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Send Emails from the Raspberry PI

This is a quick example, in order to present the way to use it in other projects.

To build it

  • Clone the repo as usual.
  • Then
 cd PI4J.email
 ../gradlew --daemon clean shadowJar

Run the example

This shows how to send emails, and how to listen to emails, expecting a special one to stop the program.

The example provided here assumes that you have enabled the camera on the Raspberry PI, and started the script named motion.sh as follow:

 sudo ./motion.sh &

This command takes a snapshot named snap.jpg every 10 seconds.

Then, you need to provide your email account(s) information, in a file like email.properties.sample.

Make a copy of this file, named email.properties, and provide your account(s) info. This link might help.

Then you can run the command

 ./run -send:google -receive:yahoo -sendto:me@home.net,you@somewhere.else

This will send several emails to the google account (as defined in your email.properties), and listen to the emails in the yahoo account. The sent emails will have the snap.jpg attached to it.

The program is finally sending an exit email, that terminates the program, managed by the EmailReceiver. The first email is a read-loud one, that will be read out loud if you have installed espeak and connected a loudspeaker on the Raspberry PI.

To install espeak on the Raspberry PI:

 $ sudo apt-get install espeak

Another example, remote battery monitoring

This project intends to monitor a battery in a remote place (like a boat, an RV, etc) that has a network connection access though.

You need a small device like the one below: Battery PCB Fritzing diagram available here.

Look in the file ADCReader.java, you can run it from the script named runvolt:

 ./runvolt -send:google -sendto:me@home.org -loop:24h

It will constantly read the battery's voltage, and sent an email every 24 hours, looking like

 At Sun Jan 15 11:29:45 PST 2017, voltage was 13.40 Volts.

If the battery to monitor is in a location without a network access, then maybe the FONA option is to be considered. See the FONA directory.