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0.1.6 CHT8305

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rob tillaart 2023-02-01 19:29:55 +01:00
parent 331a07ccdf
commit 5a4cc3f20a
11 changed files with 95 additions and 51 deletions
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2
libraries/CHT8305/.github/workflows/arduino-lint.yml vendored
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@ -6,7 +6,7 @@ jobs:
lint:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions/checkout@v3
- uses: arduino/arduino-lint-action@v1
with:
library-manager: update

2
libraries/CHT8305/.github/workflows/arduino_test_runner.yml vendored
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@ -8,7 +8,7 @@ jobs:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions/checkout@v3
- uses: ruby/setup-ruby@v1
with:
ruby-version: 2.6

2
libraries/CHT8305/.github/workflows/jsoncheck.yml vendored
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@ -10,7 +10,7 @@ jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions/checkout@v3
- name: json-syntax-check
uses: limitusus/json-syntax-check@v1
with:

9
libraries/CHT8305/CHANGELOG.md
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@ -5,14 +5,19 @@ All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).
----
## [0.1.6] - 2023-02-01
- update GitHub actions
- update license 2023
- update readme.md
- minor edits
## [0.1.5] - 2022-10-29
- fix changelog.md
- add readTemperature()
- add readHumidity()
## [0.1.4] - 2022-10-15
- add CHT8305_DEFAULT_ADDRESS (0x40).
- add CHANGELOG.md.

14
libraries/CHT8305/CHT8305.cpp
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@ -1,9 +1,9 @@
//
// FILE: CHT8305.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.5
// VERSION: 0.1.6
// PURPOSE: Arduino library for CHT8305 temperature and humidity sensor
// URL: https://github.com/RobTillaart/CH8305
// URL: https://github.com/RobTillaart/CHT8305
//
// HISTORY: see changelog.md
@ -109,7 +109,10 @@ int CHT8305::readTemperature()
uint16_t tmp = data[0] << 8 | data[1];
_temperature = tmp * (165.0 / 65535.0) - 40.0;
if (_tempOffset != 0.0) _temperature += _tempOffset;
if (_tempOffset != 0.0)
{
_temperature += _tempOffset;
}
return CHT8305_OK;
}
@ -130,7 +133,10 @@ int CHT8305::readHumidity()
uint16_t tmp = data[0] << 8 | data[1];
_humidity = tmp / 655.35; // == / 65535 * 100%
if (_humOffset != 0.0) _humidity += _humOffset;
if (_humOffset != 0.0)
{
_humidity += _humOffset;
}
return CHT8305_OK;
}

6
libraries/CHT8305/CHT8305.h
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@ -2,9 +2,9 @@
//
// FILE: CHT8305.h
// AUTHOR: Rob Tillaart
// VERSION: 0.1.5
// VERSION: 0.1.6
// PURPOSE: Arduino library for CHT8305 temperature and humidity sensor
// URL: https://github.com/RobTillaart/CH8305
// URL: https://github.com/RobTillaart/CHT8305
//
@ -12,7 +12,7 @@
#include "Wire.h"
#define CHT8305_LIB_VERSION (F("0.1.5"))
#define CHT8305_LIB_VERSION (F("0.1.6"))
// DEFAULT ADDRESS
#ifndef CHT8305_DEFAULT_ADDRESS

2
libraries/CHT8305/LICENSE
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@ -1,6 +1,6 @@
MIT License
Copyright (c) 2022-2022 Rob Tillaart
Copyright (c) 2022-2023 Rob Tillaart
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal

