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166 lines
5.3 KiB
Markdown
166 lines
5.3 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/M5ANGLE8/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/M5ANGLE8/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/M5ANGLE8/blob/master/LICENSE)
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[](https://github.com/RobTillaart/M5ANGLE8/releases)
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# M5ANGLE8
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Arduino library for M5 8ANGLE 8x12 bit potentiometers.
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## Description
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**Experimental**
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M5ANGLE8 is an Arduino class to read the potentiometers of the M5 8ANGLE module.
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It also provides means to write RGB values to the 9 LED's in the same module.
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The potentiometers can be read with 8 bit (faster) or 12 bit.
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Derived from these two resolutions this library also supports resolutions from 1 to 12 bit.
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So the range can be chosen to match your application.
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Furthermore the library can reverse the range from 0..n => n..0.
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The library has a wrapper function **selectionRead(channel, steps)** around the analogRead
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to make a selection between 0..steps-1.
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The library can read the state of the mini switch.
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The library can set the RGB value and brightness of the 9 LEDS.
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First tests are done and the library looks stable now.
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Missing is an interrupt signal e.g. on change.
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One has to poll all channels for changes which is not efficient.
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A single byte register that showed change since last read would allow to monitor
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all 8 potentiometers in one call.
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Feedback is welcome!
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#### I2C
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The address range is in theory from 0..127, however the I2C specification
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states it should be between 8 and 119 as some addresses are reserved.
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The default address is **0x43** or **67**.
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| clock | works | notes |
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|:-------:|:-------:|:--------|
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| 100 KHz | yes |
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| 200 KHz | yes |
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| 400 KHz | yes | max speed advised
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| 600 KHz | no |
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See log file performance sketch.
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#### Accuracy
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The potentiometers in my test setup were quite stable and have little noise.
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At 12 bit resolution I got most of the time 2 bits or less noise.
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The angle of 280° for 4095 values is 14~15 steps per degree,
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that makes it pretty difficult to set a value exactly.
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The update performance of LEDs looks stable up to 40x per second in total.
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Beyond that frequency some blocking effects occur.
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Roughly determined with led_demo.
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#### Related
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- https://github.com/RobTillaart/GAMMA
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- https://github.com/RobTillaart/map2colour
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- https://github.com/RobTillaart/M5Angle8
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- https://github.com/RobTillaart/M5ROTATE8
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## Interface
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```cpp
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#include "M5ANGLE8.h"
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```
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#### Constructor part
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- **M5ANGLE8(uint8_t address = M5ANGLE8_DEFAULT_ADDRESS, TwoWire \*wire = &Wire)** constructor.
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Default address = 0x43, default Wire.
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- **bool begin(int sda, int scl)** ESP32 et al.
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- **bool begin()** initialize I2C, check if connected.
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- **bool isConnected()** checks if address is on the I2C bus.
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- **bool setAddress(uint8_t address = M5ANGLE8_DEFAULT_ADDRESS)** set a new address for the device.
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Default 0x43.
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- **uint8_t getAddress()** convenience function.
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- **uint8_t getVersion()** get firmware version from device.
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#### Analog part
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- **uint16_t analogRead(uint8_t channel, uint8_t resolution = 12)**
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Read a potentiometer, resolution can be set from 1..12 bit, constrained.
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- **void setReverse(bool reverse)** reverse the range of the potentiometers.
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Default is false == 0..n (true == n..0) - think right turn.
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- **bool getReverse()** get the current setting.
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- **uint16_t selectorRead(uint8_t channel, uint8_t steps)** maps the analogRead upon 0..steps-1 steps.
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#### Input switch part
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- **uint8_t inputSwitch()** read status of the switch.
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#### LED part
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- **bool writeRGB(uint8_t channel, uint8_t R, uint8_t G, uint8_t B, uint8_t brightness)**
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Set the RGB value and brightness of a specific LED.
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channel = 0..8
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brightness - 0..100
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- **bool setAll(uint8_t R, uint8_t G, uint8_t B, uint8_t brightness)** set all LEDS.
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- **bool allOff()** switch all LEDs off.
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Returns true.
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## Future
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#### Must
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- improve documentation
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- keep in sync with **M5ROTATE8** where possible.
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#### Should
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- error handling
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- **bool writeBrightness(channel)**
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- **bool readRGB(channel, &R, &G, &B, &brightness)**
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- or **uint32_t readRGB(uint8_t channel)**
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- improve on return values of functions.
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- improve performance
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- faster **allOff()** writing 2x 16 bytes dedicated.
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- read all analog ports in one call. (array of values).
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- investigate address changes
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#### Could
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- add examples
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- complex wave generator (freq, p0..p6 7 harmonics)
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- digital lock - 4096^8 possibilities in theory. 256^8 = 2^64 is enough...
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even 8^8 = 16 million.
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switch => verify trigger
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- dynamic "multi-mapping", set 8 points to match a curve.
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- equalizer 2x4 band (stereo)
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- LED colour mapping green -> yellow -> red.
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- investigate pulsating LED, how much performance costs?
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- investigate "optimal" polling frequency
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- add unit tests
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#### Wont (unless)
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- write separate colour channels?
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- caching?
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- version (not interesting),
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- RGB values = 32 bytes
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