The optically isolated inputs can read AC or DC signals from 3V to 240V. The input connectors have a low-voltage port, which can read signals between 3V and 30V, and a high-voltage port, which can read signals between 30V and 240V AC or DC.

Compatibility

The Four Relays card is compatible with all Raspberry Pi versions from Zero to 5. All stacked cards share the I2C bus, using only two Raspberry PPi GPIO pins to manage all eight cards. This feature leaves the remaining 24 GPIOs available for the user.

Power Requirements

The Four Relays card needs 5V to operate and can be powered from the Raspberry Pi or its 2-pin pluggable connector. The 5V also powers the relay coils. The card draws 10mA with all relays off. Each relay needs about 80 mA to turn on. If power is applied to the 2-pin pluggable connector, no other power supply is needed for the Raspberry Pi.

Industrial Version

The INDUSTRIAL version of the Four Relays card accepts 5V or 10 to 24VDC power input. A step-down converter can supply 5V and up to 4A continuous, 5A peak to Raspberry Pi. No other 5V power supply is needed.

Stacking Multiple Cards

Up to eight cards Four Relays can be stacked on your Raspberry Pi. Each card is identified by jumpers you install to indicate the level in the stack. Cards can be installed in any order. A three-position jumper selects the stack level.

For your convenience, two jumpers are provided with each card.

Reset Push Button

Shutting down the Raspberry Pi by turning off the power can result in SD Card failure. A shutdown command must be used before the power cut-off to prevent this. However, this requires a monitor, keyboard, and mouse connected to the Pi.

A momentary push-button installed at the board’s edge provides a convenient way to shut down the Raspberry Pi. The local processor reads the button, which can be programmed to signal the Raspberry Pi by setting low pin 37 of the Raspberry Pi GPIO connector (GPIO26). You can also read the push button status from the I2C interface. You must write a script that monitors this pin and issues the shutdown command if pressed for more than the desired time.

Card Layout


Electrical Specifications

  • Power Supply: 5V/8A pluggable connector with reverse polarity protection
  • On board resettable fuse: 3A
  • Opto-isolated Digital Inputs:
    • Input Forward Current: Typical five mA, maximum 50 mA
    • Low Voltage Input Series Resistor: 2.2K
    • High Voltage Input Series Resistor: 120K
    • Isolation Resistance: Minimum 1012 Ω
  • Relays: NO/NC contacts, 8A/240 VAC-24 VDC

Mechanical Specifications

4-Relays 4-Inputs Card Mechanical Specifications

Relay Self Test

The card can be tested before installation by running a simple command from the command line. The card will cycle each relay on and off at 0.5-second intervals. The clicking noise of the relays and the lighting of the LEDs will ensure that all relays are functioning.

RS485/Modbus Port

A standard RS485 transceiver permits the Raspberry Pi to communicate using any protocol, including MODBUS, PROFIBUS, camera PTZ control, etc. The transceiver can be driven from the Raspberry Pi serial port or the local processor. Install the jumpers 485-TX and 485-RX on connector J3 to drive the port from Raspberry Pi. Install the terminator jumper 485-TERM if the card is last on the RS485 chain.

Extended Functions of The Input Ports

  • Transition counters to 4kHz on all inputs
  • Input counters with cumulative or PPS (pulse per second) reading up to 4kHz
  • 2 x Quadrature encoder inputs reading up to 4000 PPS
  • PWM inputs on each channel, reading both the fill factor and the frequency
  • 1% resolution on PWM inputs up to 100Hz, 5% resolution up to 500Hz.

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At Sequent Microsystems, we design Raspberry Pi HATS with analog and digital inputs and outputs, relays, solid-state drivers, Serial ports, OpenPLC, Node-RED, Codesys, Python, Arduino, and Command Line drivers. OEM and custom design inquiries welcomed.

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