100
libraries/CHT8305/README.md
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@ -4,6 +4,7 @@
[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/CHT8305/blob/master/LICENSE)
[![GitHub release](https://img.shields.io/github/release/RobTillaart/CHT8305.svg?maxAge=3600)](https://github.com/RobTillaart/CHT8305/releases)
# CHT8305
Arduino library for CHT8305 temperature and humidity sensor.
@ -31,7 +32,7 @@ This prevents the need for continuous polling of the sensor.
#### Tests
- Temperature() and humidity() works on AVR.
- Temperature and humidity functions works on AVR.
- default about 14 milliseconds at 14 bit resolution.
- offset functions work.
- getVoltage() function works on AVR but meaning unclear.
@ -44,7 +45,7 @@ The reason is that the sensor I have does not expose the ALERT pin.
If you are able to test the ALERT functions, please let me know your experiences.
### Hardware
## Hardware
Always check datasheet for connections.
@ -67,23 +68,10 @@ Always check datasheet for connections.
// SCL WHITE
```
### Register map
See datasheet page 10 for details
| Address | Register name |
|:---------:|:---------------------------|
| 0x00 | CHT8305_REG_TEMPERATURE |
| 0x01 | CHT8305_REG_HUMIDITY |
| 0x02 | CHT8305_REG_CONFIG |
| 0x03 | CHT8305_REG_ALERT |
| 0x04 | CHT8305_REG_VOLTAGE |
| 0xFE | CHT8305_REG_MANUFACTURER |
| 0xFF | CHT8305_REG_VERSION |
Pull ups are needed on SDA, SCL and optional to ALERT.
### Alert
#### Alert
The CHT8305 has an ALERT logic output pin with an open drain structure.
This output is active low. (if the breakout supports this.)
@ -91,7 +79,12 @@ This output is active low. (if the breakout supports this.)
## I2C
I2C bus speeds supported up to 400 KHz.
#### performance
I2C bus speeds is supported up to 400 KHz.
#### Addresses
| AD0 | Address | Notes |
|:-----:|:----------:|:--------|
@ -105,25 +98,36 @@ Pull ups are needed on SDA, SCL and optional to ALERT.
## Interface
```cpp
#include "CHT8305.h"
```
#### Constructor
- **CHT8305(TwoWire \*wire = &Wire)** Constructor with default I2C bus.
- **int begin(const uint8_t address = CHT8305_DEFAULT_ADDRESS)** sets address, default = 0x40.
- **int begin(int sda, int scl, const uint8_t address = CHT8305_DEFAULT_ADDRESS)** idem ESP32 et. al.
- **bool isConnected()** checks if address can be seen on the I2C bus.
- **int begin(int sda, int scl, const uint8_t address = CHT8305_DEFAULT_ADDRESS)** idem for ESP32 et. al.
- **bool isConnected()** checks if address (default 0x40) can be seen on the I2C bus.
#### Core
- **int read()** reads both the temperature and humidity.
Can be called once per second.
- **int readTemperature()** read only temperature (slightly faster than read)
- **int readHumidity()** read only humidity (slightly faster than read)
- **uint32_t lastRead()** returns lastRead in MilliSeconds since start sketch.
Useful to check when it is time to call **read()** again, or for logging.
- **float getHumidity()** returns last humidity read.
Will return the same value until **read()** is called again.
Will return the same value until **read()** or **readTemperature()** is called again.
- **float getTemperature()** returns last temperature read.
Will return the same value until **read()** is called again.
Will return the same value until **read()** or **readHumidity()** is called again.
Note: read(), readTemperature() and readHumidity() blocks each other,
so you can call one of them every second.
so you can call only one of them every second.
### Conversion delay
#### Conversion delay
- **void setConversionDelay(uint8_t cd = 14)** default is 14 milliseconds (datasheet).
7 ms failed. 8 ms worked, so values below 8 are mapped to 8 in the library.
@ -132,10 +136,11 @@ It might be that lower resolutions allow shorter delays. This is not tested.
- **uint8_t getConversionDelay()** returns set value.
### Offset
#### Offset
Adding offsets works well in the "normal range" but might introduce
under- or overflow at the ends of the sensor range.
