ESP32 Relay Board 2 Channel ESP32-2R-D5

ESP32 Relay Board 2 Channel

ESP32-WROOM-32E DC 7-50V / DC 5V Wifi Bluetooth NO NC COM Smart Home ESPHome IoT Pump Fan Ventilation Lamp Curtain

This product is not a ready-to-use WiFi relay with a mobile application. Software suitable for the project it will be used in must be loaded onto the ESP32. An external USB-TTL converter is required for the first programming.

     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 also be powered by a 7-50V DC or regulated 5V DC source. Only one of the supply options should be used.

     Each of the four relays has its Normally Open (NO), Common (COM) and Normally Closed (NC) connections brought out separately to a terminal block. Thanks to the potential-free relay contacts, AC or DC circuits different from the board supply voltage 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, but a programmable development board.

Features:

•     ESP32 Relay Board 2 Channel ESP32-2R-D5
•     Microcontroller module:  ESP32-WROOM-32E
•     4MB Flash memory
•     ESPHome and Home Assistant support
•     DC supply:  7-50V DC
•     Alternative dc supply: Dc  5V
•     Number of relays:  2 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:  GPIO16
•     Relay 2:  GPIO17
•     Operating temperature:  -20C  /  65C
•     4 pcb mounting holes
•     Color: Blue
•     Dimensions:  48mm x 74.3mm
•     Weight:  38gr

Relay contact capacity: Maximum values of 10A 250V AC / 10A 30V DC are given on the relay body. However, the continuous resistive load values and inductive load values in the data sheet 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 drawing high inrush current, contactors, fuses and arc suppression components with suitable capacity should be used.

Pin descriptions:

•    Dc 7-30V input terminal (Can also be powered directly with 5V)
•    NO COM NC relay output terminals 

Relay pin connections:

• GPIO16    Relay 1
• GPIO17    Relay 2
• GPIO23    Board status LED

Programming connections:

• Board GND → USB-TTL GND
• Board TX → USB-TTL RX
• Board RX → USB-TTL TX
• Board 5V → Suitable 5V supply
• Before loading the program, IO0 and GND are short-circuited and the product is restarted.

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 2 Channel ESP32-2R-D5

ESPHome example 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-relay-x2

esp32:
  variant: esp32

# LED exposed as binary light
output:
  - platform: gpio
    pin: GPIO23
    id: output_led

light:
  - platform: binary
    id: light_led
    name: LED
    output: output_led

# Relays exposed as switches
switch:
  - platform: gpio
    pin: GPIO16
    id: relay_1
    name: Relay 1

  - platform: gpio
    pin: GPIO17
    id: relay_2
    name: Relay 2