avrstmd.com

AVR-Based Stepper Motor Driver (STMD)

An AVR-Based Microstepping Bipolar Chopper Stepper Motor Driver (STMD). Open Source - The schematic, parts list, and software are all freely downloadable! Hobbyist-friendly - No surface mount parts means allows this drive to be easily repaired! DMOS driver chips rated at 55V and 3 Amps. Easy parts availability - Electronic parts are all available at Digikey. Just add your own heat sink and mounting hardware. DIP Switch selectable modes of stepping:. Full Step, Both Phases On. Full Step, Wave Drive. Statu...

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AVR-Based Stepper Motor Driver (STMD) | avrstmd.com Reviews

<META> DESCRIPTION

An AVR-Based Microstepping Bipolar Chopper Stepper Motor Driver (STMD). Open Source - The schematic, parts list, and software are all freely downloadable! Hobbyist-friendly - No surface mount parts means allows this drive to be easily repaired! DMOS driver chips rated at 55V and 3 Amps. Easy parts availability - Electronic parts are all available at Digikey. Just add your own heat sink and mounting hardware. DIP Switch selectable modes of stepping:. Full Step, Both Phases On. Full Step, Wave Drive. Statu...

<META> KEYWORDS

1 features

2 half step

3 quarter step

4 sixth step

5 eighth step

6 tenth step

7 twelfth step

8 design and configuration

9 an atmel

10 stepping mode

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features,half step,quarter step,sixth step,eighth step,tenth step,twelfth step,design and configuration,an atmel,stepping mode,steps/revolution,half,quarter,sixth,eighth,tenth,twelfth/sixteenth*,where i,maximum,motor,current,resistance,wiring connections

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AVR-Based Stepper Motor Driver (STMD) | avrstmd.com Reviews

https://avrstmd.com

An AVR-Based Microstepping Bipolar Chopper Stepper Motor Driver (STMD). Open Source - The schematic, parts list, and software are all freely downloadable! Hobbyist-friendly - No surface mount parts means allows this drive to be easily repaired! DMOS driver chips rated at 55V and 3 Amps. Easy parts availability - Electronic parts are all available at Digikey. Just add your own heat sink and mounting hardware. DIP Switch selectable modes of stepping:. Full Step, Both Phases On. Full Step, Wave Drive. Statu...

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avrstmd.com

1

Purchasing Information

http://www.avrstmd.com/purchase.html

Assembled and Tested STMD. Click on thumbnail for larger photo. Lead times may apply as these are built to order. -. Includes PCB, programmed AVR, and other required parts. Does not include heat sink. Allow approx. 45 minutes assembly time. Click on thumbnail for larger photo. STMD Kit minus PCB and AVR. Includes required parts except for the PCB, AVR, and heat sink. Allow approx. 45 minutes assembly time. Click on thumbnail for larger photo. Bare Circuit Board with programmed AVR. Thermal Grease, 1 gram.

2

Parts List

http://www.avrstmd.com/parts_list.html

To build the driver as pictured above, you will need to obtain the following items:. 3 Position Removable Screw Terminal. 6 Position Removable Screw Terminal. 4 Position Removable Screw Terminal. Transient Voltage Suppression Diode. Socket, 6 Pin. Header for Jumpers, 4 Pin. Minimum order quantity is 10. Piece of Jumper Wire. Use a clipped diode lead from D1 or D2. 5 Position DIP Switch. Voltage Regulator, 5V. Will need programmed, or get a pre-programmed one here. Socket, 28 Pin. R1, R12, R14-R16.

3

Oscilloscope Waveforms (AVR-based STMD)

http://www.avrstmd.com/oscope.html

The following waverforms were all captured using this. You will note the waveforms in the photos below never go negative. This is due to the way the the current sensing amplifer built into the LMD18245T driver chip. Works Refer the the datasheet for more details. Full-Stepping with One Phase On, 200 steps/revolution. Full-Size Image, 169 kb. Half-Stepping, 400 steps/revolution. Full-Size Image, 185 kb. Quarter-Stepping, 800 steps/revolution. Full-Size Image, 187 kb. Full-Size Image, 173 kb.

4

Unregulated DC Power Supply

http://www.avrstmd.com/power_supply.html

Use at your own risk! Circuit voltages may be lethal. Never work on the circuit when power is applied. Do not short capacitor terminals. Some circuit components may get warm, so mount them appropriately. Bleed resistor is required. No suitability for user's application expressed or implied. I am using a very basic, homebuilt, unregulated DC power supply. Input is 120 VAC which is rectificed and smoothed to an unregulated 33 VDC. As Built Parts List:. Fuse and holder for the incoming 120VAC.

5

Frequently Asked Questions

http://www.avrstmd.com/faq.html

While some of the following have been embellished for entertainment value, most are real questions that I have received. What does 'STMD' mean? It is an acronym for ST. River I couldn't invent a cool-sounding name if my life depended on it. Can you help me modify the design to run a motor at 5 amps per phase? No Go buy a Geckodrive. Is it possible to parallel the LMD18245T for increased current capacity? No Go buy a Geckodrive. Now my 'alive' LED has stopped flashing and is illuminated all the time!

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Electronic Lead Screw Main Page

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Electronic Lead Screw (ELS). The simple way to automate your machinery. The ELS is a single board computer with 35 keys, a rotary encoder knob and 2x20 LCD display designed as an Open Source GPL project to control the Lead Screw and optionally the Cross Slide of a metal lathe. With the ELS, a machinist using a metal lathe can automatically thread metric or imperial and taper material more easily than with the lathe gear box. Features that make the ELS the right choice for controlling your lathe:. The key...

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The Laser Cutter/Engraver (Part 1) – fadedbits.com

http://fadedbits.com/2010/11/the-laser-cutterengraver-part-1

The Laser Cutter/Engraver (Part 1). I don’t remember now when it was that I first discovered laser cutters, but I do know that since that time I have wanted one. But a decent machine costs big $ $ and it was always well out of reach. (You can get inexpensive machines from overseas if you can accept the compromises in quality and features.) Then I stumbled across www.buildlog.net. 8230; with so many awesome examples of home built machines I couldn’t resist the temptation to give it a shot myself. The lase...

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dennis – fadedbits.com

http://fadedbits.com/author/admin

A while back I caught a Hack a Day. Of Sandy Noble’s polargraph. Here’s a couple of videos of my completed machine at work on it’s first real drawing:. And here are a few pictures of the project and some of the completed works. Updated Flying Optics for the Laser Cutter. I did a sanity check on the gcode by starting with and “air run”. Once everything looked OK it was time to start cutting some metal! Here are a few pictures of the final version of the carriage installed on the laser cutter:. The bottom ...

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AVR-Based Stepper Motor Driver (STMD)

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