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Hi All, I want to invite all UK-based PICAXE'ers (and any others that can get here) to attend a brand new event called 'UVX 2014' this July (2014) with their unmanned projects. Here's the story... In 2011 I ran a successful non-commercial event for multicopters and other unmanned aerial...

Hi Hippy, Many thanks for the tips about exponents - much appreciated. I'll give it a go. I figured out the commands by using a terminal application (RealTerm) to look at the output of the PC application that comes with the kit. It's an application that allows you to control the cube via...

If anyone's interested in building an LED cube that they can control with a PICAXE microcontroller, my daughter and I have just made one from a kit. I'm happy to say that it works fine with PICAXE (we're using HSEROUT at 57600 baud) and we are now having fun writing programs for it. The...

Hi, I'm a bit confused. I wrote the following code to get an Analog Devices ADXL362 triple axis accelerometer working. It uses SPI to communicate with the outside world. The weird thing is that I have to have the SPI mode set differently for send and receive to make it work - as per the code...

Has anyone had any luck controlling Futaba S-Bus servos with a PICAXE device? I've searched this forum and the web without any success. The S-Bus system looks like a much simpler system for us to use in terms of wiring. Details on the protocol here...

I've been reading on the forum about the problems associated with serial comms between two PICAXE chips (e.g. http://www.picaxeforum.co.uk/showthread.php?t=8393&highlight=serin+problems). What is the most reliable way to communicate quickly between two AXE200 units (28X2 modules which are...

Say I want to represent a 10-bit number on the pins of a 28X2. 8 bits is easy of course using something like "LET PINSB=B1" or similar. How can I represent the final 2 bits of my 10-bit number on say A.2 and A.3 without affecting what's going on on the other pins? Is this possible?

I need to keep track of the position of a stepper motor. I intend to do this by monitoring the step and direction lines that are controlling the motor (it's a normal step and direction stepper driver). Critically, I have to display the result on a serial LCD. I have set up a system with an...

Hi, Does anyone know if you can still buy the old-fashioned LED clusters of the type that you used to get in calculators in the 1970s/80s? I was thinking of having a go at recreating the Sinclair Black Watch! :) Nigel

Hi All, Can anyone tell me if there is any documentation on the use of SPI with PICAXE? I have searched around this forum and the Rev Ed documentation with no luck. I have a project starting soon where I have to use it so I need to learn fast! There is a tantalizing reference to some...

Hi, This may be a question for Technical but regarding the standard PICAXE programming connector (the stereo 3.5mm plug) does anyone know why the tip is ground rather than the ring nearest plastic moulding? On nearly everything else I can find that uses a stereo connector, the convention is...

Hi Technical, Hippy suggested I post this here so here goes... The manual says that servo-related commands should create a pulse-width of the value x0.01ms. I have checked this and (at least for the 08M) the commands do not give accurate results. I know that individual chips may vary but after...

Hi All, The inputs on the 28X1 have thresholds of 0.8x the supply voltage. Will this be the same on the 28X2? Cheers, Nigel

In the 'Interfacing Circuits' manual section 3 deals with interfacing to a computer and shows a recommended 5v configuration with resistors on the Rx and Tx lines. How important are these? Is this what I should be doing for all my serial comms to external devices? (I'm only using 5v serial...

In the 'Getting Started' manual there is a diagram showing the pinouts of the 28X1. What is the significance of the 'Ser Rx' and 'Ser Tx' functions on Pins 17 and 18? (My understanding is the you can either use SEROUT to transmit serial data on any of Pins 21 to 28 or use SERTXD to send data...

Hi, I am using the SERVO command with an 08M and would like the pulse width to be correct. I have noticed that as a default, if I use the command... servo 1,150 ...then I get a pulse width of around 1.69 ms instead of 1.5 ms. I figured that I could use SETFREQ to fix this so I tried various...

Hi All, The PICAXE alphanumeric LCD panel is great but I need something smaller for a display on a small radio-controlled helicopter. I have got an I2C display working (thanks to the helpful advice from people on this forum) but I'd like to find something simpler to program if possible. I...

Howdy all, I have been trying to locate a supplier for this type of Hall Effect current sensor... The picture comes from the Hall Effect entry on Wikipedia and I have spent about a day looking around the Internet looking for ones exactly like this without success. It's ideal for my...

I was looking for a really thin, ready-made LCD display for use in a PICAXE 28X1 project that I am working on and I found the Eagle Tree 'PowerPanel LCD Display" (See http://www.rc-log.co.uk/index.php?target=products&product_id=30) It looks great for my purposes because it's only about 5mm at...

If anyone likes a challenge, here's a problem that I'm currently battling with which - at first glance - seemed really simple to me but which actually turned out to be a bit of a brain teaser... The challenge is to write some code for an 08M which will add a variable amount of 'inertia' to the...