ESPHome-Devices

Sinilink XY-WFUSB USB Switch Relay

Sinilink XY-WFUSB USB Switch Relay

This device can be found on Aliexpress for about 5 USD.

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Flashing

The case can be pried open without too much difficulty. Be careful to keep both halves as parallel as possible to not break the pins that hold them together.

Flashing must be done by connecting an FTDI adapter to the 1mm pads close to the USB female port. Here is the pinout:

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The pads are small, so this is a bit tricky. I did it with some sewing pins stuck into dupont wires. It could be done as well connecting alternating pins from either side of the board.

GPIO0 has to be connected to GND to enter programming mode.

GPIO Pinout

PinFunction
GPIO00?
GPIO01?
GPIO03?
GPIO04Toggle Button
GPIO05Relay and Red LED
GPIO14Green LED
GPIO16Blue LED

Basic Config

The following configuration mimics this Tasmota template string.

The green LED is turned on when the relay is off and vice versa. The blue LED is used as the status LED. The button toggles the state of the relay.

I had to increase the ap_timeout, this board seems to take some time to connect to the WiFi.

substitutions:
devicename: usb_relay
upper_devicename: "USB Relay"
esphome:
name: $devicename
platform: ESP8266
board: esp01_1m
wifi:
...
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
...
ap_timeout: 3min
...
status_led:
pin:
number: GPIO16 # Blue LED
switch:
# Relay
- platform: gpio
id: relay
pin: GPIO5
# Green LED
- platform: gpio
pin: GPIO14
id: green_led
inverted: true # start on
# Switch template to link relay and green LED states
# LED is on when relay is off
- platform: template
id: "${devicename}_relay"
name: $upper_devicename
lambda: |-
if (id(relay).state) {
return true;
} else {
return false;
}
turn_on_action:
- switch.turn_on:
id: green_led
- switch.turn_on:
id: relay
turn_off_action:
- switch.turn_off:
id: green_led
- switch.turn_off:
id: relay
# Button
binary_sensor:
- platform: gpio
id: button
pin:
number: GPIO04
mode: INPUT_PULLUP
inverted: True
on_press:
- switch.toggle: "${devicename}_relay"

If the USB Relay controls a light, it can also be implemented like this:

output:
# Relay
- platform: gpio
id: relay
pin: GPIO5
# Green LED
- platform: gpio
pin: GPIO14
id: green_led
inverted: true # start on
# Binary Output template to link relay and green LED states
# LED is on when relay is off
- platform: template
type: binary
id: "${devicename}_relay"
write_action:
if:
condition:
lambda: return state;
then:
- output.turn_on: relay
- output.turn_on: green_led
else:
- output.turn_off: relay
- output.turn_off: green_led
# Button
binary_sensor:
- platform: gpio
id: button
pin:
number: GPIO04
mode: INPUT_PULLUP
inverted: True
on_press:
light.toggle: $devicename
light:
- platform: binary
name: $upper_devicename
id: $devicename
output: "${devicename}_relay"
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