Materials:

• Jumper wire: x2
• 220 Ω resistor: x2
• Jumper wire to alligator clip: x2
• Breadboard: x1
• Arduino Due: x1
• USB-A to Micro-USB cord: x1
• Rochester Sensors 9840: x1 (can be purchased here) (Referred to as gauge)

Tools:

• Needle nosed pliers (for removing the gauge’s plug’s connector)
• Pokey tool (for removing the gauge’s plug’s connector)

Assembly:

• The gauge’s black wire is connected (via a jumper wire to alligator clip) to 5v. The white wire goes row 50.
• One resistor is connected to rows 45 and 50.
• One jumper wire is connected to row 45 and the analog read pin (I chose A7).
• One resistor is connected to rows 40 and 45.
• One jumper wire is connected to row 40 and GND.

Runnin the code:

• Open FuelGaugeReader.ino in the Arduino IDE
• Install the rosserial library from Tools > Manage Libraries
• Use the Arduino IDE to load the code into your board
• Run roscore in one terminal
• Run rosrun rosserial_python serial_node.py _port:=/dev/<your usb port> in another terminal
• To see the output, run rostopic echo /fuel_level_percent_full in another terminal