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µP Displays 10 Bit Data on Three LEDs: 11/07/96 EDN-Design Ideas / (added 08/05) circuit in Figure 1 uses a PIC16C55
µP to read 10-bit binary data and directly display data in decimal format on three common-cathode LED displays. If value of data exceeds 999, displays show three hyphens
(---) to represent overflow. PIC16C55 has high drive capability. Each output pin can source 20 mA and sink 25 mA; outputs can thus directly drive LED display
8x8 Animated LED Signboard: The firmware supplied in current sourcecode archive is VERY BASIC. I do intend to draw
more patterns. However, a vast workload coupled with possible emigration has put finished firmware on hold. Please do go ahead and build this circuit though supplied firmware is
fully functional. You can have hours of fun designing your own patterns and effects! (project added 10/06)
9
Second Digital Readout Countdown Timer: This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is
preset to 9 and the 555 timer is disabled with the output.... (added 3/07)
Big 7-Segment LED Display Board with SPI Interface: The circuit uses a serial-in-parallel out shift register, 74HC595 for
receiving serial data from uController board. See example of U5 in schematic, SER is for data input, SRCLK is shift clock and RCLK is Latch clock. Each data bit is shifted into
register on rising edge of shift clock. When all data bits are shifted into 8-bit register, rising edge of RCLK will clock data to be latched at each output bit, i.e.
QA QH.... (added 4/05)
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