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by Hairyloon
Sun Jul 14, 2019 1:42 pm
Forum: General discussion
Topic: Using differential inputs on PCF8591
Replies: 0
Views: 90

Using differential inputs on PCF8591

I want to use an RPi with a PCF8591 to measure a voltage difference, the PCF8591 can be configured to do this. I understand that I would need to set the control byte to the appropriate value, but I don't know how to do that. I want to do it in C, because I have come to the opinion that I really don'...
by Hairyloon
Tue Jun 04, 2019 1:51 am
Forum: Beginners
Topic: wifi on raspberry pi 2
Replies: 2
Views: 131

Re: wifi on raspberry pi 2

i have a raspberry pi 2 with me and it has no inbuilt wifi , how i can access net in that pi.... can i use esp8266 esp 01 module for accessing wifi in it.... if yes how to connect esp8266 esp 01 module to raspberry pi 2 for accesing internet. It is fairly straightforward to connect an ESP-01 to a R...
by Hairyloon
Sun May 12, 2019 11:52 am
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

I've tried a new drive and it works fine with a PC, but I guess that the RPi is simply not man enough for the task: it is only a Pi-Zero I'm using at the moment, I suppose that was a bit optimistic.
Any means by which I can make it work, or if not what would be the minimum spec needed to play a film?
by Hairyloon
Tue May 07, 2019 7:00 pm
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

Next I wondered if it had only pretended to install all fine with that method, so I downloaded the tarball & did the business... Same result. And then, after all that it turned out the drive was a bit knackered. :oops: I tried another disk & while I can't say it works fine, it does at least sort of ...
by Hairyloon
Tue May 07, 2019 1:53 pm
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

Thanks for the tip... Alas, I cannot get it to work. :( Can you post something, anything about what you tried and what didn't work? The more detail the better. I thought I'd try with a clean install, which was not as straightforward as it might've been, but no matter. I've followed the instructions...
by Hairyloon
Sat May 04, 2019 11:54 pm
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

echmain wrote:
Sat May 04, 2019 11:30 pm
Hairyloon wrote:
Sat May 04, 2019 9:34 pm
Thanks for the tip... Alas, I cannot get it to work. :(
Can you post something, anything about what you tried and what didn't work? The more detail the better.
Let me just try it again, so i can give a better answer to that...
by Hairyloon
Sat May 04, 2019 11:08 pm
Forum: Troubleshooting
Topic: Screen blinking off intermittently.
Replies: 2
Views: 102

Re: Screen blinking off intermittently.

Some HDMi-VGA adaptors require extra power, but as you have not provided any useful information such as.... make / model adaptor There is no means by which to provide power to the adaptor and no maker's label. model of RPi I've tried with a Pi Zero and a Pi ZeroW, what are you using for a power sup...
by Hairyloon
Sat May 04, 2019 9:34 pm
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

Thanks for the tip... Alas, I cannot get it to work. :(
by Hairyloon
Sat May 04, 2019 9:54 am
Forum: Troubleshooting
Topic: Screen blinking off intermittently.
Replies: 2
Views: 102

Screen blinking off intermittently.

I have an RPi plugged into an old TV through a HDMI-VGA adaptor and periodically it blinks off for a moment.
If it is off for a longer moment, the TV displays "No signal".
Any ideas?
by Hairyloon
Sat May 04, 2019 9:13 am
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

Great, thank you. I'll give that a try.
by Hairyloon
Sat May 04, 2019 7:52 am
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

Any suggestions on further diagnosis or repair?
The obvious answer is a badly soldered header, but it's no easy task to unsolder it only to find out that it's something else...
by Hairyloon
Sat May 04, 2019 7:49 am
Forum: General discussion
Topic: Getting External CD/DVD Drive to Work on Raspberry Pi?
Replies: 18
Views: 13643

Re: Getting External CD/DVD Drive to Work on Raspberry Pi?

I hope people don't mind me resurrecting this thread, but I am wondering about using a RPi as a DVD player. I've set it up with a drive and it recognises the drive and reads DVD ROMs without trouble, but it doesn't even see the disk when I put in a DVD film. I understand that I may need to buy a lic...
by Hairyloon
Fri Mar 15, 2019 1:15 pm
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

Turns out to be (probably) a faulty Pi. Tried the same SD card & same screen on another Pi & it worked no problem...
by Hairyloon
Thu Mar 14, 2019 3:19 pm
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

So I2C is working. In that case the device is not connected to the I2C bus. A clear photo showing the connections may help. This is the obvious answer, but I have checked and re-checked. Even to the extent of swapping the wires over in case they are mislabelled... A multimeter tells me that volts a...
by Hairyloon
Thu Mar 14, 2019 1:08 pm
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

... Ebay, I've tried two screens and an I2C radio. Both screens work with an arduino so I don't think they're the problem. I can't sort out pictures or a manual right now, but if they're important then I'll do it later. Are they five volt devices or did you use a 3v3 Arduino? They claim to work on ...
by Hairyloon
Wed Mar 13, 2019 9:30 am
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

Re: I2C not detected.

