Old DVD stepper motor reanimated (60rpm)
https://makertube.net/videos/watch/92fb1fcf-a2a8-4042-baa7-c64a43708826
Old DVD stepper motor reanimated (x2)
Old DVD stepper motor reanimated (100rpm)
https://makertube.net/videos/watch/c8a35c99-0076-4fd8-8e1c-77aafcd40c75
Come controllare un motore DC tramite ESP32 e Bluetooth con L298N su PlatformIO
#bluetooth, #breadboard, #caviDupont, #digitale, #elettronicadigitale, #esp32, #internetdellecose, #iot, #L298N, #libreria, #linux, #motoreDC, #motoreelettrico, #NodeMCU, #platformio, #ponteH, #PWM, #tutorial
How to control a DC motor via ESP32 and Bluetooth with L298N on PlatformIO
https://www.techrm.com/how-to-control-a-dc-motor-via-esp32-and-bluetooth-with-l298n-on-platformio/
#bluetooth, #breadboard, #DCmotor, #digital, #digitalelectronics, #Dupontcables, #esp32, #Hbridge, #internetofthings, #iot, #L298N, #library, #linux, #NodeMCU, #platformio, #PWM, #tutorial
Steppers and ESP32 Make This Retro-Modern Flip-Clock Tick
Before LEDs became cheap enough to be ubiquitous, flip-card displays were about the only way to get a digital clock. These entirely electromechanical devices had their own charm, and they have a certain retro cachet these days. Apart from yard sales and thrift stores, though, they're a bit hard to source -- unless you roll your own, of course.
Granted, [David Huang]'s ESP32-based flip clock is worlds apart from the flip cards of the "I Got You, Babe" era. Unfortunately, the video below is all we have to go on to get the story behind this clock, but it's pretty self-explanatory. [David] started the build by making the flip cards themselves, a process that takes some topological tricks as well as a laser cutter. 3D-printed spools are loaded with the cards, which are then attached to frames that hold a stepper motor and a Hall-effect sensor. The ESP32 drives the steppers via L298N H-bridge drivers, but it's hard to say if there's an RTC chip or if the microcontroller is just getting time via an NTP server.
[David] might not be the only one trying to recapture that retro look, but we've got to hand it to him -- it's a great look, and it takes a clever maker to not only build a clock like this, but to make a video that explains it all so clearly without a single word of narration.
[Bin Sun] sent us this tip. Thanks!
#clockhacks #analog #clock #digital #esp32 #flipclock #flipcard #hbridge #l298n #stepper
Raspberry Pi Zero Takes the Wheel in Miniature Fighting Robot
Looking to capitalize on his familiarity with the Raspberry Pi, [Sebastian Zen Tatum] decided to put the diminutive Pi Zero at the heart of his "antweight" fighting robot, $hmoney. While it sounds like there were a few bumps in the road early on, the tuxedoed bot took home awards from the recent Houston Mayhem 2021 competition, proving the year of Linux on the battle bot is truly upon us.
Compared to using traditional hobby-grade RC hardware, [Sebastian] says using the Pi represented a considerable cost savings. With Python and evdev, he was able to take input from a commercial Bluetooth game controller and translate it into commands for the GPIO-connected motor controllers. For younger competitors especially, this more familiar interface can be seen as an advantage over the classic RC transmitter.
A L298N board handles the two N20 gear motors that provide locomotion, while a Tarot TL300G ESC is responsible for spinning up the brushless motor attached to the "bow tie" spinner in the front. Add in a Turnigy 500mAh 3S battery pack, and you've got a compact and straightforward electronics package to nestle into the robot's 3D printed chassis.
In a Reddit thread about $hmoney, [Sebastian] goes over some of the lessons his team has learned from competing with their one pound Linux bot. An overly ambitious armor design cost them big at an event in Oklahoma, but a tweaked chassis ended up making them much more competitive.
There was also a disappointing loss that the team believes was due to somebody in the audience attempting to pair their phone with the bot's Pi Zero during the heat of battle, knocking out controls and leaving them dead in the water. Hopefully some improved software can patch that vulnerability before their next bout, especially since everyone that reads Hackaday now knows about it…
While battles between these small-scale bots might not have the same fire and fury of the televised matches, they're an excellent way to get the next generation of hackers and engineers excited about building their own hardware. We wish [Sebastian] and $hmoney the best of luck, and look forward to hearing more of their war stories in the future.
#raspberrypi #robotshacks #battlebot #battlebots #bluetooth #combatrobot #l298n #pizero #python
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