109 lines
2.7 KiB
Markdown
109 lines
2.7 KiB
Markdown
# HDC1000 Module
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| Since | Origin / Contributor | Maintainer | Source |
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| :----- | :-------------------- | :---------- | :------ |
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| 2015-03-07 | [Francesco Truzzi](https://github.com/ftruzzi) | [Francesco Truzzi](https://github.com/ftruzzi) | [hdc1000.lua](../../lua_modules/hdc1000/HDC1000.lua) |
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This Lua module provides access to [HDC1000](https://www.ti.com/lit/ds/symlink/hdc1000.pdf) I²C digital humidity and temperature sensor. It should also work with HDC1008 sensor bout this haven't been tested.
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!!! note
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This module requires `i2c` C module built into firmware.
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### Require
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```lua
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HDC1000 = require("HDC1000")
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```
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### Release
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```lua
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HDC1000 = nil
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package.loaded["HDC1000"] = nil
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```
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## HDC1000.setup()
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Function to setup the HDC1000 sensor.
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#### Syntax
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`HDC1000.setup(drdyn)`
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#### Parameters
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- `drdyn`: DRDYn pin number. If set to `false`, this feature will not be used and after each read request a 20ms delay will be added.
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#### Returns
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`nil`
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#### Example
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```lua
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local sda, scl = 3, 4 -- Pins 3 and 4 will be used
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local drdyn = 6 -- Pin 6 will be used to connect with DRDYn pin
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i2c.setup(0, sda, scl, i2c.SLOW) -- call i2c.setup() only once
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HDC1000.setup(drdyn)
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```
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## HDC1000.config()
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Function to configure various options of HDC1000 sensor.
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#### Syntax
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`HDC1000.config(address, resolution, heater)`
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#### Parameters
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- `address`: I²C sensor address. Default value is `0x40`.
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- `resolution`: Temperature and humidity sensor resolution. Can be set to 14 bits for both temperature and humidity (`0x00`), 11 bits for temperature (`0x40`), 11 bits for humidity (`0x01`) or 8 bits for humidity (`0x20`). Default value is `0x00`.
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- `heater`: Heater setting. `0x20` to enable and `0x00` to disable. Default value is `0x20`.
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#### Returns
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`nil`
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## HDC1000.getTemp()
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Reads the temperature from HDC1000 sensor.
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#### Syntax
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`HDC1000.getTemp()`
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#### Parameters
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None
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#### Returns
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Temperature in Celsius degrees.
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## HDC1000.getHumi()
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Reads the humidity value from HDC1000 sensor.
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#### Syntax
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`HDC1000.getHumi()`
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#### Parameters
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None
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#### Returns
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Humidity in percents.
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## HDC1000.batteryDead()
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Function that checks if voltage of sensor power supply is bellow or above 2.8V.
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#### Syntax
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`HDC1000.batteryDead()`
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#### Parameters
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None
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#### Returns
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`true` if battery voltage is bellow 2.8V, `false` otherwise.
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#### Example
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```lua
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HDC1000 = require("HDC1000")
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sda = 1
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scl = 2
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drdyn = false
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i2c.setup(0, sda, scl, i2c.SLOW) -- call i2c.setup() only once
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HDC1000.setup(drdyn)
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HDC1000.config() -- default values are used if called with no arguments. prototype is config(address, resolution, heater)
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print(string.format("Temperature: %.2f °C\nHumidity: %.2f %%", HDC1000.getTemp(), HDC1000.getHumi()))
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HDC1000 = nil
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package.loaded["HDC1000"] = nil
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```
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