Recent content by nzfarmer

Numerous times I want to validate the control logic of a heatpump or similar. Sometimes I may want to override the actual sensor value, other times I want to simulate it, and other times I'll want to pass it through but monitor it in real time. And ideally the device will support multiple (say...

It works out of the box, but is a little underpowered, and anything past 15.00hz and the motor starts to squeal. (Note: fixed this by increasing the carrier frequency to 110). A few other queries - I see it exposes P+ and PB for breaking. I had hoped these could be used for access to the high...

I've bought a second hand bore pump. A thing of beauty - a 1.5kw single phase mono pump, with external start capacitor setup. Well, it was cheap, and the start box was missing, and it appears the main shaft to the mono pump is unscrewed. It is also over kill for our small well. But as an...

Hi guys, I'm an old school software engineer. Started hacking with Linux over 30 years ago. Went on to university. Followed the money into analyst programmer roles, then IT consulting. Tried escaping it a few times, but for my sins I've found myself back on the tools working as an embedded...

Well after 30 years of working with Linux, and around 10 using it in anger for control system automation, it was a pleasant surprise to stumble across another wee utility to add to our toolset. cpulimit does exactly what it promises. You pass it a limit value in % of available CPU and a program...

Hi all Am looking for recommendations for CO2 sensors for an automated grow room. I have tried prototyping a data logger using two devices already with very disappointing results. The MH-Z19 and an SM300D2. When a pair of either of these are left running, the CO2 readings are typically...