xTimer with 4094

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Category: Microcontroller Circuits / AVR Microcontroller
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The original version of xTimer used MAX7219 for driving 7-segment. This new design uses a cheap CMOS shift register, 4094 for LED interface. Each 4094 drives a 0.5` 7-segment without the need of limiting resistor. The left-hand LED is timer function with buzzer alarm output. The right-hand is for clock display.Fig. 2 shows a complete hardware schematic. U2 is ATMEL 89C2051 running with 24MHz xtal. The original version uses 11.0592MHz, this version I need the accurate clock, so I chose 24MHz. Since the clock input to timer is 24MHz/12=2MHz. To produce 100Hz time visit page.

Fig. 2 shows a complete hardware schematic. U2 is ATMEL 89C2051 running with 24MHz xtal. The original version uses 11.0592MHz, this version I need the accurate clock, so I chose 24MHz. Since the clock input to timer is 24MHz/12=2MHz. To produce 100Hz time http://www.kmitl.ac.th/~kswichit%20/xtimer14094/xtimer1.html

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