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 Yesterday I got my Winhao Duplicator i3 and when I was setting it up and adjusting the print bed I thought: “Is it supposed to be like this?” The print bed is a heated aluminum plate which is mounted on top of the Y-axis sled by four M3 screws, one in each corner. These […] Continue reading Improving the Wanhao Duplicator i3 – Part 1  …it arrived by mail today – and I couldn’t wait… The Wanhao Duplicator i3.  It’s been a while since I exposed my students to counterfeit chips from dubious eBay channels, but now it has happened again. Texas Instruments SN754410 dual H-bridge For a couple of projects I provided my students with dual H-bridge drivers, the Texas Instruments SN754410. I had a couple of these in my […] Continue reading Counterfeit chips – again  Today I wanted to use a magnetic sensor for a small project. I had three Honeywell 2SS52M sensors in my stock – a magnetoresistive switch, more sensitive than your usual Hall-effect based ones. For my project it didn’t matter, but since I had these lying around I could as well put them to some […] Continue reading Don’t trust the datasheet!  Blackboards during the last lecture in the course Electronics I.  A couple of years ago I mounted an Atmel STK500, a couple of breadboards and a power supply in a briefcase. This allowed me to bring test circuits to my lectures and demonstrate them in the class room. The briefcase with the STK500 still mounted. Since I now have abandoned the STK500 […] Continue reading A portable electronics bench I just watched some videos and got inspired… Are Your Capacitors Installed Backwards? Capacitors 1965 US Air Force Training Film  After the first two parts of this series ATmega328P – measuring its own supply voltage ATmega328P – measuring its own supply voltage II where I investigated the possibility of the Atmel ATmega series microcontrollers to select the internal bandgap voltage VBG as input for the analog-to-digital converter. Using the analog supply voltage AVcc as […] Continue reading ATmega328P – measuring its own supply voltage III  Here is a brief follow up from yesterday’s post on the internal reference voltage VBG of the ATmega328P. I wrote a small test program where I wait for a variable delay time after switching the input multiplexer of the analog-to-digital converter to the internal bandgap reference voltage VBG. Using the AVcc of as the […] Continue reading ATmega328P – measuring its own supply voltage II  The trick is not new, it is utilized in the AVR transistor tester which you can buy for quite cheap money from China, and it has been discussed in internet forums for almost 10 years (see below for some links). The Atmel AVR microcontrollers feature an analog to digital converter (ADC) equipped with […] Continue reading ATmega328P – measuring its own supply voltage |
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