What is the response to i2cdetect -y 1? "Doesn't find anything... In fact, it doesn't *do* anything: it wants to be run as root, but then it doesn't find anything..." does not help. A table full of dashes. In the ‘more or less’ step - did you enable I2C in raspi-config? Yes. How do you have the scr...
by Hairyloon
Tue Mar 12, 2019 11:09 pm
Forum: Troubleshooting
Topic: I2C not detected.
Replies: 11
Views: 543

I2C not detected.

I'm trying to connect an OLED screen to an RPI zero through I2C. They look a little out of date, but I followed the instructions here (more or less), but i2cdetect -y 1 Doesn't find anything... In fact, it doesn't *do* anything: it wants to be run as root, but then it doesn't find anything... I've t...
by Hairyloon
Tue Nov 27, 2018 5:57 pm
Forum: Beginners
Topic: LM225X LCD display.
Replies: 0
Views: 144

LM225X LCD display.

I bought this display many, years ago with intent, and never quite got to grips with how to put it to work... That was in the days before Raspberry Pi came out, and while there are now far better displays around, I thought I would at least have a crack at making it go. The first problem is that the ...
by Hairyloon
Tue Mar 13, 2018 7:08 pm
Forum: General discussion
Topic: Elonex One as Pi shell?
Replies: 0
Views: 143

Elonex One as Pi shell?

I have here (somewhere) an Elonex One (Or is it One plus?) mini laptop thing. It doesn't work well & I was wondering about ragging out the engine and putting a Pi in instead.
Has anyone done it, or thought about it any?
Is it likely to be a major headache connecting the screen and getting it to work?
by Hairyloon
Sun Oct 29, 2017 11:28 pm
Forum: Automation, sensing and robotics
Topic: Using disk drive motors.
Replies: 7
Views: 1050

Re: Using disk drive motors.

There are some very inventive people out there using disk drive motors e.g: https://www.youtube.com/watch?v=jEzXjJN1RH0 https://www.youtube.com/watch?v=e0NVFbBVFXw https://www.youtube.com/watch?v=zsVjCZG4cyI No, sorry that is just too silly... I think that you will find that disk drive motors r ste...
by Hairyloon
Fri Oct 27, 2017 6:30 pm
Forum: General programming discussion
Topic: Testing the output.
Replies: 6
Views: 1969

Re: Testing the output.

Good ideas, thank you.
Turned out I had it completely wrong that time, but the suggestions will likely be useful down the line sometime.
by Hairyloon
Fri Oct 27, 2017 6:16 pm
Forum: Automation, sensing and robotics
Topic: Using disk drive motors.
Replies: 7
Views: 1050

Using disk drive motors.

I expected this subject to be widely covered somewhere, but I have not found it. I admit that I've not looked terribly hard, but the search engine here isn't working just now and in any case I thought a conversation might be helpful. Anyway, as I am sure we all know, disk drives have various motors ...
by Hairyloon
Sun Sep 24, 2017 12:19 pm
Forum: General programming discussion
Topic: Testing the output.
Replies: 6
Views: 1969

Testing the output.

I'm trying to write a programme that sends a binary signal down the GPIO; the signal should turn on a device. It has not had the desired result, but I do not know if it is because the code is wrong, the data is wrong or the hardware is faulty. Is there some clever way to test the output of a GPIO pi...
by Hairyloon
Sat Sep 23, 2017 10:22 am
Forum: Troubleshooting
Topic: Stalled system? Is it dead, or just pi-ning..?
Replies: 4
Views: 448

Re: Stalled system? Is it dead, or just pi-ning..?

Problems like that are often power related... That thought occurred to me on the way to bed so I tried a powered hub first thing today: works fine. :roll: Only thing is that it's drawing power from the hub rather than the power supply. I cannot see how that can possibly be a problem, but I thought ...
by Hairyloon
Sat Sep 23, 2017 2:52 am
Forum: Troubleshooting
Topic: Stalled system? Is it dead, or just pi-ning..?
Replies: 4
Views: 448

Stalled system? Is it dead, or just pi-ning..?

I'm trying to set up an old Pi model B. I've installed Rasperian off NOOBS and it appears to boot up well enough, but then it doesn't respond to the keyboard and the mouse doesn't even light up. :? Except that isn't entirely true because some of the times, the keyboard *does* work, and it does appea...

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