@rakwireless/adc121c021

The node-red-contrib-adc121c021 node allows users to read analog inputs from adc121c021 and then convert them to digital readings.

Install from Node-RED

From within NodeRED, visit the top right menu, select Manage palette and then the Install tab. Look for @rakwireless/adc121c021 and install it.

Manual installation (development)

Please install @rakwireless/adc121c021 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://git.rak-internal.net/product-rd/gateway/wis-developer/rak7391/node-red-nodes.git

then copy node-red-contrib-adc121c021 directory to the node_modules directory,

cp -rf node-red-nodes/node-red-contrib-adc121c021 ~/.node-red/node_modules

lastly, change to the node-red-contrib-adc121c021 directory and install the node,

cd ~/.node-red/node_modules/node-red-contrib-adc121c021 && npm install

Tips: After the installation of @rakwireless/adc121c021 is finished, please restart your node-red service. Otherwise, the node cannot be found/added to the new flow.

Usage

Tips: Please make sure that user has the permissions to access GPIO and i2c devices.

• adc121c021_i2c

​ To get the voltage reading from the adc121c021, user only need to define the i2c bus of the chip.

​ Name

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

​ /dev/i2c-?

​ Default I2C Bus is 1. 1 is for '/dev/i2c-1'.

​ i2c_Address

​ The Address by default is set to 0x51, this is the I2C address of RAK12004. Please check adc121c021's datasheet for more information.

​ The output of the node is showed as follows.

{
	i2c_address: 81

	i2c_device_number: 1

	Raw_value: 2350

	Volts:  "2.869"
}

Example

• rak12004-reading - Read smoke PPM using WisBlock sensor RAK12004.
• rak12009-reading - Read Alcohol Gas PPM Using WisBlock Sensor RAK12009.

License

This project is licensed under MIT license.