I did a project on temperature/humidity logging a couple of years ago. In that project I logged the temperature and humidity readings in my basement lab over the course of a year. One issue with the approach I took back…
Basic constant current dummy load using an Op Amp and a by-passing MOSFET is very easy to build and had been made quite popular following Dave’s video on EEVBlog. I happened to have an old aluminum hard disk cooler case…
I got myself a Raspberry Pi (Model B V2) last month. After having played with it for a while, I have to say that I really like this tiny single-board computer. Since it runs on Linux, you can compile and…
A typical 3 ½ or 4 ½ multimeter can measure voltage in the low mV range and current in the low mA range. Voltage measurement in the µV range and current measurement in the nA range are typically only available…
It is well understood that resistors are typically binned in such a way that for a given tolerance the actual resistance values are distributed within the specified tolerance but are outside the range of the next tighter tolerance specification. So…
I bought a used Keithley 196 bench multimeter a few weeks ago. This is a 6 ½ digit 3,030,000 counts meter, capable of measuring voltages down to 100nV and currents as low as 100nA. It can also be used to…
I have been mainly using perf-boards for my electronics projects. Since most of the stuff I build are not very complicated and are one-offs, using perf-boards has been more than adequate. With that said, I did find wiring the headers…
For current measurement in the low micro-amp and nano-amp ranges, a feedback ammeter is usually an excellent choice (see Keithley Application Note 1671). Because of the very high gain of an Op-amp, the burden voltage can usually be ignored when…
I have a few Western Digital WD1001FALS 1 TB hard drives and they have been pretty reliable for the past few years until recently. One of my WD1001FALS’ died suddenly a few months ago. Since it was still under warranty,…
I did a review on Topward’s 6603A linear power supply last time. In my opinion, Topward 6000 series power supplies are really well made and offer exceptional performance. One minor annoyance though, as I mentioned, is that the two cooling…
I bought a used Topward 6603A lab power supply from eBay a couple of weeks ago and thought I would do a quick review and teardown and perform some basic measurements to see how well it was built.
Simple slave camera flash (or synchronous flash, like this one I built earlier) works great with older film cameras, but does not work with modern digital cameras. This is due to the fact that the majority of the digital cameras…
I picked up an AD9850 DDS module on eBay an couple of weeks ago and decided to build a MCU controlled DDS function generator with it to replace my crude frequency generator I built earlier.
I have created a dedicated page for the MCP2210 library documentations. An link to the reference can also be found on the side navigation pane. The Doxygen generated project documentation can be viewed directly here.
During the past few weeks, I have shown many examples (see 1, 2, 3, 4) of using the open source MCP2210 Library with SPI devices under Linux. In this post, I will conclude this series with one more example: interfacing…