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Project Description

This program live streams the frames of Basler acA2040-120um camera with additional options such as configuring the camera settings, exporting frames as a video, saving metadata of each frame, triggering camera from SW (pypylon) or HW (Arduino), making inference from a pretrained ML model, preview of the camera stream and model predictions.

The program utilizes threading capabilities of Python to run tasks concurrently without blocking each other.

Installation

Software

  1. Download and install Basler Pylon SDK.
  2. [Optional for hardware trigger with Arduino] Upload utils/arduino_pwm_led/arduino_pwm_led.ino file to the Arduino.

Hardware

  1. Connect Basler USB 3.0 to the computer.

Optional Steps for hardware trigger:

  1. Connect Pin 3 of Arduino with Pin 1 (Brown cable) of the Basler, and GND pin of Arduino with Pin 6 (White cable) of the Basler.

  2. Connect Pin 10 of Arduino with the stimulation's input ((+) for the external LED) line, and GND pin of Arduino with LED's (-) line.

  3. Connect Arduino to the computer via USB.

Set Arduino access rights

# navigate to rules.d directory
cd /etc/udev/rules.d
#create a new rule file
sudo touch my-newrule.rules
# open the file
sudo vim my-newrule.rules
# add the following
KERNEL=="ttyACM0", MODE="0666"

Restart the computer for the access rights to take effect.

Requirements

You can create a new environment before installing the necessary dependencies.

pip install -r requirements.txt

Configs

Acquisition Mode

--acquisition_mode controls the acquisition mode, and is only implemented for "frames" for now.

SW vs. HW Trigger

The cameras can be trigger via both SW or HW (Arduino). The relevant --config file should be provided for either case. For the HW trigger, --trigger_with_arduino should be set to one of the followings ['true', '1', 't', 'y', 'yes']

--n_total_frames should be equal to the product of total duration of each blocks in stimulation_config.json and the AcquisitionFrameRate parameter in the camera config file.

Stimulation

Stimulation should always be used in the HW trigger mode.

If --stimulation_path is "", no stimulation will be triggered.

stimulation_config.json contains the stimulation profiles with the following structure:

"<block number>": {"duration_sec": "8", // duration of the block in sec
                    "stimulation": "1", // bool flag for whether stimulation exists
                    "stimulation_turnOn_times_sec": ["2", "4"], // list of local (within block) stimulation start times in sec
                    "stimulation_durations_ms": ["1000", "2000"], // list of stimulation durations in ms
                    "pulse_ontime_ms": ["50", "250"], // list of pulse on times in ms
                    "pulse_offtime_ms": ["50", "250"]}, // list of pulse off times in ms

Running

You can run the main program acquire_frames_stimulation.py with the default arguments given in .vscode/launch.json

Preview

You can toggle the prediction preview by pressing the "P" button on the keyboard during runtime.

Hardware Troubleshoot

For GPIO coax cable color codes, refer here.

Find Basler GPIO pins here

Arduino

If the Arduino IDE stalls with the following notification:

Downloading index library_index.tar.bz2

End arduino processes in the system monitor or kill their pids, and delete /home/<username>/.arduinoIDE/arduino-cli.yaml file.