This schematic shows the TI AMC1200 in a motor control application. The motor phase current is measured at the resistor (RSHUNT), and the signal is processed through an RC filter before reaching the AMC1200. Also shown are optional protection capacitors C3 and C4. The TI AMC1200 get its high side power from the power supply of the upper gate driver, and a 5.1V zener diode regulates the voltage. The high transient immunity of the AMC1200 and AMC1200B ensures reliable and accurate operation even in high-noise environments such as the power stages of the motor drives.
Motor Control using TI AMC1200 - [Link]
Davide Gironi writes:
The PWM frequency have to be selected in the way that the switch frequency is much higher than the dynamics of the motor.
To avoid noise from the motor, the choosen PWM frequency is 20Khz. Which is a know to know frequency.
So, with this one, you can drive up to 4 motors independently controlling:
*slow start / stop
Setup parameters are contained in dcmotorpwm.h
This library was developed on Eclipse, built with avr-gcc on Atmega8 @ 8MHz.
Driving a DC motor using PWM with AVR ATmega - [Link]
Drilling holes in homemade PCBs is greatly simplified with an computer-driven coordinate table on a drill press.
The clue is the on-the-fly calibration technique, so it does not matter where exactly the PCB lies on the table. You only need to move to two drill holes by hand, then the computer knows how to drive to the other holes.
(semi) Automated drill press table for PCB manufacture - [Link]
What a CAM Drive can or can not do:
A CAMdrive node must be selected according to the motor.
Stepper motors need a Stepper Controller of CAMDrive.
Normal DC motors need a CAMdrive-BrushedDCMotor controller.
To connect with Bluetooth, only one node needs the Bluetooth module. The remaining nodes are wired via the bus.
There is only one power supply required! No matter which node is connected, it supplies the remaining nodes and motors on the bus
It does not matter on which node the camera is connected, it all work “Camera” jacks simultaneously.
The bus connection is established via a standard network cable (patch cord).
CamDrive – an open source multi-axis control for time-lapse photography - [Link]
by w2aew @ youtube.com:
This video shows a simple circuit that can be used to control the position of an typical remote control (RC) style servo with an analog voltage. The PWM (pulse width modulated) control signal format for an RC servo is reviewed, followed by the presentation of a simple circuit that can be used to control the servo with a simple adjustable DC voltage. The circuit is built with rail-to-rail op amps and a few resistors and capacitors. Note that the schematic presented doesn’t include all of the decoupling on the power supply and reference lines that you would likely want to include. A description of the circuit, as well as a more in depth discussion of each of the building blocks such as an integrator, hysteresis comparator and DC signal conditioner circuit including an attenuator, inverting amplifier and level shifter, is presented.
Circuit Fun: Control an RC Servo with an adjustable DC voltage - [Link]
by Michael Whybray:
Most desk fans I have come across have three speeds: Full Speed, Almost Full Speed, and Off – useless if you want just a gentle air movement, and far too noisy if you are trying to get to sleep (in your bedroom of course, not at your work desk!). The squirrel cage induction motors they use have switches to two or more windings – and possibly a capacitor – to reduce the drive current. But unless the drive frequency is also reduced, the torque and speed stability are poor, so minimal speed reduction is usually available on these fans. Using a triac to provide phase control of the voltage works poorly for the same reason, with the speed very sensitive to the triac firing phase angle and fan load, and has a tendency to stall.
Sleep easy with this desk fan speed reducer - [Link]
Ioannis Kedros @ embeddedday.com:
Why this long intro? Well, I am an engineer, a maker in general, that wants to build stuffs. And the swags above came in a nice cardboard tube. A very strong, thick, with a nice light plastic type coating (helping with the moisture during shipping).
This makes a good indoor enclosure, but with proper treatment will be a nice fit for an outdoor enclosure as well. I am going to put a Raspberry Pi inside it together with a camera and some sensors for reading environmental variables.
The RPi is the Model B and has some connectors around it that I am not going to use. Those are taking space and placing the Pi slightly offset of what I want. I decided to remove them and use some of those in future projects. Nothing is going to the trash bin! Anyway, I am not going to use this Pi to somewhere else. The project will be placed permanently in my “lab” and I will do only software improvements.
Project Tube - [Link]
First ever affordable 5axis multi-fabricator that brings most advanced fabrication right to your desk:
We’ve designed machine that combines multi- fabrication methods: 5axis milling being one of them. 5AXISMAKER is a machine versatile enough to fabricate most advanced design prototypes in readily available material while on your desktop right next to you.
Being an alumni of Architectural Association we’ve had an access to most advanced fabrication tools in the world. Yet there is no desktop prototyping machine that has versatility to replicate this technology.
Our company has been initially found as design and fabrication practise, and after years of working with wide range of designers from different fields it has become clear that one should have an instant access to a pallet of prototyping tools. We wanted same machine to include a set of tools like CNC mill, touch-probe, 3d printer, wire-cutter and have a potential for further add-ons.
5AXISMAKER: First ever affordable 5axis multi-fabricator - [Link]
by JColvin91 @ instructables.com:
Whether we care to admit it or not, motors can be found all over in our everyday lives; they just tend to be hidden. Motors are present in cars, printers, computers, washing machines, electric razors, and much more.
However, there are a number of people (which until recently included myself) that would be uncertain of how to make a motor run if they were handed one. So, let’s learn something today. Let’s learn how to use a stepper motor!
How to use a Stepper Motor - [Link]
An instructables on motor controllers for cheap robots by JayWeeks
Almost every robot needs to power a motor of some sort or another. Problem is that motors take quite a lot of power, compared to what most microcontrollers operate with. To solve this problem, robots use what is called a motor controller, which usually amounts to some form of electronic switch that can turn on a very high voltage, using a very low one. That’s what we’ll be making today!
Motor controllers for cheap robots - [Link]