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I'm currently updating my old Picaxe based environmental data logger, that up until now has only measured temperature, relative humidity and carbon dioxide concentration. There are now some affordable particulate sensors that can measure the three main particulate sizes of concern as fair as...

I can't see anything in the manual or the online help about slowing the clock further (say, setfreq M2) and whether this then allows 300 baud as the minimum, rather than 600 baud with a 4MHz clock which is as slow as I can go according to the manual. I'm not in a position to do a quick and...

On another thread I took things off topic by looking at ways to measure water level in a borehole well. This thread is to hold those posts moved by admin (I hope) so please don't add posts here until the old posts have been moved over. The challenge I have is wanting to measure the depth of...

I can foresee an unintended, probably massively under-reported, issue arising here. I don't think I'm alone in having grave reservations about the way that Microsoft have switched their business model. All companies need a revenue stream, but Microsoft (and others) have realised that the...

Whilst looking for something unrelated, I came across these cheap serial addressable relay modules: http://www.banggood.com/One-Channel-Relay-Module-Intelligent-Custom-Command-Control-Serial-Control-Multi-Mode-Level-Trigger-p-1077655.html From what I have been able to decode from the...

Is anyone else getting spam PMs? It started with me getting spammed by some Chinese sales person who I traced back to Futurlec, then a couple of other nondescript Chinese spammers that I just deleted, today it's a PM from "Lily-Han Disen" supposedly from Shenzhen Han Disen Technology Co.,Ltd...

Some may recall this thread: http://www.picaxeforum.co.uk/showthread.php?28761-Alternative-to-ERF where I started off looking for a replacement for the now-discontinued ERF transceiver modules and the conversation drifted into a discussion about the cheap Chinese HC-11 and HC-12 modules that...

HC-11 433MHz transceiver (was: Alternative to ERF?) [I've edited the title to reflect the drift in this thread in later posts to include details of the HC-11 transceiver modules] I've just heard that the ERF has been discontinued, which is a nuisance, as I've been using them and now have no...

Ebay seems infested with these cheap interface boards that use a STC15L204EA microcontroller (A 51 series, I believe) to do all the heavy lifting when driving the cheap and effective NRF24L01 transceivers, like this ad...

With the clocks shifting back recently, I was reminded of what a pain it is going around setting the time on several time switches we have around the house. Years ago I thought of automating this (no one seems to make an affordable radio time code time switch) but have never got around to it...

A quick question that I can't find an answer to. I'm trying to measure the time between serin events. I have an RF data link that transmits a handful of characters every ~ 30 seconds or so. I have a simple bit of code that has a serin, then a simple calc that uses the time variable to...

I've been using DS18B20 sensors in lots of projects for a couple of years now, with no problems at all. Suddenly I find myself puzzling over an odd problem that I can't quite understand. I'm currently working on a heating/cooling control system and wish to modify it slightly to use an extra...

I've had a search, but can't see any mention of this, so thought I'd ask. The majority of digital electricity meters (and some gas meters, I believe) now have an IrDA port from which the meter can be read. The great thing about this is that I understand that quite a bit of data can be...

First off, a safety warning. This is NOT a project to be attempted by anyone who doesn't understand the risks of working with mains voltages. If you aren't competent at building a circuit that includes mains voltage wiring DO NOT attempt to build this. OK, now I've (hopefully) allayed the...

As mentioned in a thread on the active forum, I've been working on building an air quality monitor that measures and records CO2 concentration, temperature and humidity. The idea is to use it to monitor home ventilation system effectiveness. The hard part was finding a suitable (and...

I've spent the last few hours trying to bottom out an odd problem. I have an OpenLog connected to a 20M2, so that C.3 transmits serial data at 9600 baud to the OpenLog and C.4 receives serial data from the OpenLog. The received data is in ASCII and consists of five ASCII characters read from a...

I recently bought a couple of these sensors, mounted on interface boards with 3.3V regulators, level shifters and 4k7 pull-ups. I assumed they'd be fairly easy to hook up to a Picaxe, but it seems that it isn't as easy as I'd thought. The datasheet isn't great (it's sort of written in...

On this thread: http://www.picaxeforum.co.uk/showthread.php?23360-Humidity-Module-Issues the conversation drifted off into a discussion on calibration. When I first built my humidity sensor modules (using a Humirel HS1101, as detailed here...

There's an interesting application of a Picaxe on the BBC News site, using it to animate a dead sparrow: http://www.bbc.co.uk/news/technology-21579211 Not as macabre as it sounds when you read why they were doing it.

In another thread discussing timing accuracy, hippy suggested starting a new thread on pulse width measurement accuracy: which followed on from this observation I'd made: I'm currently pushing the limits a bit by trying to sequentially measure the width of 32 low pulses with just a 275µS...