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I have a project where I am using a PICAXE controller to control water heating at solar thermal hot water systems. Things are going well and I am using the controller for monitoring as well - by outputting data every few mins to an Excel spreadsheet. I have several installations and I use...

I started a Thread on 9 Apr 2013 “EMC Testing” before attempting to get my control circuit based on a 20X2 through the UK EMC tests. People gave me helpful time and advice and I’m reporting back here after completion of the testing. This is the same material as in the main Forum thread...

I started a Thread on 9 Apr 2013 “EMC Testing” before attempting to get my control circuit based on a 20X2 through the UK EMC tests. People gave me helpful time and advice and I’m reporting back here after completion of the testing. Before I get going, I’ve tried to see if there has been any...

I posted a few weeks ago about Electromagnetic Compatibility (EMC) testing of my PICAXE based (potential) product. There were several issues highlighted that need addressing. With one at least I think I need help……… It’s the communication between the controller and the OLED display. The lead...

I am developing a solar thermal (hot water) system with a control system using the PICAXE 20X2 chip. I’ve done plenty of user trials and now I’m gearing up to commercialise. To get my CE marking I believe the system needs to pass some EMC tests – so that we know it won’t be upset by other...

Folks I can't see where I'm going wrong with my DS1307 project. The clock reports time very slow - about 40 secs reported for every actual min passed. Here is a sketch of the circuit: And here is the code. It's a 20X2 chip. I used the wizard under 'AXE110 Datalogger' to set the clock then...

I need to decide whether to use REG001 78L05 Fixed Voltage Regulators or the considerably more expensive REG005 5V voltage regulators which the tech-supplies website say are "low dropout voltage regulator (higher quality than 78L05)." I want a fully reliable circuit but don't want to waste...

I've been struggling with getting reliable readings from my DS18B20 sensors when I also have hpwm code. I am running a variable speed pump based on temperature readings. I see from the manuals that the readtemp12 commands can interact with hpwm due to internal frequency changes and the manual...

I've bought about 15 of the budget LCD and OLED kits and I can't make them up consistently. I've had 1 or 2 in the past that just never worked and yesterday I made 2 and neither work. I've checked for shorts between the header pins and my other soldering points. I also checked that the pin...