Raspberry Pi Forums

Z80 Refugee

As the OP hasn't been back, we might reasonably assume the second post answered the question.

Different forums use different interfaces - he might be used to a forum that actually has the word "edit" somewhere around the post.

Z80 Refugee

I'm not seeing an image in the first post or any kind of diagram in the link in the second post. I have no direct experience of using MOSFETs (a bit of a hole in my otherwise wide experience with electronics), so I would personally probably steer towards an integrated driver with complete overload p...

Z80 Refugee

I guess that would work... worth a first try anyway (cheap and simple). The risk is that the volume will be too high for the 'phones, and there is nowhere to put attenuation without also creating cross-talk.

Z80 Refugee

The risk is that a write operation (rather than a read operation) is not completed if you just unplug it hot without unmounting first. If doing a controlled shut-down, unmounting is not necessary.

Z80 Refugee

Maybe, but the problem with that is I know of no headphones where the -ve wires for L and R are not commoned. You could re-wire some headphones so that L and R go to separate mono plugs, with two mono switched sockets, but also note that the volume levels driving speakers will probably not be approp...

Z80 Refugee

One thing I found surprising is that the spec is tighter than I thought. For example, spec says that the minimum release voltage and current is 0.25V/0.5V and 3.5mA/7mA, actually the real values are much higher ( 12mA to release ) Nothing wrong with that. The quoted values are those where the manuf...

Z80 Refugee

angus1024 wrote: ↑
Mon Jun 11, 2018 7:11 am
The SD card has not yet been undamaged.

Presumably you meant the opposite.

Z80 Refugee

There are two possibilities: the speaker driver is single ended but the -ve wires are provided separately for "convenience", or the driver is double ended. Simple test: measure the resistance between the two -ve wires, if it's zero you can combine them. If it's not zero, the speaker driver...

Z80 Refugee

You've hit the nail on the head, and that's exactly why I don't like X10 and similar home automation systems: no status return on command sent, you just have to trust that it was actioned. The reason there is no status return is because the transmission is one way - either by radio link or through t...

Z80 Refugee

Ninjasrus wrote: ↑
Sun Jun 10, 2018 12:50 am
See, view, keep an eye on, check status, monitor.

Do you mean you want to access multiple RPis across a network (use VNC), or run multiple RPis using one keyboard, mouse, and screen (use a KVM switch)?

Z80 Refugee

It's a standard part. Put "switched stereo jack socket" in the eBay search box.

Z80 Refugee

That's not what it says on the advertised product details. If you can find me a circuit diagram for the relay board I will be able to comment further.

Z80 Refugee

I didn't understand the difference between CHANNEL A and TERMINAL A, I believed it was the same... I think you mean you thought that circuit might be already built into the rotary encoder. No, the rotary encoder stops at the dashed line. The drawing in the data sheet isn't very good, confusing use ...

Z80 Refugee

hippy wrote: ↑
Fri Jun 08, 2018 11:44 am
Or alternatively run the ADS1115 off the GPIO 3.3V supply which is probably what you should be doing anyway.

Yes, that would solve the logic level compatibility problem as well.

Z80 Refugee

You need to understand that the RPi runs from 3.3V, which is regulated on-board from the "5V" input. The 5V pins on the GPIO are connected directly to the power input, so whatever you put in is what you get out. Because of the regulation, it doesn't matter to the RPi that the input voltage...

Z80 Refugee

OK, compiled for i86 then. Thanks for info.

Z80 Refugee

I don't get what you are doing here. Are you saying you are running the Raspberry Pi binaries (which are compiled for an ARM processor core) in a virtual machine running on i86 hardware??

Z80 Refugee

The datasheet for that device, as linked in the first post, shows a "suggested filter circuit". Use that, but connect to the 3.3V GPIO pin instead of 5V as shown. "Terminal A" and "Terminal B" are your inputs to the GPIO, "Terminal C" is the 0V connection. The...

Z80 Refugee

I wanted to purchase this shift register but there are different ones with similar names. Wanted to get some clarity as which I should get. STP16CP05MTR SO-24 STP16CP05TTR TSSOP24 STP16CP05XTTR TSSOP24 exposed pad STP16CP05PTR QSOP-24 Guess a little info on what I'm planning to do with it would hel...

Z80 Refugee

Simples.

Z80 Refugee

If that is too complex for your needs, just do the simple thing and use print statements to create a CSV file and then redirect the output from the script to a file, as suggested in another post here. That's my recommendation. Outputting to as plain a file as possible, and then using the import cap...

Z80 Refugee

Your current difficulties with the 2.4A adapter may be simply the length and thin-ness of the connecting wire. It's not just a question of resistance, the longer the wire is the greater its inductance and this reacts against the peaky nature of the RPi's current demand to cause even greater instanta...

Z80 Refugee

There's only one choice as far as I am concerned: 12.9" iPad Pro + Apple Pencil (if you have £850 to spare). Add the Apple Smart Keyboard for another £150 and you have a completely portable workstation. Budget a little more for top quality apps (not expensive by comparison). There are cheaper w...

Z80 Refugee

Any ideas on how to get this to output to an Excel document (or even just a normal file but preferably straight to Excel) Creating a native Excel file will be a complex process - don't bother banging your head on that one. The good news is that virtually all spreadsheet programs can take a text for...

Z80 Refugee

tlfong01 wrote: ↑
Tue Jun 05, 2018 2:46 pm
So need to google much to learn how to do it, and the precautions.

Google results will tell you everything, and the opposite, in equal measure. The difficulty is separating the wheat from the chaff.

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