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by Z80 Refugee
Mon Jun 18, 2018 7:47 am
Forum: Off topic discussion
Topic: Digital TC Soldering Station (UK)
Replies: 15
Views: 2278

Re: Digital TC Soldering Station (UK)

Heater wrote:
Mon Jun 18, 2018 1:56 am
I can always hack up some kind of guard ring and glue it on there.
Yes, do that. The Antex guard is still a guard - although small, it is enough to stop it slipping. The TS lacks any kind of guard at all.

Possible solution: https://sugru.com/buy/original-formula-black-8-pack
by Z80 Refugee
Sun Jun 17, 2018 8:46 pm
Forum: Off topic discussion
Topic: Digital TC Soldering Station (UK)
Replies: 15
Views: 2278

Re: Digital TC Soldering Station (UK)

Heater wrote:
Sun Jun 17, 2018 1:21 pm
In fact I don't even have a TS100 yet.
So your "I wouldn't bother with that" is based on nothing? Tsk.

I recommend you think twice before getting the TS100: there is no guard on the handle, so it would be very easy for fingers to slip onto the hot bit.
by Z80 Refugee
Sun Jun 17, 2018 8:30 pm
Forum: Other programming languages
Topic: Accessing GPIO I/O Pins from Forth, and How to Use Them
Replies: 35
Views: 16351

Re: Accessing GPIO I/O Pins from Forth, and How to Use Them

You should also note that on the original Pi B the 26-pin numbering was slightly different. Pins 3 and 5 were GPIO0 and GPIO1 (BCM), still with the 1K8 pull-ups and available for general use, and Pin 13 was GPIO21. Thanks for the alert. My research indicates the above only applies to the Rev 1 boar...
by Z80 Refugee
Sun Jun 17, 2018 7:30 pm
Forum: Beginners
Topic: Wiring a Switch to the Pi
Replies: 5
Views: 2668

Re: Wiring a Switch to the Pi

I have a switch like the one below how do you wire this to the raspberry pi? swslidestddps_sml.jpg I tried to follow this article http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/buttons_and_switches/ but I could not work out how to wire it. Could someone please explain or send a pictur...
by Z80 Refugee
Sun Jun 17, 2018 11:50 am
Forum: Other programming languages
Topic: Accessing GPIO I/O Pins from Forth, and How to Use Them
Replies: 35
Views: 16351

Hardware Interfacing

Now moved to the hardware section: viewtopic.php?p=1330183#p1330183
by Z80 Refugee
Sun Jun 17, 2018 11:29 am
Forum: Off topic discussion
Topic: Digital TC Soldering Station (UK)
Replies: 15
Views: 2278

Re: Digital TC Soldering Station (UK)

This was never intended to be a "mine's better than yours" face-off, just alerting UK forum members to the availability (and I note your link is for Aus). However, yours looks nice - although considerably more expensive, and the tips will be more expensive. For tin/lead I rarely even get m...
by Z80 Refugee
Sun Jun 17, 2018 9:57 am
Forum: Off topic discussion
Topic: Digital TC Soldering Station (UK)
Replies: 15
Views: 2278

Digital TC Soldering Station (UK)

In case anyone is in need of a new (or better) soldering iron: Aldi currently have one of their "specials"* - a Work Zone (own-brand) soldering station comprising a stand (with sponge tray), the iron itself (with three tips, threaded fitting), and a control box with LCD digital temperature...
by Z80 Refugee
Sun Jun 17, 2018 8:28 am
Forum: General discussion
Topic: What to do with this thing?
Replies: 26
Views: 2718

Re: What to do with this thing?

I feels as though this thing is too dumbed down to be useable for me. It seems to me you were expecting too much. The RPi is not a PC minus peripherals, it was a cheap-and-cheerful means to put hands-on computing electronics into the hands of children and educationists, and then massively adopted b...
by Z80 Refugee
Sat Jun 16, 2018 7:47 am
Forum: General discussion
Topic: Arduino board for only I/O purposes
Replies: 7
Views: 907

Re: Arduino board for only I/O purposes

Which Arduino board (for I/O applications) should I buy and where please? Your question has already been answered: Have you seen this HAT? https://www.dfrobot.com/product-1211.html HATs are designed to plug straight onto the RPi GPIO, and this HAT has a 5V Arduino complete with all the voltage leve...
by Z80 Refugee
Sat Jun 16, 2018 7:37 am
Forum: Beginners
Topic: Read state of a 12v realy
Replies: 4
Views: 538

Re: Read state of a 12v realy

Keep it simple. Question 1: is there a spare contact on the relay, or do you have to monitor the drive to the relay coil only?
by Z80 Refugee
Fri Jun 15, 2018 10:11 pm
Forum: Graphics, sound and multimedia
Topic: How do I add a headphone jack?
Replies: 16
Views: 2994

Re: How do I add a headphone jack?

