Description Board Control: Intermittent infinite loop Countdown switch relay Control time by STC stc15w202s MCU, fully reprogrammable. Lead out serial port pins, can reflash board firmware, programming guide can see here. Can set 0~999 seconds (16-17 minutes) after to turn on relay. (also can program to 999 minutes or maybe hours in more complex level) Also can set 0~999 after to turn off relay or hold on relay. Other Features: On board segment display to show timing. Input voltage 7-25V via 7805 linear regulator. On board songle SPDT relay 10A /28VDC or 240VAC. One relay signal led indictor, one power indicator. Two config buttons. On board jumper, set relay active voltage to 5V. Switching jumper can support other voltage relay. On board optical coupler, isolate relay signal. Use guide please see on this page.