These are not handled by the library (yet).
- **void setHumOffset(float offset)** idem.
- **void setTempOffset(float offset)** idem.
@ -144,9 +149,10 @@ under- or overflow at the ends of the sensor range.
If the offset is not the same over the operational range,
consider a mapping function for temperature and humidity.
e.g. https://github.com/RobTillaart/MultiMap
### Configuration register
#### Configuration register
Check the datasheet for details of the register bits.
@ -170,7 +176,7 @@ Check the datasheet for details of the register bits.
| 1-0 | 0x0003 | reserved. | do not change.
#### Getters / setters config register
#### Getters / setters configuration register
Note: setting **setConfigRegister(bitmask)** can be faster.
@ -178,7 +184,7 @@ Wrapper functions for easy configuration.
- **void softReset()** sets the soft reset bit in the configuration, causing the sensor to reset.
- **void setI2CClockStretch(bool on = false)** check datasheet.
- **bool getI2CClockStretch()**
- **bool getI2CClockStretch()** check datasheet.
- **void setHeaterOn(bool on = false)** switch on internal heater.
Can improve humidity readings.
See datasheet for (limited) details.
@ -195,7 +201,7 @@ See datasheet for (limited) details.
- **bool getVCCenable()** idem.
### Alert
#### Alert
See register 3 datasheet page 12 for details.
@ -223,7 +229,7 @@ See register 3 datasheet page 12 for details.
The ALERT pin triggers with a falling edge (from HIGH to LOW).
### Voltage
#### Voltage
VCC measurement should be enabled by means of **void setVCCenable(true)**
or by **setConfigRegister(0x0004)**.
@ -236,19 +242,37 @@ Varied slightly 5.000 - 4.999 also for 3V3 power supply.
Conclusion: it is unclear how to interpret this register.
### Meta data
#### Meta data
- **uint16_t getManufacturer()** returns 0x5959.
- **uint16_t getVersionID()** return value may differ.
Test returned 0x8305.
#### Register map
See datasheet page 10 for details
| Address | Register name |
|:---------:|:---------------------------|
| 0x00 | CHT8305_REG_TEMPERATURE |
| 0x01 | CHT8305_REG_HUMIDITY |
| 0x02 | CHT8305_REG_CONFIG |
| 0x03 | CHT8305_REG_ALERT |
| 0x04 | CHT8305_REG_VOLTAGE |
| 0xFE | CHT8305_REG_MANUFACTURER |
| 0xFF | CHT8305_REG_VERSION |
## Future
- test (see below)
- elaborate documentation.
#### Must
#### test
- elaborate documentation.
- more testing (platforms)
#### Should
- test ESP32, other platforms?
- test performance.
@ -258,6 +282,14 @@ Test returned 0x8305.
- test ALERT functions.
- test write / readRegister with a single uint16_t to simplify code.
#### Could
- make offset functions "full name" e.g. **setHumidityOffset()** (0.2,0)
- fix offset over- underflow for humidity (can never exceed 0..100%)
- parameter testing
- parameter defaults?
#### Wont

2
libraries/CHT8305/library.json
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@ -15,7 +15,7 @@
"type": "git",
"url": "https://github.com/RobTillaart/CHT8305.git"
},
"version": "0.1.5",
"version": "0.1.6",
"license": "MIT",
"frameworks": "arduino",
"platforms": "*",

2
libraries/CHT8305/library.properties
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@ -1,5 +1,5 @@
name=CHT8305
version=0.1.5
version=0.1.6
author=Rob Tillaart <rob.tillaart@gmail.com>
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
sentence=Arduino library for CHT8305 temperature and humidity sensor.

5
libraries/CHT8305/test/unit_test_001.cpp
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@ -3,7 +3,7 @@
// AUTHOR: Rob Tillaart
// DATE: 2022-10-06
// PURPOSE: unit tests for the CHT8305 temperature and humidity sensor
// https://github.com/RobTillaart/CH8305
// https://github.com/RobTillaart/CHT8305
// https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
//
@ -31,6 +31,7 @@ unittest_setup()
fprintf(stderr, "CHT8305_LIB_VERSION: %s\n", (char *) CHT8305_LIB_VERSION);
}
unittest_teardown()
{
}
@ -138,4 +139,4 @@ unittest(test_setAlertLevels)
unittest_main()
// -- END OF FILE --
// -- END OF FILE --