Скачать или смотреть DPRG RBNV - Robot Builders Night Virtual - October 7, 2025

Chapters
0:00:00 Start
00:01:00 Paul announced engagement with Amazon tours to set up a tour of the Amazon fulfillment facility in Grapevine, Texas, possibly scheduled for December or the first week of January.
• 00:03:00 DPRG news highlighted the release of the September monthly meeting video and slides, specifically pointing out Karim's impressive robot demonstration (starting at 1 hour 0 seconds).
• 00:05:00 Mike Williamson began his demonstration of the Awesome Truck (RC20) project, showing its navigation mode starting a long-distance search for a cone it couldn't initially see, and utilizing speech-to-text functionality.
• 00:09:00 Mike displayed FoxGlove plots, noting that the camera detected the cone up to eight meters away, while the LIDAR detection range was limited to about two and a half meters.
• 00:12:00 Mike explained his conceptual LIDAR identification method, which uses three validations, including looking for discontinuities and checking if the detected object width matches the cone width at that distance.
00:17:00 Pat Caron presented a technical challenge regarding ROS 2 communication failure—the LIDAR scan topic was unable to transmit across the network from a Docker container on a Raspberry Pi to his host PC.
• 00:30:00 Paul suggested using the ROS 2 diagnostic command "ros2 multicast send/receive", which confirmed that multicast packets were failing to leave the container/Pi and reach the PC.
• 00:35:00 Troubleshooting shifted to checking UDP connectivity (using Netcat/NC) and identifying potential root causes like Access Point isolation settings on routers or firewall configurations.
• 00:38:00 Paul Bouchier raised a "stump the club" question concerning porting Maker's Pet firmware to the linorobot software, where the right motor encoder counts failed to change and exhibited an unusual 4V to 3V square wave modulation.
• 00:54:00 Based on the schematic, the group identified a potential hardware problem: a jumper selection (J2/J3) appeared to be incorrectly sending +5V (Vinc) to the encoder instead of the desired +3.3V.
• 00:56:00 Carl Ott suggested using ChatGPT (GPT) to analyze the Arduino C/C++ code to determine if the microcontroller input pins were inadvertently configured as outputs or had pull-ups enabled.
• 00:58:00 Mark R discussed Maker's Pet improvements, including using a magnetic LIDAR attachment and working on software to allow the robot to search through multiple Wi-Fi stations.
• 01:02:00 The group confirmed that robots on the same network should use unique ROS IDs or unique namespaces to prevent communication interference.
• 01:06:00 Pat Caron detailed his new robot design, planning to use an RP2040 (Pico) running MicroPython for low-level motor control and a Raspberry Pi for high-level ROS 2 processing.
• 01:11:00 Pat planned to use OpenCV to analyze the LIDAR map image to quickly detect circular shapes like goals or cans, optimizing path planning.
• 01:17:00 Tom Crawford showed his non-robot project: a custom musical doorbell system using an ESP8266 and a self-built 8-bit R2R network D/A converter.
• 01:21:00 Discussion covered drone fulfillment at the Amazon Grapevine facility, including details about Amazon's large (80 lb) drones (ed mart provided information on the Amazon drone).