View allAll Photos Tagged servo
This series of images will guide you through modifying an HS-311 servo to give continuous rotation in either direction, with a degree of speed control.
The modification is non-reversible, but these servos are cheap as chips so this shouldn't be a big worry.
Now superglue the tab in place. Use lots of superglue! This is the second non-reversible step. If you accidentally move the tab a bit, you should still be able to fix it. If not, don't panic, you can fix it in software later.
Using tweezers, move the potentiometer tab until the gears completely stop moving. Be as accurate as possible, though you can compensate for it not being dead centre in software later.
Linking Fischertechnic and Lego.
With FT I use the TXT controller, with Lego I use the Maindstorms inventor hub and the Techinc hub. To make them work together I use 2 Lego remote controllers. On each remote control there are 4 servos. This controls 4 buttons, the 3 remaining buttons can be operated manually. The servos are controlled by the TXT controller. The RoboPro program on the PC is used for this purpose. The servos themselves are controlled by my DE0 module but this can also be done with an I2C module on the TXT. All hubs use the Pybricks Python software: v3.2.0b4 Pybricks Beta v2.0.0-beta.9
There are 2 Pybricks programs running simultaneously, each controlling a different type of hub.
It is now easy to send commands from the TXT to both hubs. This can be done simultaneously or separately. The big problem with Lego hubs is that they have almost no inputs. Thus, we lack the nice 8 channel digital inputs that are present with the TXT. Through my DEO module, I even have 120 digital inputs. Via the servo controlled remote I can now at least send multiple commands to the Lego modules. The large PC screen where the program can be displayed is also indispensable.
Now to send commands from the Lego hubs to the TXT are a number of possibilities. I use a lot of hall sensors. Small magnets connected to Lego parts can send commands this way quickly and easily. I can also listen in on multiple serial lines from the hubs. That data can be used by the TXT. Thus, positions of the motors can be displayed, as well as other data from the hub. The TXT can display this data on the PC screen.
Pybricks does not have a hub to hub at this time. Now, however, commands can be sent from one hub to the TXT which then forwards them to the 2nd hub.
Take your snippers and remove the tab. Cut it off as low as possible.
You may need to file off whatever's left.
Take the gear that was nearest the wires. It should have a small plastic tab on it which prevents it from rotating through more than 180 degrees.
Flip over to reveal the servo horn. Yours may have a white circlular horn or similar, but it doesn't matter.
has electric motors powered by Valence Technology phosphate-based lithium-ion batteries. It balances with the help of dual computers running proprietary software, two tilt sensors, and five gyroscopic sensors
A broken servo is an excellent oportunity to try PID with Arduino
The controller is broken, but the motor and the enconder are fine.
Here is the servo system I custom built to control the eyes. Aircraft cable routes to a pivoting frame that moves the eyes up and down. There's a second cable for left/right movement connected to one of the eyes. A small link and control arms join the two eyes together.
Servo module, max 64 channels or 32 channels + 32 output leds as status line.
The servo motors are classified in 20 msec time slot. Each servo will have a time part of 2.5 msec, so 8 slots for a period of 20 msec. Each servo motor will have a max pwm pulse time of 2.5 msec. This results in a total of 64 units. If additional a status led are used, the number is limited to 32 servos+ 32 leds.
The upper picture shows a power plane for 16 servo motors. There are 2 separate power pins for the 5V servos. For now, I provide a 5V 4A power unit / power plane for 16 units.
This multiplexing greatly limits the number of I / O pins on the FPGA output side. Only 16 lines are needed for the 64 servos.
Exciting stuff, isn't it! *snore*
That servo did 10k pushups for that Doggy Diner drawing.
More about polargraphs here:
Again with the sign font series. Credit to the old man for rocking the sketches out.
Because of the angular nature of the sketch I couldnt really stretch it out tall like I would have wanted, but overall the colors came through.
Gearmotors are expensive. But you can turn a servo into a gearmotor and servos are cheap.
todbot.com/blog/2009/04/11/tiny-servos-as-continuous-rota...
Had to take out this toyed out e2e with some chromies in the background.. Didn't quite come off like I hoped, but fairly happy with the piece.
The polargraph working the Doggy Diner vector drawing. The drawing took 20.5 hours to complete.
More about polargraphs here:
Notes : Green Real Estate
Format: Colour negative film scan
Licensing: Attribution, share alike, creative commons.
Repository: Blue Mountains City Library - library.bmcc.nsw.gov.au/
Part of: Local Studies Collection - BMCC signage survey
Provenance: BMCC
Date Range: 1983