.. | ||
.github | ||
examples/HC4052_demo | ||
test | ||
.arduino-ci.yml | ||
CHANGELOG.md | ||
HC4052.h | ||
keywords.txt | ||
library.json | ||
library.properties | ||
LICENSE | ||
README.md |
HC4052
HC4052 is an Arduino library for a HC4052 2 x 4 channel multiplexer.
Description
HC4052 is a library to control the CD74HC4052 2 x 4 channel multiplexer / demultiplexer and compatible devices.
The HC4052 allows e.g to multiplex an I2C bus (SDA+SCL) simultaneous to read multiple sensors that have a fixed address. Another application is to switch Serial (UNO has only one HW Serial) between different devices.
The channel selection is done with four select lines A, B, C.
The device can be enabled/disabled by the enable line INH.
Compatibles
- https://assets.nexperia.com/documents/data-sheet/74HC_HCT4052.pdf
- 74HC4052 (CMOS level)
- 74HCT4052 (TTL level)
To elaborate.
Related to
- 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)
Hardware connection
Typical connection is to connect the four select pins to four IO Pins of your board.
The optional enablePin (INH) must be connected to GND if not used. This way the device is continuous enabled.
Example multiplexing analog in.
processor HC4052
+-------------+ +-------------+
| | | |
| A |------------->| A X0 |
| B |------------->| B X1 |
| enable |------------->| INH X2 |
| | | X3 |
| analog in |<-------------| X |
| | | |
| analog in |<-------------| Y Y0 |
| | | Y1 |
| GND |--------------| GND Y2 |
| | | VCC Y3 |
| | | |
+-------------+ +-------------+
Interface
#include "HC4052.h"
Core
- HC4052(uint8_t A, uint8_t B, uint8_t enablePin = 255) constructor. Set the two select pins and optional the enable pin. If the enablePin == 255 it is considered not used.
- void setChannel(uint8_t channel) set the current channel. Valid values 0..3, this value is not checked, only the lower 2 bits will be used.
- uint8_t getChannel() get current channel 0..3.
Enable
These functions work only if enablePin is set in the constructor.
- void enable() idem.
- void disable() idem.
- bool isEnabled() idem. Also returns true if enablePin is not set.
Future
Must
- keep in sync with HC4067 et.al.
Should
- check channel in setChannel() ?
- return true if in range, false otherwise.
- performance measurements (UNO)
Could
- add examples
- i2c scan ?
- performance
Wont
Support
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Thank you,