AMRUSB-1 Logging from Raspberry Pi

This Python script will log readings received from a Grid Insight AMRUSB-1 to Amazon AWS Dynamo DB.

I have no affiliation with Grid Insight; this is code I created for my own purposes.

Dependencies

sudo apt-get install python-setuptools
sudo easy_install pyserial 
sudo easy_install pip
sudo pip install boto

Amazon Dynamo DB Setup

In Amazon Dyanmo DB, create a new table called readings with the following settings:

Table Name: 	readings
Primary Hash Key: serialnumber (Number)
Primary Range Key: datestamp (Number) 
Provisioned Read Capacity Units: 1
Provisioned Write Capacity Units: 	1

Installation

Put the amrusb.py Python script into /home/pi/amrusb and then:

sudo mkdir /var/log/amrusb

In the file /etc/boto.cfg put Amazon AWS credentials with privileges sufficient to create Dynamo DB items in the table you created above:

[Credentials]
aws_access_key_id = ACCESS_KEY_GOES_HERE
aws_secret_access_key = SECRET_ACCESS_KEY_GOES_HERE

Copy the amrusb shell script into /etc/init.d and then:

sudo chmod +x /etc/init.d/amrusb
sudo update-rc.d amrusb defaults

This will ensure that the logging script starts as a daemon on boot.

Test

First, make sure that the script works when run from the command line:

sudo /home/pi/amrusb/amrusb.py

Leave this running, and watch the log:

tail -f /var/log/amrusb/amrusb.log

Where you should see something like this:

2014-09-07 19:49:04,678 - DaemonLog - INFO - Starting amrusb daemon
2014-09-07 19:49:04,682 - DaemonLog - INFO - Opening device /dev/ttyACM0
2014-09-07 19:49:04,684 - DaemonLog - INFO - Connected to Amazon Dynamo DB
2014-09-07 19:49:36,408 - DaemonLog - INFO - $UMSCM,24543136,7,1764501*6E
2014-09-07 19:50:00,033 - DaemonLog - INFO - $UMSCM,26080514,8,31849*6A

For any SCM line -- those starting with $UMSCM -- you should see data in the Amazon Dynamo DB table you created.

Launching on Boot

If all of the above works properly, then:

sudo /etc/init.d/amrusb start

And you should see similar log items.

If you got this far, then you should be able to reboot, and you should find that, on reboot, the amrusb.py script is running: