ESP32 Relay Board 4 Channel

ESP32 Relay Board 4 Channel

ESP32-WROOM-32E  AC 220V DC 7-30V DC 5V Wifi Bluetooth NO NC COM Smart Home ESPHome IoT Pump Fan Ventilation Lamp Curtain

     This development board based on ESP32-WROOM-32E combines an ESP32 controller, four independent electromechanical relays and a power supply with a wide input range on a single board. The board can be operated directly from the 220/230V AC mains, and it can also be powered by a 7-30V DC or regulated 5V DC source. Only one of the supply options must be used.

     On each of the four relays, the Normally Open (NO), Common (COM) and Normally Closed (NC) connections are brought out separately to the terminal block. Thanks to the potential free relay contacts, AC or DC circuits different from the supply voltage of the board can be switched. It can be used in lighting, pump, fan, garage door, barrier, access control, computer power on-off, contactor driving and smart home projects.

     The ESP32-WROOM-32E module offers a dual core Xtensa LX6 processor running up to 240MHz, 2.4GHz 802.11 b/g/n WiFi, Bluetooth 4.2/BLE and, depending on the variant used on the board, 4MB Flash memory.

     Thanks to the GPIO connections, UART programming pins, IO0 programming button and reset button on the board, custom software based on ESPHome, ESP-IDF or Arduino can be developed. Since there is no USB socket or USB-UART converter on the product, an external USB-TTL converter with 3.3V logic level is required for the first programming. The product is not a ready to use relay device with a mobile application, it is a programmable development board.

Features:

•     ESP32 Relay Board 4 Channel
•     Microcontroller module:  ESP32-WROOM-32E
•     4MB Flash memory
•     ESPHome and Home Assistant support
•     AC supply:  90-250V AC, compatible with 220/230V mains
•     DC supply:  7-30V DC
•     Alternative Dc supply: Dc  5V
•     Number of relays:  4 pcs
•     Relay coil voltage: Dc  5V
•     Contact connections:  NO / COM / NC
•     Relay parameters: AC 250V 10A / DC 30V 10A relay output,
•     Relay current: 50mA
•     IO0 programming and reset buttons
•     Uart programming connection
•     Programming:  Uart, 3.3V logic level
•     Relay channel status leds
•     Onboard status led:  GPIO23
•     Relay 1:  GPIO32
•     Relay 2:  GPIO33
•     Relay 3:  GPIO25
•     Relay 4:  GPIO26
•     Operating temperature:  -20C  /  65C
•     4 pcs pcb mounting holes
•     Color: Blue
•     Dimensions: 78mm x 93mm
•     Weight:  92gr

Relay contact capacity: Maximum values of 10A 250V AC / 10A 30V DC are stated on the relay body. However, the continuous resistive load values and inductive load values in the datasheet for the Form C contacts of the Songle SRD series are lower. For this reason, the 10A value of the product should not be considered as a continuous operating value for every load type.

Warning: In long term applications, staying below 7A per channel is recommended. For motors, pumps, solenoids, transformers, compressors or loads that draw a high inrush current, contactors, fuses and arc suppression elements with suitable capacity must be used.

Pin descriptions:

•    220V LN terminal block
•    Dc 7-30V input terminal block (It can also be powered directly with 5V)
•    NO COM NC Relay output terminal blocks 

Relay pin connections:

• GPIO    Function
• GPIO32    Relay 1
• GPIO33    Relay 2
• GPIO25    Relay 3
• GPIO26    Relay 4
• GPIO23    Board status LED

     In the programming connection, the TX and RX lines are at 3.3V logic level. Serial communication signals with 5V logic level must not be applied directly to the ESP32 pins. To enter programming mode, GPIO0 is pulled to the low level and the board is reset or energized again.

3d printed enclosure support:

•     printables.com/model/1234260-esp32-relay-x4-module-enclosure-with-i2c-sensor-in/files
•     cults3d.com/en/3d-model/gadget/esp32-relay-board-x4

Areas of use

• Home Assistant and ESPHome smart home systems
• Lighting control over WiFi
• Garage door, barrier and electric lock control
• Pump, fan and ventilation automation
• Remote power on of a computer or server
• Irrigation and greenhouse automation
• Alarm and access control systems
• Contactor, bell or siren triggering
• Time controlled or momentary relay applications
• IoT and industrial prototyping projects

Package contents:

•    1 pcs  ESP32 Relay Board 4 Channel

ESPHome sample configuration:

In the current ESPHome configuration, variant: esp32 can be used for the classic ESP32; GPIO relays can be defined as gpio switch.

esphome:
  name: esp32-4-role
  friendly_name: ESP32 4 Channel Relay

esp32:
  variant: esp32
  flash_size: 4MB
  framework:
    type: esp-idf

switch:
  - platform: gpio
    pin: GPIO32
    name: "Relay 1"
    restore_mode: ALWAYS_OFF

  - platform: gpio
    pin: GPIO33
    name: "Relay 2"
    restore_mode: ALWAYS_OFF

  - platform: gpio
    pin: GPIO25
    name: "Relay 3"
    restore_mode: ALWAYS_OFF

  - platform: gpio
    pin: GPIO26
    name: "Relay 4"
    restore_mode: ALWAYS_OFF

status_led:
  pin: GPIO23