OctoPrint – a new attempt
It was not so simple to set up a Raspberry Pi as a 3D-print server as I had hoped. It started with issues with the WiFi-dongle, continued to a complete…
OctoPi – WiFi issues
Next step in my journey into 3D-printing would be to set up a server to remote-control my 3D-printer. Since two weeks ago I have a spare Raspberry Pi 2 lying…
A shakeproof washer and a nut secure the M3 screw.
Improving the Wanhao Duplicator i3 – Part 1
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…
Der Wanhao Duplicator i3.
The future is here…
a
Counterfeit chips – again
It's been a while since I exposed my students to counterfeit chips from dubious eBay channels, but now it has happened again. For a couple of projects I provided my…
Pinout of the 2SS52M magnetic sensor according to the March 2016 datasheet from Honeywell.
Don’t trust the datasheet!
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 use.
Since I didn’t know the exact pinout of these TO-92-similar devices, I asked Google. The first link after the advertisements was the direct link to the datasheet on Honeywell’s homepage.
Happily I realized that it was supposed to have the same pinout as the more common Hall-effect sensors, e.g. the venerable A3144 from Allegro. When my AVR-programmer decided to switch itself off after connecting the finished circuit I got a bit suspicious, but not suspicious enough to not burn up two out of three of my sensors.
What had happened?
Well obviously there is a printing error in Honeywell’s most recent datasheet, dated March 2016. Figure 3 should show the pinout of the sensor, but if you compare it to an older (less fancy) version of the datasheet, which the internet hadn’t forgotten, then you will see the difference. I assume that Honeywell has not changed the actual pinout of the devices in production – let’s see and wait if they will answer my email pointing out their mistake.
