2021-01-29 06:31:58 -05:00
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/HT16K33/blob/master/LICENSE)
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[](https://github.com/RobTillaart/HT16K33/releases)
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2020-07-17 06:34:54 -04:00
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# HT16K33
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Arduino Library for HT16K33 I2C 4x7segment display
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2021-01-29 06:31:58 -05:00
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2020-07-17 06:34:54 -04:00
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## Description
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This library is for the Adafruit 4x7segment display with HT16K33 driver,
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http://www.adafruit.com/products/1002
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2020-11-27 05:16:22 -05:00
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This library is functionally less capable than Adafruits.
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However as it caches the values written to the display per position
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it is faster for writing on average. The actual gain depends on the
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application and of course the values.
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2020-11-27 05:16:22 -05:00
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## Perfomance
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Version 0.3.0 allows one to switch the caching on/off to enforce
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writing all positions e.g. in case of noisy I2C bus.
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The example **demo_cache.ino** measures the performance gain of caching
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for different I2C bus speeds.
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```
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Test on UNO, I2C.setClock(100000); // version 0.1.2
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0-9999 integers 3.960 sec
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0-65535 hexadecimal 23.685 sec
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Test on UNO, I2C.setClock(800000); // version 0.1.2
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0-9999 integers 1.223 sec
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0-65535 hexadecimal 6.350 sec
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2020-11-27 05:16:22 -05:00
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Test on UNO, I2C.setClock(100000); // version 0.3.0
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0-9999 integers 4.092 sec // ~3% slower due to robustness & cache control
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0-65535 hexadecimal 24.336 sec
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```
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2020-11-27 05:16:22 -05:00
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## Multiple display
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The library supports only one display. Using multiple displays (cascading) e.g. to
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display more than 4 digits must done by the user - see **demo_dual1.ino**.
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With dual display it is important to **setDigits()** for the displays correctly to
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get leading/trailing zero's correctly.
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2020-11-27 05:16:22 -05:00
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## Interface
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### Setup behaviour
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2020-11-27 05:16:22 -05:00
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- **HT16K33(address)** address is 0x70..0x77 depending on the jumpers A0..A2. **0x70** is default
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- **bool begin(sda, scl)** for ESP32, select I2C pins, initialize I2C and calls **reset()**.
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Returns false if device not seen on I2C bus.
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- **bool begin()** initialize I2C and calls **reset()**.
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Returns false if device not seen on I2C bus.
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- **bool isConnected()** Returns false if device not seen on I2C bus.
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- **void reset()** resets display
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- **void clearCache()** forced clearing of the cache, to be used to switch the cache off just for one write.
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- **void cacheOn()** enable caching, this is default behavior
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- **void cacheOff()** disable caching, will force writing to every position
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- **void displayOn()** enable display
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- **void displayOff()** disable display, fast way to darken display e.g. for energy consumption
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- **void brightness(val)** values (dim) 0..15 (bright)
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- **void blink(val)** values 0..3 0 = off
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- **void setDigits(val)** values 0..4, minimal number of digits shown, mandatory for large numbers on dual display.
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- **void suppressLeadingZeroPlaces(val)** obsolete, replaced by setDigits
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### Datatypes
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The bool return value indicates that the value displayed is in range.
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2021-05-26 09:01:19 -04:00
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- **void displayClear()** fill display with spaces => results in an empty display.
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- **bool displayInt(n)** values -999 .. 9999
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- **bool displayHex(n)** values 0000 .. FFFF
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- **bool displayDate(left, right, lz = true)** values 00.00..99.99 Date could be {month.day} or {day.hour}
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It uses **.** as separator. Optional the leading zero (lz)
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can be replaced by a space to look more natural e.g 1:54 iso 01:54
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- **bool displayTime(left, right, colon = true, lz = true)** values 00:00..99:99
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Time could be hh:mm or mm:ss or ss:uu (hundreds), it uses **:** as separator.
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Optional the colon is set to false (e.g. to simulate blink) and optional the leading zero (lz)
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can be replaced by a space to look more natural e.g 1:54 iso 01:54
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- **void seconds(seconds, colon, lz = true)** displays 00:00..99:99 units in seconds (or minutes) - splits % 60 : as separator
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Optional the colon is set to false (to simulate blink).
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Optional the leading zero (lz) can be replaced by a space to look more natural e.g 1:54 iso 01:54
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- **bool displayFloat(f, decimals = 3)** values -999..0.000..9999
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The number of decimals = 0,1,2,3 = default. When less decimals are displayed, the number will be right aligned.
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2020-11-27 05:16:22 -05:00
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2021-01-29 06:31:58 -05:00
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### Experimental
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These functions are new and still under investigation.
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- **bool displayFixedPoint0(float f)** displays values -999 .. 9999 without decimals.
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- **bool displayFixedPoint1(float f)** displays values -99.9 .. 999.9 with 1 decimals.
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- **bool displayFixedPoint2(float f)** displays values -9.99 .. 99.99 with 2 decimals.
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- **bool displayFixedPoint3(float f)** displays values 0.000 .. 9.999 with 3 decimals.
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### Special
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- **bool displayVULeft(val)** display used as sort VU meter, values 0..8 Vales > 8 are treated as 8 (but return false)
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- **bool displayVURight(val)** display used as sort VU meter, values 0..8 Vales > 8 are treated as 8 (but return false)
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### Lower level workers
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- **void display(uint8_t \*arr)** array of 4 bytes to control one 7seg display
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- **void display(uint8_t \*arr, uint8_t pt)** idem + pt = position of the digit with point (0..3)
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- **void displayColon(on)** 0 = off, all values other are on.
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- **void displayRaw(uint8_t \*arr, colon)** array of 4 bytes to control one 7seg display + colon flag
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### Debugging
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2020-11-27 05:16:22 -05:00
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- **void displayTest(uint8_t del)** debugging / test function
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- **void dumpSerial(uint8_t \*arr, uint8_t pt)** debugging equivalent of display.
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### Future
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**0.4.0**
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- **bool isDisplayOn()** and similar state functions
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- config byte: 4 bits brightness, 1 bit on off flag, 1 bit cacheflag, 2 blinkrate
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- **void setBrightness()** and **uint8_t getBrightness()**
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- **void setBlink()** and **uint8_t getBlink()**
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- **void getDigits()**
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- **FixedPoint()** regular (experimental in 0.3.2)
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- overflow flag ? or not decission
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**unknown**
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- VU metering using halve bars allows two VU from 0..8 **new**
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- VU metering using halve bars allows one VU from 0..17. extension of current VUleft/right
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- optimize the math if possible - performance and footprint. +float + int division
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- low level I2C error detection
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2020-07-17 06:34:54 -04:00
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## Operation
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See examples
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