Fan and ventiallation control for use in the Agilatech Lynxari system
<script type="module">
import agilatechLynxariFanDevice from 'https://cdn.skypack.dev/@agilatech/lynxari-fan-device';
</script>
IoT Platform
This device driver is specifically designed to be used with the Agilatech® Lynxari® IoT Platform. Please see agilatech.com to download a copy of the system.
This device driver is designed to control a single ventilation fan. No assumptions are made as to the end use of the output, be it providing fresh air to a gerbil cage or exhausting explosive gasses from an industrial power plant. Therefore, it is up to the end user application to decide upon latency and frequency issues.
This device driver is designed to be consumed by the Agilatech® Lynxari® IoT system. As such, it is not really applicable or useful in other environments.
To use it with Lynxari, insert its object definition as an element in the devices array in the devlist.json file.
{
"name": "FAN",
"module": "@agilatech/lynxari-fan-device",
"options": {
"gpio": 23,
"manual_minutes": 20,
"limits": [
{
"name": "temperature",
"upper":25,
"lower":23
},
{
"name": "co2",
"upper": 8000,
"lower": 5000
}
]
}
}
The device config object is an element in the devlist.json device configuration file, which is located in the Lynxari root directory. It is used to tell the Lynxari system to load the device, as well as several operational parameters.
name is simply the name given to the device. This name can be used in queries and for other identifcation purposes.
module is the name of the npm module. The module is expected to exist in this directory under the node_modules directory. If the module is not strictly an npm module, it must still be found under the node_modules directory.
options is an object within the device config object which defines all other operational parameters. In general, any parameters may be defined in this options object, and most modules will have many several. This fan driver makes use of gpio, manual_minutes, and a limits array.
"gpio":
"manual_minutes":
"limits": [
{limit object} Contains three parameters: name, upper, and lower.
"name": The name of the parameter which shall have on/off control of the fan at defined limits. Note that this name MUST be identical to the name of the sensor parameter providing the data. For example, if a temperature sensor is being used to provide input for when to switch the fan on and off, if the temperature parameter is named 'temp1', then the name given in the limit object must also be 'temp1'.
"upper":
"lower":
Note that upper and lower can be the same number. If the given lower limit is greater than the upper however, it will be corrected to be equal to the upper.
Either in the .use statement or the config.json file, gpio must be defined to be the valid gpio pin number of the fan switch output. Note that this number may not be the same as the physical connector pin number on the board.
Every module released by Agilatech includes configuration in a file named 'config.json' and we encourage any other publishers to follow the same pattern. The parameters in this file are considered defaults, since they are overriden by definitions appearing in the options object of the Lynxari devlist.json file.
The construction of the config.json mirrors that of the options object, which is simply a JSON object with key/value pairs. Here is an example of an 'config.json' file which operates a fan controlled at GPIO 23, will stay on for 10 minutes when manually triggered, and defines two parameters, temperature and humidity to control the fan:
{
"name":"FAN",
"gpio": 23,
"manual_minutes": 10,
"limits": [
{
"name": "temperature",
"upper":25,
"lower":23
},
{
"name": "humidity",
"upper": 60,
"lower": 50
}
]
}
If not specified in the config object, the program uses the following default values:
All drivers contain the following 4 core properties:
In the on state, the driver software for this device monitors one value.
For this fan device, it is usual to disable streaming. However, if it is not disabled, while in the on state, the driver software continuously streams this value in isochronal fashion with a period defined by streamPeriod. Note that a streamPeriod of 0 disables streaming.
This device driver has a binary state: on or off. When off, no parameter values are streamed or available, and no commands are accepted other than the turn-on transition. When on, the device is operational and accepts all commands. The initial state is off.
turn-on : Sets the device state to on. When on, the device is operational and accepts all commands. Values are streamed, and the device is polled periodically to keep monitored values up to date.
turn-off : Sets the device state to off, When off, no parameter values are streamed or available, and no commands are accepted other than the turn-on transition.
data-input(param, value) : This transition allows environmental data to be passed to the fan, where it is evaluated against the upper and lower limits for the param. If the given value exceeds the upper limit, the fan is turned on, and likewise, if the value is less than or equal to the lower limit, turns the fan off. Again, note that the 'param' string MUST be identical to the name of the sensor parameter providing the data. For example, if a temperature sensor is being used to provide input for when to switch the fan on and off, if the temperature parameter is named 'temp1', then the string given in the param argument must also be 'temp1'.
timed-on : Turns the fan on for the number of minutes given by the manual_minutes. Defaults to 10 mintues if no configuration value is given. The fan will turn off after the specified minutes, unless some other environmental condition has signaled the fan to turn on.
change-output(level) : Change the current fan output according to the parameter level. The acceptable value for level is either high or low, which turns the fan on or off respectively.
toggle-output : Toggles the fan level to its compliment, i.e. high->low or low->high.
This driver is designed to run within the Lynxari IoT platform. While Lynxari will run on nearly any operating system, this driver employs UNIX-specific protocols and as such will run on the following operating systems:
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