Jason writes:This entry shows the configuration I used to make a NMB (Minebea Electronics Co.) PM35L-048, 24VDC, 9.4 Ohm unipolar stepper motor work. I salvaged several of these motors from some Xerox inkjet printers. The motors were labeled well and I found manufacture specifications on-line. I was not able to find a wire diagram so I defaulted to making a truth table as I had done for unipolar steppermotors. Most steppers with 4 wires can usually be identified as bipolar stepper motors, which can be driven with a dual H-bridge IC such as the SN754410 by Texas Instruments.
Driving a Bipolar Stepper Motor: [Link] - [Via]
Its always great to read a tutorial that can help you get started on something, because it can provide a solid base from which you can progress. For example this getting started tutorial on PICAXE microcontroller, will teach you all you need to know for putting together a beginners project. From software to hardware its all covered.
Getting Started with PICAXE Microcontrollers: [Link] - [Via]
John Ryan on the Arduino forums says:
Here’s 2 ATMega168’s sharing one 16mHz resonator, one reset switch, two 10k resistors, one 220ohm resistor, and two LED pilots. I used a mini USB adapter and uploaded the LED blink test to both chips, and as Paul [Badger] suspected, they are perfectly synchronized - I’ve tested numerous resets, and the start up blink sequence and blink demo on both, are identical.
I don’t need synchronized chips, but I happen to have a use for 2 168’s connected via i2C - not sure if anyone else does but it adds a lot of pins and a second serial buffer for an almost next to nothing outlay. This can be put together using 1 RBBB and a second chip with the boot loader installed, so that’s quite inexpensive, so long as you’ve got got a mini USB adapter laying around.
Dual Core Arduino: [Link] - [Via]
This is a Binary Counter based on 555 timer and 4520 CMOS integrated circuit.The circuit looks simple and easy to build ,but with a simple modification you can turn your circuit into device that works like high tech dice.Rather then throwing dice to create a number you can use your 4520 to create random numbers between 0 and 15.
IC 4520 Binary Counter: [Via] - [Link]
This short tutorial will show you how to setup a breadboard with an Atmel AVR microcontroller to be programmed using In System Programming (ISP). This allows you to program and re-program your chip whilst in your own circuit, without the need to be constantly removing it and placing it in a dedicated programmer.
You will need an ISP compatible programmer. These typically plug into the parallel port of your computer and have a 10 Pin IDC connector like the one shown below.
AVR In circuit programming or ISP: [Link]
