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This app allows you to output a strobe at different frequencies and plots the values of analog sensor

Setting up the hardware

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

Connect a loopback wire from pin 11 to A1

Setting up the code

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

git clone
cd electron-johnny-five-examples/8-sensor-strobe
npm install

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


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. Pin 11 will then start to output a strobe at a frequency defined by the input box. Change the value of this input to change the frequency of the pulses. The sensor values will also be acquired and plotted to the screen using a lightning vizualization. As long as Pin 11 is connected to A1 the orange sensor values should follow the red pulses.

Congrats! Check out the next example 9-sensor-log