I can't tell you which contact is which on that photo of the socket - you will need to work that out for yourself (it's not rocket science). I would have thought the rest was pretty straightforward (now you have established the negatives are common) too: common the negatives and take them to the neg...
by Z80 Refugee
Fri Jun 15, 2018 8:30 am
Forum: Beginners
Topic: Fan on Pi
Replies: 14
Views: 1766

Re: Fan on Pi

If you want a fan to run continuously, use a 5V fan and connect it to the 5V pin on the GPIO or plug it into the USB socket. Transistors are only required if you want to turn the fan on and off under program control.

viewtopic.php?p=1317939#p1317939
by Z80 Refugee
Thu Jun 14, 2018 9:42 pm
Forum: Graphics, sound and multimedia
Topic: Beat Detection, BPM Averaging, LED Trigger
Replies: 2
Views: 2535

Re: Beat Detection, BPM Averaging, LED Trigger

Beat detection is trickier than you seem to think. I recommend you read up about it. https://en.m.wikipedia.org/wiki/Transcription_(music)#Beat_detection https://en.m.wikipedia.org/wiki/Beat_detection Implementing it in an RPi will require DSP (digital signal processing) operations, and (in the firs...
by Z80 Refugee
Thu Jun 14, 2018 9:38 pm
Forum: Graphics, sound and multimedia
Topic: SMS photo gallery to LED sign
Replies: 1
Views: 497

Re: SMS photo gallery to LED sign

How do you plan to link the RPi to the mobile phone network to receive the MMS in the first place? Once you've done that, sure the rest is possible.

It would be easier to receive an image in an email.
by Z80 Refugee
Thu Jun 14, 2018 9:34 pm
Forum: Camera board
Topic: CAMERA AS A REAR-VIEW MIRROR
Replies: 5
Views: 2682

Re: CAMERA AS A REAR-VIEW MIRROR

Is this a fun project or a serious requirement? If the latter, just go and buy a commercial reversing camera system - it won't work out any more expensive.
by Z80 Refugee
Thu Jun 14, 2018 9:26 pm
Forum: Automation, sensing and robotics
Topic: Powering project question
Replies: 3
Views: 819

Re: Powering project question

The supply variations caused by motors at the various conditions they can face are very difficult to accommodate when also trying to power sensitive (and power-hungry) electronics systems. Save yourself a lot of grief and use separate batteries.
by Z80 Refugee
Thu Jun 14, 2018 9:20 pm
Forum: General discussion
Topic: Why do some people prefer a cluster of RPis over AWS?
Replies: 35
Views: 4919

Re: Why do some people prefer a cluster of RPis over AWS?

When an engineer posts a question related to a commercial product, the answer is usually that the Pi was designed as a real computer that children can own and not as a mission critical device for industrial control. Except, as an engineer, I was criticised for saying that and told that the Compute ...
by Z80 Refugee
Wed Jun 13, 2018 12:20 pm
Forum: Beginners
Topic: Radio Receiver
Replies: 7
Views: 1367

Re: Radio Receiver

I mean a similar radio chip that is fully compatible with RPi There's nothing "incompatible" about the TEA5767 - I just told you to make sure it would be OK running at 3.3V instead of the Arduino 5V, and the post above says it is. The rest is learning how to code the RPi to run it. The on...
by Z80 Refugee
Wed Jun 13, 2018 12:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Circuit using a MOSFET to control power
Replies: 7
Views: 4031

Re: Circuit using a MOSFET to control power

I believe this should work but I'd like some confirmation. Thanks! I don't think it will, and I seem to have some agreement on that. For some design principles on circuits I, personally, know will work, take a look at my guide: https://www.raspberrypi.org/forums/viewtopic.php?f=34&t=207597 (scr...
by Z80 Refugee
Wed Jun 13, 2018 11:58 am
Forum: Advanced users
Topic: Brief voltage drop on UPS like system. would a capacitor fix it?
Replies: 53
Views: 9546

Re: Brief voltage drop on UPS like system. would a capacitor fix it?

Any progress here? I will happily send you a couple of Schottky diodes to test, but now this forum does not allow PMs we have no means to exchange contact details in private.
by Z80 Refugee
Wed Jun 13, 2018 9:46 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Circuit using a MOSFET to control power
Replies: 7
Views: 4031

Re: Circuit using a MOSFET to control power

The other link had the load between the power source and drain side of the MOSFET and the source goes to ground. Either way works. Really? The illustration now available in the first post looks completely weird (although I did say I have little experience of FETs). I would be happier with the sourc...
by Z80 Refugee
Wed Jun 13, 2018 9:40 am
Forum: Beginners
Topic: Radio Receiver
Replies: 7
Views: 1367

Re: Radio Receiver

finnbo11 wrote:
Tue Jun 12, 2018 10:41 am
I've done a bit of work with Arduino. Is there anyway I could feed data to the RPi.
Plenty. A standard serial data link seems favourite.
finnbo11 wrote:
Tue Jun 12, 2018 10:41 am
Or alternatively is there another similar chip I could use?
For what?
by Z80 Refugee
Wed Jun 13, 2018 9:34 am
Forum: General discussion
Topic: Released button.
Replies: 4
Views: 658

Re: Released button.

Your button will not be reliable unless it is wired correctly. See the link below, and scroll down to "Hardware Interfacing".

viewtopic.php?f=34&t=207597
by Z80 Refugee
Tue Jun 12, 2018 9:03 am
Forum: Beginners
Topic: Beginner - Home Automation Advice
Replies: 9
Views: 1535

Re: Beginner - Home Automation Advice

The "feedback" is an issue for radio and mains-borne home automation systems such as X10. You need to be looking at IP remote controlled sockets and the like (probably WiFi), or a full bespoke setup with RPis communicating to other RPis. Bear in mind that there are already commercial offer...
by Z80 Refugee
Tue Jun 12, 2018 8:15 am
Forum: Beginners
Topic: Radio Receiver
Replies: 7
Views: 1367

Re: Radio Receiver

I want to use a tea5767 chip as it has an inbuilt amplifier. I've had a quick squint and the examples seem to be for Arduino. Be aware that the Arduino used 5V but the RPi used 3.3V (even if 5V is available from the GPIO and USB etc). You will need to make sure the electrical interface is OK (or ad...

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