7-sensor-led

This app plots the values a potentiometer and turns on an LED if a voltage threshold is crossed

Setting up the hardware

I used an arduino mega for this example, but any of the boards supported by johnny-five should work.

Connect an LED directly to pin 12 and a potentiometer to A0

Setting up the code

To run, first clone the repo and npm install the example directory

git clone https://github.com/sofroniewn/electron-johnny-five-examples
cd electron-johnny-five-examples/7-sensor-led
npm install

Unfortunately the serial port may not work right away and might need to be rebuilt

./node_modules/.bin/electron-rebuild

At this point if you try to starting the app with

npm start

You may get an error if the path to serialport.node is wrong

Uncaught Error: Cannot find module '/Users/sofroniewn/github/electron-johnny-five-examples/1-led/node_modules/johnny-five/node_modules/serialport/build/Release/node-v47-darwin-x64/serialport.node'

This can easily be fixed by

mv ./node_modules/johnny-five/node_modules/serialport/build/Release/electron-v0.36-darwin-x64/ ./node_modules/johnny-five/node_modules/serialport/build/Release/node-v47-darwin-x64/

You're now ready to run the app!

For more information about that error and using electron with johnny-five and node-serialport in general, check out this super helpful blog post by @noopkat

Running the app

After setting up the hardware and the code you are now ready to run the app with

npm start

Once the board has been found and the green status light in the top right has turned on, you should be able to click the start button in the top left corner. Sensor values will then start being acquired and plotted to the screen using a lightning vizualization. If these values exceed a threshold the LED will turn on.

Congrats! Check out the next example 8-sensor-strobe