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Fri Jul 30, 2021 10:55 am
Forum: Beginners
Topic: LEDs?
Replies: 33
Views: 662

### Re: LEDs?

No, they couldn't. The V f of these LEDs can be 2V5. hat is too high for reliable operation in series with a 5V supply. Oh? Yes they could. No, they could not, unless my calculator is broken 2.5 + 2.5 = 5V leaving exactly ZERO volt over the series resistor, so no current will flow. Obviously theory...
Thu Jul 29, 2021 10:23 pm
Forum: Beginners
Topic: LEDs?
Replies: 33
Views: 662

### Re: LEDs?

So I made the circuit above, due to not wanting to mess with the original circuit as my first preference, and it works! However... the after the Pi has shutdown the power led stays on extremely dim. I've tried increasing the resistance between 5v and the transistor, and also between the transistor ...
Thu Jul 29, 2021 10:19 pm
Forum: Python
Topic: Before I build, scoreboard questions.
Replies: 6
Views: 174

### Re: Before I build, scoreboard questions.

You could do it with an Arduino and an MP3 shield, but the Pi Pico is so hot right now. :lol: I considered an Arduino but have no working knowledge with them. I have at least some knowledge with Pi's That doesn't matter. The important thing is being able to articulate what you want to do, which you...
Thu Jul 29, 2021 10:10 pm
Forum: Beginners
Topic: LEDs?
Replies: 33
Views: 662

### Re: LEDs?

leds.png So I made the circuit above, due to not wanting to mess with the original circuit as my first preference, and it works! However... the after the Pi has shutdown the power led stays on extremely dim. I've tried increasing the resistance between 5v and the transistor, and also between the tr...
Thu Jul 29, 2021 10:02 pm
Forum: Beginners
Topic: LEDs?
Replies: 33
Views: 662

### Re: LEDs?

davidcoton wrote:
Wed Jul 28, 2021 5:04 pm
ame wrote:
Wed Jul 28, 2021 10:42 am
Or those LEDs could be in series, with one dropper resistor.
No, they couldn't. The Vf of these LEDs can be 2V5. hat is too high for reliable operation in series with a 5V supply.
Oh? Yes they could.
Thu Jul 29, 2021 7:12 am
Forum: Wanted
Topic: Where to hire RPi experts?
Replies: 8
Views: 341

### Re: Where to hire RPi experts?

I will be looking to hire an experienced Pi developer in the near future for a relatively short-term contract project. I don't see a "Jobs" subforum here. So I have two questions: 1. Is there anywhere on these forums where a post about a job/project opening would be appropriate? 2. What j...
Thu Jul 29, 2021 7:09 am
Forum: Python
Topic: Before I build, scoreboard questions.
Replies: 6
Views: 174

### Re: Before I build, scoreboard questions.

You could do it with an Arduino and an MP3 shield, but the Pi Pico is so hot right now.
Wed Jul 28, 2021 10:42 am
Forum: Beginners
Topic: LEDs?
Replies: 33
Views: 662

### Re: LEDs?

rpdom wrote:
Wed Jul 28, 2021 8:22 am
I can help with a diagram. I believe this is what is required.
LEDs.png
Or those LEDs could be in series, with one dropper resistor.
Tue Jul 27, 2021 10:45 am
Forum: Beginners
Topic: Connect two limit switches on the same axis
Replies: 2
Views: 98

### Re: Connect two limit switches on the same axis

Here you are. A schematic and a pinout listing. https://gojimmypi.blogspot.com/2020/10/cnc-3018-makerbot-limit-switch-wiring.html If you are connecting it to the Pi GPIO then you should connect VCC to 3.3V. If you connect it to 5V you will damage your Pi. Connect GND to GND. Connect the switch outpu...
Mon Jul 26, 2021 11:27 am
Forum: Other projects
Topic: Looking for a large display
Replies: 2
Views: 106

### Re: Looking for a large display

Mon Jul 26, 2021 8:22 am
Forum: Python
Topic: python coding for voltage relays
Replies: 32
Views: 924

### Re: python coding for voltage relays

If_i_only_knew101 wrote:
Mon Jul 26, 2021 8:19 am
I have both a HDMI and dsi 12" TFT connected to the pi4, I don't really wish to add i2c display. The pi is hidden and mounting another display will be a nightmare.

