ChrisPomeroy
Newbie level 1
ALL I'm asking for is suggestions on HARDWARE that will be needed to build this. I'm thinking microcontroller, UART, Some sort of communication chip, etc. ANY and ALL suggestions would be greatly appreciated. Each device being monitored generates a 32-bit word to be stored.
AGAIN, I'm just looking for hardware suggestions...i.e. what is needed to make this happen.
NEED: to create a data capture device that couldperform a data capture function with no human assistance, and provide a signal when it has completed its task.
Specific requirements are:
- not much bigger than a standard paperback novel (or two)
- power draw of less than 10 watts; may require a self-contained power supply
- capable of reading one ARINC 429 bus
- sufficient RAM and NVM to hold approx 1800 ARINC 429 labels per bus
- would have a programmable trigger condition
- capability of selecting 4 labels on each bus to be monitored
- trigger condition and data items to be monitored would be loaded into the unit via personal computer
- capability of defining the position of the trigger position relative to the captured data (eg, all data before trigger, all data after, or trigger in the center of the data)
- would capture data when the condition triggered, and light an LED to announce that fact
- capable of writing out the captured data to a laptop
- would have a flange-mount case that could be adapted to a variety of mounting configurations
- would use a connector common to the aircraft industry
- equipped with an on/off switch
Example trigger condition:
Weight on wheels transitions from True to False AND APR Arm is True AND (Left Cowl Unlocked is True OR Right Cowl Unlocked is True) AND
DC Essential Bus Voltage is greater than 18.0 VDC
Note that each of these signals could be on different ARINC labels, possibly on different busses. Some signals are Booleans, some are twos complement BNR.
SOME THOUGHTS I'VE HAD...
“sniffs” (i.e. monitor only/no transmit) an aviantion standard serial data bus
Commercial or proprietary UARTS could probably be made available for communicating with the bus protocol
Continuously copies all traffic to a non-volitile BHFB (Big Honkin’ FIFO Buffer).
Freezes operations (including buffer state) and sets an external flag (LED?) upon trigger condition.
Trigger condition programmable through external device (probably PC based utility, via an RS-232 or USB hookup. Trigger defines combinational logic based on data sniffed from the bus, and trigger can be defined to freeze the FIFO at any point along the FIFO timeline.)
Self-contained, long-term power supply with power conservation feature (i.e. minimal drain when no bus traffic—may be OK if initial traffic not captured while waking up.)
may need to have a real-time clock / date & time stamp feature at trigger.
The idea is to just log the data to the FIFO once the trigger logic has been evacuated as true.
Thanks in advance
AGAIN, I'm just looking for hardware suggestions...i.e. what is needed to make this happen.
NEED: to create a data capture device that couldperform a data capture function with no human assistance, and provide a signal when it has completed its task.
Specific requirements are:
- not much bigger than a standard paperback novel (or two)
- power draw of less than 10 watts; may require a self-contained power supply
- capable of reading one ARINC 429 bus
- sufficient RAM and NVM to hold approx 1800 ARINC 429 labels per bus
- would have a programmable trigger condition
- capability of selecting 4 labels on each bus to be monitored
- trigger condition and data items to be monitored would be loaded into the unit via personal computer
- capability of defining the position of the trigger position relative to the captured data (eg, all data before trigger, all data after, or trigger in the center of the data)
- would capture data when the condition triggered, and light an LED to announce that fact
- capable of writing out the captured data to a laptop
- would have a flange-mount case that could be adapted to a variety of mounting configurations
- would use a connector common to the aircraft industry
- equipped with an on/off switch
Example trigger condition:
Weight on wheels transitions from True to False AND APR Arm is True AND (Left Cowl Unlocked is True OR Right Cowl Unlocked is True) AND
DC Essential Bus Voltage is greater than 18.0 VDC
Note that each of these signals could be on different ARINC labels, possibly on different busses. Some signals are Booleans, some are twos complement BNR.
SOME THOUGHTS I'VE HAD...
“sniffs” (i.e. monitor only/no transmit) an aviantion standard serial data bus
Commercial or proprietary UARTS could probably be made available for communicating with the bus protocol
Continuously copies all traffic to a non-volitile BHFB (Big Honkin’ FIFO Buffer).
Freezes operations (including buffer state) and sets an external flag (LED?) upon trigger condition.
Trigger condition programmable through external device (probably PC based utility, via an RS-232 or USB hookup. Trigger defines combinational logic based on data sniffed from the bus, and trigger can be defined to freeze the FIFO at any point along the FIFO timeline.)
Self-contained, long-term power supply with power conservation feature (i.e. minimal drain when no bus traffic—may be OK if initial traffic not captured while waking up.)
may need to have a real-time clock / date & time stamp feature at trigger.
The idea is to just log the data to the FIFO once the trigger logic has been evacuated as true.
Thanks in advance
