Raspberry Pi Forums

Mortimer

The worst thing is that Nano is not WYSIWYG GUI. WYSIWYG is pointless and unnecessary for pure text files as they retain no visual formatting information, and line wrapping can cause confusion in my opinion. Luckily Rpi recently provides the Geany IDE for python. I sometimes use Geany in Windows 10...

Mortimer

Ah but all of that relates to the accuracy of the real time clock circuit. So "+/-2ppm from 0 to 40degC" tells you that between those temperatures the accuracy of the RTC is better than 2ppm. It says nothing about the accuracy of the temperature sensor. The +/-2degC temperature accuracy is more like...

Mortimer

What are the specifications of the modules?

I would imagine there would be a tolerance range to the accuracy. If it was +/-10% say, then all of your modules would be within spec for a temperature reading of 30C, i.e. 2 are bang on, one reads high and one reads low.

Mortimer

Yes, Codeacademy has changed, and from my POV not for the better. I can no longer recommend them, as I used to do. That's a shame, it was brilliant when I used it. I suppose it shows how quickly things change and how it is not always in a good direction. Having logged back in I see the 'free' cours...

Mortimer

Yes, Codeacademy has changed, and from my POV not for the better. I can no longer recommend them, as I used to do. That's a shame, it was brilliant when I used it. I suppose it shows how quickly things change and how it is not always in a good direction. Having logged back in I see the 'free' cours...

Mortimer

You could try this... https://www.codecademy.com Codecademy seems good if you wish to learn many programming languages in a short time and becomes a pro. But to become a codecademy pro, you need to pay up . Apologies for that, when I used Codecademy it was some time ago and I didn't need to pay for...

Mortimer

... turn any switches to on position on the project, then stand back and plug into a switched socket and turn on. Once turned on, if you intend measuring for Voltages . use one hand only, the other kept well away and behind your back I am wiring the high class 220VAC LED lamp for my studio. Your ad...

Mortimer

You could try this...
https://www.codecademy.com

Mortimer

I have one of these in a drawer at home. My Father bought it way back in the 70's:

Sinclair Cambridge Memory (type 1)

It stills works... mostly. If I recall a segment of the highest order digit has died.

Mortimer

I have recently bought some 220VAC 15W LED lamps. They use transformers (I guess from 220VAC to 12/24DAC) and say they are flicker free. Unlikely, almost always capacitive-dropper circuits nowadays. BigClive on Youtube does some interesting tear-downs of this sort of thing and reverse engineers the...

Mortimer

How about a short extension lead, so the Pi PSU can rest on top of wall bracket.

Poundland have some short 3 way extensions I have found quite useful.

Mortimer

DirkS wrote: ↑
Tue Jul 17, 2018 12:59 pm
According to the waveshare info the device uses the UART (https://pinout.xyz/pinout/uart).
You connected it to the SPI pins (https://pinout.xyz/pinout/spi)

Looks like pins 16 (BCM 23) and 20 (Ground) to me, not SPI

Mortimer

Reading the connections required for Arduino, the connections look wrong to me. Red and Black are power as far as I can tell, but you have white and blue connected to the power pins on the RPi. Are you continuing the colour convention set out in the ePaper manual or are you using different colours? ...

Mortimer

I came across this when looking at ADS-B projects on Raspberry Pi, it might help you:
https://discussions.flightaware.com/t/m ... y-pi/16421

Mortimer

You might find your motor is small enough that any arcing is minimal and unlikely to give you problems.

Mortimer

I would imagine that switching inductive mains loads (like motors) may causing momentary arcing between the relay contacts when the circuit is broken. This could possibly be inductively coupled back into the low voltage side and affect the controller or computer. Some sort of snubber network across ...

Mortimer

Once for SSH session and once for the shell login, I would guess.

Mortimer

The only problem you might have with a Permanent Magnet Synchronous Motor is it might not start by itself. They usually need either a small push to get them going, I have a clock like that. Or they need a variable frequency drive (Complicated).

Mortimer

So you had BS1362 fuses in a 6x30mm holder? If so no wonder it was unreliable. BS1362 panel fuse holders exist I believe. When you start using electric motors, you might want to consider changing any glass fuses in circuit to ceramic ones, like the BS1362. Genuine BS1362 fuses have quartz sand in th...

Mortimer

As a general rule, yes, but a fuse-holder is hardly a complicated thing and even a cheap one should serve its purpose.

Just had a thought... Have you got the correct sized fuse in the holder? Is it possible the fuses you have are too short for the holder and not pressing the contacts properly?

Mortimer

Ah! But those checks are not "testing" the project in the same sense that TDD uses testing. In TDD the tests are to see that the desired functionality of the project is being achieved. The checks you made were simply checks that the thing was safe to even turn on. I would also say that this is not a...

Mortimer

The checking was worthwhile then?
Good job!

Mortimer

I would have expected "wind_speed" to be a rolling average over a shorter time period. At the moment it looks to me like it is the mean of all speed measurements since the program started running. So in theory if the wind died completely and didn't pick up again, the read-out of wind_speed would nev...

Mortimer

I'm 86yrs and still learning, :shock: Wow! Good going. Gives us all hope! :lol: My grandmother learned to use a computer for word processing, printing, emails and a little web browsing at the ripe age of 88, and was using a computer up until the age of 94 when her eyesight let her down. No computer...

Mortimer

Looks good.

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Re: Relay Module KY-019 5V

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Re: "Low depth" power supply

Re: Waveshare 4.3 e-Paper

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Re: wireshark capture of the USB traffic

Re: Relay Module KY-019 5V

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Re: MOTD print twice when login SSH

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Re: Windspeed won't go to zero

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