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Came across this in another forum. It might be useful to help some folks calculate current limit resistors values when driving various LED types with a user-defined power source: http://hackaday.com/2013/01/14/papercraft-dial-is-the-slide-ruler-of-current-limiting-resistors/ Richard

For those who are input pin constrained (i.e. 08M), here is another simple and clever way to read multiple switches and a potentiometer on a single ADC pin. The April 22, 2010 issue of EDN Magazine (page 71) or HERE (if you don't have the magazine) shows how to do it. I have used something...

Greetings All, I am designing a new board and wish to use a single USB cable to both program and power the PICAXE (I understand it is "non-standard"). Basically, I want to use a USB "A" connector at the PC end and a USB "B" connector at the PICAXE (or board) end. I am hoping to avoid building...

My head hurts! As I await delivery of some 08Ms, I have been reading up on various forum posts and Googling like someone possessed. For my next 08M project, I thought it might be fun to incorporate a few of the many "new" approaches, contributed by all you very creative folks. Hopefully, some...

The December 5, 2008 issue of EDN (page 51) or located here describes another, inexpensive approach for Maximum-Power-Point-Tracking, useful for small-scale solar arrays. Richard

The November 27, 2008 issue of EDN (page 59) or located here describes the latest of the "plexing" approaches to driving multiple LEDs with few uC ports. Chipiplexing (derived from the author's nickname) has some advantages over Charlieplexing, including driving N-1 LEDs simultaneously, using...

A number of approaches have been suggested in the past to input parallel data into a PICAXE (i.e. 08M) with limited I/O pins. Here is another one that recently appeared in the 10/02/08 issue of EDN Magazine (page 60) using a 74HC165 that might be useful. The article is also available online...

Recently, I had an enormously satisfying personal experience exposing for the first time some Special Ed. middle and high school students to the PICAXE during summer school. I had expected my ongoing and untested boasts about being able to teach anyone to write their first PICAXE program...

As I continue to get my arms around my solar / wind hydroponics project, use of charge / dump controllers to manage my 12 Vdc battery becomes the next order of business. Continuing my Internet education yielded a very simple dump controller circuit at Hurd Solar - redrawn below for...

As I PATIENTLY wait for the Linux-based PE, my usual daily Internet diversion recently led me to research alternate energy sources again. No, I haven't bought into the WORLD-WIDE "global warming" HOAX, but rather have an interest and curiosity about other forms of energy. A year or so ago, I...

As I continue to mess with RGB LEDs, I have written a working, proof-of-concept program on an 08M to generate three, independent synchronous PWM outputs. Although the frequency won't be high enough (LED flicker) on an 08M for my application, it does allow me to test this algorithm. Currently...

Single-Step Simulator Anomaly w/Lookup Using Program Editor v5.0.7 (enhanced compiler) in single-step simulator mode with 08M: I've been playing with the lookup function as a variable "zero detect" in the following format: do lookup REDcounter, (red), var gosub update lookup...

Now that the OLPC project is about to start shipping with its Linux-based Sugar OS and the same for the Linux-based Asus Eee PC 701, any update/thoughts on a possible Program Editor to Linux port? Go ahead, make my day! Richard

A previous, forgotten and unfinished project surfaced recently which I plan to finally complete: <A...

After daydreaming about some projects for the last month and not being able to think &quot;outside the box&quot;, I thought I would ask for some brainstorming help. I've read some previous posts (on RGB LEDs and multiplexed displays) and I'm still confused. A quick scan of the MAX696x...

Greetings All, As my snout emerges from the closet, I find myself interested in playing with POV using an 8x8 RGB LED matrix controlled with a Picaxe. Has anyone used these LED matrix devices with any success? I am tempted to buy an SPI-driven, AVR-controlled unit available from Spark Fun...

I'm working on a Picaxe-controlled (08M) 6Vdc submersible pump system which currently works. Basically, the 08M wakes periodically, turns on the pump for a few minutes, then turns the pump off and goes back to sleep, to awaken again later and repeat the cycle. Does anyone have some suggestions...

I am playing with an 08M and wondered about performing a POST of the controller and associated components. Since my Picaxe is &quot;sleeping&quot; most of the time, I thought it might be cool upon power-up to check various functions (microcontroller, clock chip, etc), turn on an LED if tests...

Hi All, As a newbie 08M user (still playing with flashing LEDs) and first-time poster, please excuse me if I have posted incorrectly. I am interested in using a switch-driven interrupt to jump to various routines within my program and use the switch (press time) for multiple functions. This...