As you were, then.
Mon Jul 26, 2021 7:16 am
Forum: Python
Topic: python coding for voltage relays
Replies: 32
Views: 924

### Re: python coding for voltage relays

Sooo, then, how cool would it be to have a small display dedicated to the task of showing the numbers? You'll probably be even more excited to learn you can turn LEDs on and off under the control of your program. If you really want to get your hands dirty then stick around and ask questions. For sta...
Mon Jul 26, 2021 1:23 am
Forum: General discussion
Topic: Security Camera without Internet
Replies: 3
Views: 137

### Re: Security Camera without Internet

Yes. You are missing something. Even if you don't use the Internet you still need a network. The network can simply be two devices connected somehow. And these days the most common way to do that is by WiFi or Ethernet. So, your Pi running motioneyeOS could be an access point. Connect your phone or ...
Mon Jul 26, 2021 12:46 am
Forum: General discussion
Topic: Security Camera without Internet
Replies: 3
Views: 137

### Re: Security Camera without Internet

Try motioneyeOS.
Sun Jul 25, 2021 10:13 am
Forum: Python
Topic: python coding for voltage relays
Replies: 32
Views: 924

### Re: python coding for voltage relays

Thanks, now I can sell tickets to see how lost I am... Is the above a app? Is there something easier to understand and imports a .py file to execute? Try the tutorial, without thinking about your particular purpose. Have a go at making the demo as shown in the tutorial, then, once that has settled ...
Sun Jul 25, 2021 7:18 am
Forum: Gaming
Topic: Games for babies
Replies: 6
Views: 264

### Re: Games for babies

Sat Jul 24, 2021 10:52 am
Forum: Automation, sensing and robotics
Topic: Recommendations for external project box connectors
Replies: 2
Views: 194

### Re: Recommendations for external project box connectors

Here you are. Search SP16, or SP13 on AliExpress.

https://m.aliexpress.com/item/4000057522634.html

Or aviation connector. Or waterproof connector. Of the name of what you've been buying. Probably a "compatible" version is available cheaply.
Thu Jul 22, 2021 9:24 pm
Forum: Other projects
Topic: Looking for some help with a few projects
Replies: 1
Views: 137

### Re: Looking for some help with a few projects

For the DVR take a look at motioneyeOS. For Excel- you can't run Windows on a Pi. You might be able to run the online version of Excel on the web through a browser on the Pi. You can run LibreOffice on the Pi, so you could try LibreOffice Calc and wean yourself off Excel so that you are no longer be...
Thu Jul 22, 2021 9:12 pm
Forum: Python
Topic: python coding for voltage relays
Replies: 32
Views: 924

### Re: python coding for voltage relays

Ok. I think I see the problem. You have a for loop which is cycling through the channels and getting voltage readings, but you are always switching the same relay (I'll call it the relay, because you are only driving one). Basically, your program is doing this: Get voltage from in0 Make a decision a...
Thu Jul 22, 2021 9:39 am
Forum: Python
Topic: python coding for voltage relays
Replies: 32
Views: 924

### Re: python coding for voltage relays

Or just elif value < 13.300: Also, I'd recommend putting some comments in explaining what you are doing and why. Yes, we can see what the code does, but there is nothing to explain why things are as they are, nor anything to say what you are trying to achieve. If you do that it will help your future...
Sat Jul 17, 2021 1:17 pm
Forum: C/C++
Topic: sense rotary encoder angle and display angel using SPI in raspberry pi
Replies: 2
Views: 198

### Re: sense rotary encoder angle and display angel using SPI in raspberry pi

You need to know which model you have. It seems from the link you gave that there are six variants. You also need the datasheet for the model that you have. Unfortunately the datasheet link seems to be broken. If you ask the manufacturer or supplier for a datasheet it might help you. If it doesn't h...
Fri Jul 16, 2021 10:26 pm
Forum: General discussion
Topic: Power Supply for Raspberry 4 bad design for Australia
Replies: 89
Views: 2693

### Re: Power Supply for Raspberry 4 bad design for Australia

jbudd wrote:
Fri Jul 16, 2021 10:13 pm
Speaking as someone who has lost close relatives to covid I'd say that's in bad taste.
I'm sorry for your loss.
Fri Jul 16, 2021 10:06 pm
Forum: General discussion
Topic: Power Supply for Raspberry 4 bad design for Australia
Replies: 89
Views: 2693

### Re: Power Supply for Raspberry 4 bad design for Australia

We were having a chat about this in the office just now. The particular pinout is used in a large number of countries around the world, not just Aus/NZ/China. https://www.worldstandards.eu/electricity/plugs-and-sockets/i/ and https://www.worldstandards.eu/electricity/plug-voltage-by-country/ It's q...
Fri Jul 16, 2021 11:21 am
Forum: General discussion
Topic: Power Supply for Raspberry 4 bad design for Australia
Replies: 89
Views: 2693

### Re: Power Supply for Raspberry 4 bad design for Australia

We were having a chat about this in the office just now. The particular pinout is used in a large number of countries around the world, not just Aus/NZ/China. https://www.worldstandards.eu/electricity/plugs-and-sockets/i/ and https://www.worldstandards.eu/electricity/plug-voltage-by-country/ It's q...
Fri Jul 16, 2021 1:07 am
Forum: MicroPython
Topic: Yay! Basic running under MicroPython
Replies: 16
Views: 561

### Re: Yay! Basic running under MicroPython

Code: Select all

``````import ubasic

s = '''
10 print "LOOK AROUND YOU "
20 goto 10
'''

print("=== Start")
ubasic.run(s.strip() + "\n")
print("=== Done")
``````

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