GY-63_MS5611/libraries/74HC138

74HC138

Arduino library for the 74HC138 3-to-8 line decoder/demultiplexer.

Description

This library controls the 74HC138 3 to 8 line decoder. With 3 IO lines one can select one of 8 output lines.

Related

• https://github.com/RobTillaart/74HC154 (4 to 16 selector)
• https://github.com/RobTillaart/HC4051 (1x8 mux)
• https://github.com/RobTillaart/HC4052 (2x4 mux)
• https://github.com/RobTillaart/HC4053 (3x2 mux)
• https://github.com/RobTillaart/HC4067 (1x16 mux)

Interface

#include "74HC138.h"

Constructor

• 74HC138(uint8_t pin0, uint8_t pin1, uint8_t pin2, uint8_t pinEnable = 255) set the 3 selection IO lines from pin numbers. Optionally set the enable pin, connect to E1 or E2, see datasheet.
• 74HC138(uint8_t * pins, uint8_t pinEnable = 255) set the 3 selection IO lines from an array. The pins array should have at least 3 elements. Optionally set the enable pin, connect to E1 or E2, see datasheet.

Select line

• bool setLine(uint8_t line) set line 0 .. 7. Returns false if out of range.
• uint8_t getLine() returns 0 .. 7
• void nextLine() selects the next line, wraps back to 0 is needed.
• void prevLine() selects the previous line, wraps to 7 is needed.

Enable

Works only if enable line is set in constructor.

• void enable() enables output / selection.
• void disable() disables output / selection.
• bool isEnabled() checks if line is enabled.

Future

Must

• improve documentation
• get hardware to test

Should

Could

Wont

Support

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Thank you,