Another Very Busy Week

tmp9710I’ve been working on all sorts of projects this week, some more successful than others.

I have a new Owon digital Bluetooth multimeter, I’ve done the first of a pair of videos on the Tarantula 3d printer, got my new Doogee Mix 2 smartphone – but first….


tmpDEB6Remember those AleExpress ESP8266 boards with OLED built in? Well, I was falling in love with them for a while as it saves a little wiring and they’re really neat – but then I noted the price go up to way past the cost of an ESP8266+OLED.. and I could even handle that until… SNAP, off came the USB connector.

I’ve done that TWICE now and I am NOT buying any more. the connector for the microUSB simply lies on top of the board and is soldered to  two TINY pads. Had they had the common sense to use bigger pads and/or put a couple of VIAS in, they might’ve been a little more robust but as it is, the whole lot rips off at the drop of a hat and takes the 4 tiny USB wires with it. Repair is all but impossible.   Be warned.  Elsewhere in here there’s a fellow doing a new PCB to handle ESP12 and a 128*64 OLED – so keep an eye out for that.  Other suggestions welcome but beware that some of the products out there, instead of using GPIO4 and GPIO5 for the I2c use different pins or even use SPI – which I could see the point of on a larger display but losing another pin for that tiny display…. erm, no thanks.

OWON B35T+ Digital Bluetooth Multimeter

A new meter turned up for me this morning so I spent part of the morning putting together a video. Finally I can throw away that cheap rubbish meter of mine that fared so badly when tested with the new voltage reference board. See how the Owon manages – and check out the Android App shown on the video.


The + on the end of the name indicates onboard memory. You can initiate recording from the APP in offline mode at which point the meter itself will start recording up tot 10,000 readings. When the app is next connected these can be read back in for viewing.

Tevo Tarantula Printer

I’ve been putting off doing the video for this one as I had some issues – but finally decided to release a part 1 video of the package opening and starting construction. As things stand right now I am in the process of removing (with difficulty) a super thin coating of ABS from the base and learning how to feel violently ill with nail varnish remover at the same time. I’m sure once you’ve messed around with 3D printers for a while, putting a kit together and getting it going is a breeze but for me, totally green on the subject, things didn’t QUITE go as easily as planned.  If you notice any mistakes in this paragraph it is because my head is spinning from excess Acetone (all very nice saying keep a flow of fresh air but it is pouring with freezing cold rain out there).


The New Doogee Mix 2 Phone

Meanwhile my new Doogee Mix 2 phone turned up last week and after getting used to it decided to do a short video on it.  All I can say is apart from one question over the second back camera – which doesn’t seem to do a lot, this was a great decision.


Hope you found that useful. I also got a couple of 24v 12 amp switched mode supplies but you can’t really write much about supplies unless you can test them and I’m still waiting for my programmable test load to turn up – so more on that one later.


33 thoughts on “Another Very Busy Week

  1. Hey Pete,

    I’ve just written a new Linux client for the Owon B35 multimeter. Apparently they changed the chip mid last year and the data transfer protocol changed which broke existing clients.

    I’ve designed my client in the classic Unix tool tradition of doing one thing very well so that it can feed into other tools like gnuplot and mosquito_pub – yep, you can publish real time measurements onto MQTT!

    Check it out at

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