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The plan is to build a clock with a 20M2 I have laying around. I searched around a bit, but I keep coming back to this thread: http://www.picaxeforum.co.uk/showthread.php?7142-Very-Accurate-18X-Timing I'm a bit puzzled. How do I use this with the 20M2, and will I still be able to use the...

I want to read/write(but mainly read) from the serial console of my Raspi and Kindle, which run at 3.3v and 1.8v respectively. What is the simplest way to do this with the 5v USB serial cable that I have for my PICAXE? I think that for writing, I can use a voltage divider of 2 resistors. What...

I have an application where I'm using pulsin and run the 20X2 in I²C slave mode as well. The idea is that the I²C master reads out the pulse length, but accuracy is bad when the read happens during the pulse. What I'd like to do is, only doing a pulsin after a read. So, say there is a read...

I'm currently using the internal pullups on my I2C lines, but the guide just says they are "weak pullup resistors", are they suitable for this job? I can successfully communicate with the PICAXE(slave mode), but I notice that if I read values from it in a tight loop, I get bogus values. Could...

I found out how to make my own moisture sensor, but it needs to run on AC, to avoid electrolysis. I also figured out I need a precision rectifier to be able to measure the resistance over the moisture sensor. The problem is that I'm a little confused how the ground works with respect to the AC...

I started soldering my servo board, piece by piece. What I have now is just the serial connection(works), the I2C connection and power(works) and finally a PWM input with 10K pulldown. Pulsin prints values ranging from 100 to 230 most of the time, which is about the expected range for a servo...

I have read in several places that it is recommended to put a 330 Ohm resistor on, for example, a led or servo, attached to the PICAXE. I am trying to understand some basic electric principles here. I read a bit about Ohms law, and from what I understand, I need to know the resistance of the...

How do you connect them? Just glue and wire, or is there something more sophisticated you can do? I want to solder an RJ11-style socket to a stripboard, but it has the pins in two small alternating rows.

For my servo control project, I need to switch between manual control(RC receiver) and autopilot(PICAXE), but it seems reading 4 PWM servo inputs into the PICAXE is not a good idea. So therefore I got a 4053, so that I can read one input into the PICAXE, and let it switch 3 outputs between...

It seems that to do anything serious with the PICAXE, one needs a oscilloscope. Maybe a nice addition to the starter pack? I looked around, and at first I found only bulky boxes of €200 and more, or very old and broken versions of the same concept for €50 or more, but then I found a USB one for...

Now that my servo controller project is making some progress, I started to think about how to lay out the schematic I have in mind on the stripboard I bought. It's not entirely trivial to make sure all the correct lanes are connected, and only those. That is why I started writing a piece of...

Hi, I'm a programmer who's almost completely new to building my own circuits. The plan: Build a servo controller that can be controlled via I2C, with backup from a receiver. I found an existing circuit for the first part, and it doesn't seem to complicated to add a few servo inputs as well...