HiLetgo 12V 1 Channel Relay Module with Optocoupler Isolation Support High or Low Level Trigger

HiLetgo 12V 1 Channel Relay Module with Optocoupler Isolation Support High or Low Level Trigger

Module uses genuine high quality relay, normally open interface maximum load: AC 250V / 10A, DC 30V / 10A Using optocoupler chip isolation, strong drive capability, stable performance; trigger current 5mA Module can be set by jumper high or low trigger Fault-tolerant design, even if the control line is broken, the relay will not move The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient Module description:
Module Size: 50mm * 26mm * 18.5mm (L * W * H)
With four fixed bolt holes, holes 3.1mm, spacing 44.5mm * 20.5mm
Power Indicator (green), Relay Status Indicator (red)

Interface:
Input:
VCC: Relay power supply +
GND: Relay power supply -
IN: Signal trigger input (High or Low Level Signal, select via jumper)

Output:
NO: Relay normally open.
COM: Relay Common Pin
NC: Relay normally closed.

Package Included：
1*12V 1 Channel Relay Module With Optocoupler Isolation

How to provide an auto shut-down for Prusa i3 Mk2S?
1. Wired it in parallel with the power switch.
2. Use the hotend fan power as the trigger.
3. When you run a long print ,start the printer and when the hotend fan turns on (at about 50C) you can turn off the power switch.
4.The printer continues to run until the print is finished and the hotend cools below 50C. At that point the relay is no longer powered and the printer shuts itself off.