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Step 3Preparing the Logic Analyzer
So now, you know how the transmission physically works, and what the demodulator will output. It outputs logic HIGH (5v) when no signal is detected, and logic LOW (0v) when a modulated signal is detected. All right, enough theory. How are we going to record and use this signal ? We need a logic analyzer. Unfortunately, these types of tools don't come cheap (~150$ for the Logic ), but the Arduino community really has a lot to give, and someone named gillham made an Arduino sketch that transforms the Arduino into a SUMP-compatible 1MHz logic analyzer. Yeah, 1MHz isn't brilliant, but hey, it's free, and it will suffice for our light use.
- You have normally already downloaded the modified SUMP client in Step 1. If not, here it is.
- You'll also need the logic_analyzer.pde Arduino sketch
- Connect the IR demodulator's data pin (the one on the left) to the Arduino's pin 8.
- Connect the demodulator's GND (middle pin) to the Arduino's GND
- Connect the demodulator's Vcc (Right pin) to the Arduino's 5v supply.
- Extract the OLS zip, connect your arduino via usb, and execute the run.bat (if you're under windows) or run.sh (if you're on linux).
- Now hit the 'Begin capture' button, select the serial port your arduino is using, choose 115200bps speed
- In the 'device type', choose the "Arduino Generic Logic Analyzer" profile.
- In the 'Acquisition' tab, choose 20kHz sampling rate, check the 'automatic recording size' checkbox.
- In the 'Triggers' tab, enable the triggers, and in all the checkboxes on the bottom, check the top-right one.
- Now click the 'Capture' button and raise the throttle on the heli's remote.
- If you have any problems, post a comment, I'll help you. ;)
Note: You can get a sort of 'manual' on the OLS here , and also, I apologize for the poor image quality, but this is caused because Instructables.com compresses uploaded images. :(
Ok, so everything is ready, let's dive in ! Step 4: Capturing IR pulses...
- You have normally already downloaded the modified SUMP client in Step 1. If not, here it is.
- You'll also need the logic_analyzer.pde Arduino sketch
- Connect the IR demodulator's data pin (the one on the left) to the Arduino's pin 8.
- Connect the demodulator's GND (middle pin) to the Arduino's GND
- Connect the demodulator's Vcc (Right pin) to the Arduino's 5v supply.
- Extract the OLS zip, connect your arduino via usb, and execute the run.bat (if you're under windows) or run.sh (if you're on linux).
- Now hit the 'Begin capture' button, select the serial port your arduino is using, choose 115200bps speed
- In the 'device type', choose the "Arduino Generic Logic Analyzer" profile.
- In the 'Acquisition' tab, choose 20kHz sampling rate, check the 'automatic recording size' checkbox.
- In the 'Triggers' tab, enable the triggers, and in all the checkboxes on the bottom, check the top-right one.
- Now click the 'Capture' button and raise the throttle on the heli's remote.
- If you have any problems, post a comment, I'll help you. ;)
Note: You can get a sort of 'manual' on the OLS here , and also, I apologize for the poor image quality, but this is caused because Instructables.com compresses uploaded images. :(
Ok, so everything is ready, let's dive in ! Step 4: Capturing IR pulses...
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At this very step after i started the capture with OLS which is always aborted with the following error.
"Capture aborted! Duplicate key: 0x30!"
And i do not know how to go from here at all :(
I am using a Arduino Deumilanove and the latest arduino IDE v1, and i get the same error rather i am on Windows or Ubuntu. Any thoughts on why this is happening?
Downloaded at https://github.com/gillham/logic_analyzer
Works fine now. Hope this helps others :-)