XY-WJ01 relay timer with LCD display - 9 modes 6-30V + UART

XY-WJ01 relay timer with LCD display - 9 modes 6-30V + UART

The XY-WJ01 time delay relay is an advanced module featuring a precise countdown circuit and a clear LCD display. The device is ideal for controlling electrical circuits. It offers 9 operating modes (from P0 to P9), enabling a wide range of applications, including delayed shut-off, cyclic switching, or response to a change in signal level. The module is compatible with popular platforms: Arduino, ESP8266, ESP32, and Raspberry Pi.

Key technical specifications

• Supply voltage: 6V - 30V DC
• Trigger signal (high level): 3V - 24V
• Trigger signal (low level): 0V - 0.2V
• Maximum contact load: 30V 5A DC / 230V 5A AC
• Current consumption: 50mA during operation
• Delay adjustment: from 0.01 s to 9999 minutes
• Communication: UART interface (9600, 8, 1)
• Galvanic isolation: built-in optocoupler
• Dimensions: 79 mm x 43 mm x 27 mm (mounting hole 40 mm x 73 mm)
• Operating temperature: -40°C to 85°C

Example applications

• Automatic lighting control when a sensor signal is detected.
• Delayed switching of fans or pumps in cooling systems.
• Cyclic operation of feeders or valves in industrial automation.
• Protecting equipment against sudden voltage spikes by delayed start.
• Working with microcontrollers (Arduino, Raspberry Pi) in smart home projects.

Benefits

• High precision: time can be set with 0.01 second accuracy.
• Safety: galvanic isolation protects the control circuit from interference.
• Ease of use: the clear LCD display makes parameter configuration easy.
• Reliability: automatic saving of settings after power loss and relay life up to 100,000 switching cycles.
• Energy efficiency: automatic screen dimming after 5 minutes of inactivity.

Timer settings and time ranges

The module allows flexible configuration of operating time depending on the decimal point position on the display:

• XXXX: no dot - range from 1 s to 9999 s.
• XXX.X: one dot - range from 0.1 s to 999.9 s.
• XX.XX: dot indicates hundredths - range from 0.01 s to 99.99 s.
• X.X.X.X: three dots lit - range from 1 min to 9999 min.

For example, to set the on-time (OP) to 4.5 seconds, move the decimal point to the XXX.X position, which will display 004.5 on the LCD screen.

Parameter settings and operating modes

Configuration is done using the panel buttons. The main parameters are: OP (on-time), CL (off-time), and LP (number of repeats, where "----" means infinite).

1. Press and hold SET to enter the settings menu.
2. Use the UP/DOWN buttons to select the operating mode.
3. Short press SET to confirm the mode and switch to parameter editing.
4. In OP/CL edit mode, press POWER/PAUSE/TRIGGER to change the time unit.
5. Save settings by holding SET for more than 3 seconds.

Operating mode description (P0 - P9)

• P0: Relay turns on for time OP after a signal. Retriggering is ignored.
• P1: Relay turns on for time OP after a signal. Retriggering resets the countdown.
• P2: Relay turns on for time OP after a signal. Retriggering turns the relay off.
• P3: Relay on by default, turns off for time CL after a signal.
• P4: Relay turns on for time OP, then off for time CL. Signal interrupts the cycle.
• P5: After power-on, off for time CL, on for time OP, repeats LP times. Signal interrupts the cycle.
• P6: After power-on, on for time OP, off for time CL, repeats LP times. Ignores signal.
• P7: After power-on, off for time CL, on for time OP, repeats LP times. Ignores signal.
• P8: Relay turns on for time OP after a signal, then off. Signal resets the counter.
• P9: Relay turns off for time CL after a signal, then on. Signal resets the counter.

UART communication

The module allows remote control and reading of parameters via the UART interface (parameters: 9600, 8, 1). Available commands include READ (read settings), OP (set on-time), CL (set off-time), LP (set cycles), START/STOP, and PX (change operating mode).