ESH10000589 - 4 DPDT Relay Module

Overview

The ESH10000589 is a relay switching module providing 4 double-pole double-throw (DPDT) relays with LED status indication and adjustable luminance control.

Description

The 4 DPDT Relay Module offers four high-quality DPDT relays suitable for signal routing, switching, and isolation applications. Each relay features break-before-make operation and integrated LED status indication.

Key Features:

• 4 DPDT Relays: Double-pole double-throw configuration

  • Break-before-make switching
  • Suitable for signal and low-power switching
  • Individual relay control
  • LED status indication per relay

• LED Control: Configurable status LEDs

  • Adjustable luminance (0.0 to 1.0)
  • Per-relay status indication
  • RGB LED driver

Hardware Details

Relay Control:

• Chip: NXP PI4IOE5V6416 GPIO expander
• I²C Address: 0x20
• Control: Digital signals for relay coil drive
• Relay Type: DPDT (2 Form C)

LED Driver:

• Chip: TI LP5024 RGB LED driver
• I²C Address: 0x28
• Channels: 24 (8 RGB LEDs)
• LED Control: PWM-based intensity control

Channel Naming Convention

All channels follow the naming pattern: {ModuleIndex}.ESH10000589.{ChannelName}

Example: Module at position 0, relay 0 would be: 0.ESH10000589.RELAY0

User-Accessible Channels

Total User Channels: 5 (4 relays + 1 luminance control)

Channel Configuration

Relay Control

Each relay channel accepts boolean values:

• false: Relay open (de-energized, NC contacts closed)
• true: Relay closed (energized, NO contacts closed)

Luminance Control

Luminance channel accepts values 0.0 to 1.0:

• 0.0: LEDs off
• 1.0: Maximum brightness

Programming Interface

Set Relay State:

SetValues(
    new[] { "0.ESH10000589.RELAY0", "0.ESH10000589.RELAY1" },
    new[] { "true", "false" }  // Close RELAY0, open RELAY1
);

Adjust LED Brightness:

SetValues(
    new[] { "0.ESH10000589.LUMINANCE" },
    new[] { "0.5" }  // 50% brightness
);

Read Relay State:

string[] states = GetValues(new[] { 
    "0.ESH10000589.RELAY0",
    "0.ESH10000589.RELAY1"
});
// states[0] = "true" or "false"

Relay Switching Sequence

The module uses a 3-phase switching sequence to ensure break-before-make:

1. Make Phase: Energize relay coils (30ms)
2. Idle Phase: De-energize coils to minimize power consumption

This sequence occurs automatically on SetValues() or Update().

Best Practices

1. Batch relay operations: Use SetValues with multiple relays for synchronized switching
2. Allow settling time: Wait 30-50ms after switching before measuring signals
3. Minimize switching frequency: Relays have limited cycle life (typically 100k-1M operations)
4. Set appropriate luminance: Reduce LED brightness to minimize power consumption
5. Verify relay state after power-on: Relays default to open (de-energized) state

Module Initialization Sequence

On Reset(), the module performs:

1. Clear existing channel list
2. Create LED luminance control channel (default: 1.0)
3. Create relay device with GPIO expander and LED driver
4. Add 4 relay channels (RELAY0-RELAY3)
5. Reset hardware (all relays open)
6. Initialize LED driver