UIgnite

A basic UI client made with Tkinter in python 2.7 for controlling engine ignition tests via XBee radios.
Built to work with the Arduino server.

Python Client

Running

To run, make sure your system satisfies requirements.txt and that you are running python 2.7

If you're not running python 2.7 and/or don't want to run python 2.7, you could always change Tkinter to tkinter in the import statement of application.py and it would probably work.

application.py takes 2 arguments in order to run: platform and port_number.

These parameters allow the UI to be used across all platforms with the USB explorer for the XBee radios.

Sample Runs:
python application.py u 7
This would result in the serial port trying to open at \dev\ttyUSB7

python application.py w 5
This would result in the serial port trying to open at COM5

Parameters

platform refers to the operating system you are running on.

port_number refers to the number of the COM port or ttyUSB you are connecting to on the host computer.

key	platform
u	unix (mac, linux,etc.)
w	windows
uw	bash on windows (build 16299 and later)

If you get permission issues on unix, try running it as superuser.

Arduino Server

Arduino code for wireless hybrid engine ignition test rig.

The igniter software is a state machine that is controlled by input from the serial port.
In our case, the serial port is used by an XBEE pro 900HP radio, giving us wireless control of the igniter.

State Machine

The state machine has 6 states it can be in, each corresponding to a number:

State	Number	Green LED	Red LED	Action
`STOP`	1	ON	OFF	Close the valve, turn the igniter relay off.
`IGNITE`	2	OFF	ON	Turn the igniter relay on, starting the igniter.
`OPEN`	3	ON	ON	Keep the igniter relay on, open the valve, keep it open for 10 seconds
`CLOSE`	4	ON	OFF	Close the valve
`WAIT`	5	ON	OFF	Do nothing
`PING`	6	---	---	Send `"I AM ALIVE!"` to the base station over the radio

The state machine is written such that the user can go to the STOP state from any of the other states at any time. This is a safety feature, so that the engine test can be aborted and stopped at any time.

State Transitions

The igniter starts in the CLOSE state. It waits to receive serial input.

The following are two typical state flows:

Complete Run

Power on -> CLOSE
User presses ping button at base station -> PING
User presses start button at base station -> IGNITE
Automatic transition: IGNITE->OPEN
Valve opens and stays open for 10 seconds
Automatic transition: OPEN->CLOSE
Automatic transition: CLOSE->WAIT

Aborted Run

Power on -> CLOSE
User presses ping button at base station -> PING
User presses start button at base station -> IGNITE
Automatic transition: IGNITE->OPEN
User presses stop button at any time during any state -> STOP
Automatic transition: STOP->CLOSE
Automatic transition: CLOSE->WAIT

Radio information:

An Xbee Pro 900HP radio is used both for the igniter and the base station.

The XBee packet includes a checksum, which ensures that the data received by one XBee is the same as the data sent by the other XBee.

Parameter	Value
Specified Outdoor Range	10 Kbps: up to 9 miles (14 km) ( w/ 2.1 dB dipole antennas)
Tested Range	100m
Range to be used	50m
Transmit Power	Up to 24 dBm (250 mW)
Receiver Sensitivity	-110 dBm @ 10 Kbps

uorocketry/UIgnite