8 leds output
8 leds output - 8 bits - leds
Fig. 1 8 leds output
Description:
This board outputs on leds the 8 bits of an 8 bits port.
Each bit of the port drives a led.
The board can be powered by 2.5 to 5V processor board.
Specifications:
Input voltage2.5 to 5V
Interface8 bits
Schematic:
The schematic is extremely simple. Each bit of the port drives a led through a resistor. The resistor used depends on the led and power supply. I selected 3mm low current red leds, with a 1.6V drop across them, and went for 1.5k resistors, which will give between 0.6 and 2.3 mA in the leds. The leds selected are given for 1mA typically.
Fig. 2 8 leds output schematic
Construction:
The PCB fits on a small single sided board. All components are on the top side.
Fig. 3 8 leds output layout
Once all the components are soldered, the board is ready.
Pads 1 to 4 can be drilled to 3mm to fix the board, or put spacers.
| 8 leds output Component list |
|---|
| R1, R2, R3, R4, R5, R6, R7, R8: 1.5 K R9: resistor's lead LED 1 to 8: 3mm red low current K1: Connector AMP MT 10pins male |
How to use / Testing:
To check the board, you need a processor board running tutorial 1 - counter.
Files and links:
Eagle PCB and schematics files for 8 leds output.PDFs of PCB, layout and schematics of 8 leds output.
PIC Tutorials 1 with 8 leds output board.