@rakwireless/ltr-390uv

A node providing access to ltr-390uv, measuring and calculating lux and uvi(ultraviolet index).

Install from Node-RED

From within NodeRED, visit the top right menu, select Manage palette and then the Install tab. Look for @rakwireless/ltr-390uv and install it.

Manual installation (development)

Please install @rakwireless/ltr-390uv node with the following commands. If you use docker of Node-RED, you may need to replace ~/.node-red with /usr/src/node-red,

git clone https://github.com/RAKWireless/node-red-nodes.git

then copy node-red-contrib-ltr-390uv directory to the node_modules directory,

cp -rf node-red-nodes/node-red-contrib-ltr-390uv ~/.node-red/node_modules

lastly, change to the node-red-contrib-ltr-390uv directory and install the node,

cd ~/.node-red/node_modules/node-red-contrib-ltr-390uv && npm install

Tips: After the installation of @rakwireless/ltr-390uv is finished, please restart your Node-RED service. Otherwise, the node cannot be found/added to the new flow.

Usage

NOTE: Please make sure that user has the permissions to access i2c devices, otherwise user can not read from the ltr-390uv chip.

To get the lux and uvi reading from the ltr-390uv, you need to select the correct setting for @rakwireless/ltr-390uv node.

Name

Define the msg name if you wish to change the name displayed on the node.

/dev/i2c-?

The i2c bus number, the default value is 1 , it means '/dev/i2c-1'.

i2c_Address

The i2c slave address for the ltr-390uv, by default is set to 0x53.

gain

Define the als/uvs measuring gain range. the default value is 1x

resolution

Define the als/uvs measuring resolution, the default value is 16 Bit

The output of the node is a payload contains the raw als data, raw uvs data, the calculated lux and the calculated uvi.

Examples

• rak12019-reading - Measure lux and uvi using WisBlock UV sensor RAK12019 from Node-RED.

License

This project is licensed under MIT license.