Here is a real time clock based on the DS3234 Real Time Clock IC. The DS3234 is a low-cost, extremely accurate SPI bus real-time clock with an integrated temperature-compensated crystal oscillator and crystal. The RTC maintains seconds, minutes, hours,...

A breakout board with 8 channel 5V DC relay. The control signal is DC 5V - 7.5V.  It can control 10A 250VAC, 10A 30VDC load. Size: 90mm X 70mm X 20mm. The major component is EL817 and SRD-DV5V-SL-C.   Features:   Outputs have LED...