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by drgeoff
Mon Jan 21, 2019 7:44 pm
Forum: Troubleshooting
Topic: Can't connect 192.168.1.1
Replies: 6
Views: 85

Re: Can't connect 192.168.1.1

DarkPlatinum wrote:
Mon Jan 21, 2019 7:38 pm
192.168.1.1 should be your routers IP address.
Not necessarily. Eg a very large percentage of home routers in the UK have an IP address of 192.168.1.254.
by drgeoff
Mon Jan 21, 2019 5:56 pm
Forum: Beginners
Topic: USB communication with Pi Zero
Replies: 2
Views: 48

Re: USB communication with Pi Zero

To amplify what thagrol has said, Zero and ZeroW have only one USB port. The micro-USB socket nearest the corner of the board is power input. The data pins of that socket do not connect to anything.
by drgeoff
Mon Jan 21, 2019 5:39 pm
Forum: Beginners
Topic: Multiple partitions on SD card that came with RPi2?
Replies: 43
Views: 552

Re: Multiple partitions on SD card that came with RPi2?

Nobody ever mentions in their tutorials to make sure your SD card reader is SDHC compatible either. Seems like an important enough detail to mention. In any case, thanks for explaining that. I don't have an external card reader for my laptop but decided to try Raspi SD Imager. Apparently that requi...
by drgeoff
Mon Jan 21, 2019 1:07 pm
Forum: Automation, sensing and robotics
Topic: 2 LED wiring
Replies: 9
Views: 96

Re: 2 LED wiring

You can use one resistor if only one LED will be on at a time. Anode of each LED to their GPIOs. Cathodes of LEDs and one end of resistor all joined together. Other end of resistor to ground.
by drgeoff
Sun Jan 20, 2019 3:32 pm
Forum: Beginners
Topic: Repetier load prolems
Replies: 2
Views: 29

Re: Repetier load prolems

What image?
by drgeoff
Sun Jan 20, 2019 12:34 pm
Forum: Other
Topic: How to skip initial network setup(ubuntu core)?
Replies: 5
Views: 100

Re: How to skip initial network setup(ubuntu core)?

santaknows wrote:
Thu Jan 17, 2019 10:03 pm
I am trying to run raspberry pi with ubuntu core and want to skip the initial network setup.
I don't use network and not going to use.

How can I skip the setup? or Can I type some dummy inputs to skip it?
or Can I type some dummy inputs to skip it?
by drgeoff
Sat Jan 19, 2019 8:01 pm
Forum: General discussion
Topic: Is NOOBS better than Stretch?
Replies: 6
Views: 129

Re: Is NOOBS better than Stretch?

NOOBS is not an OS. NOOBS is an OS installer. NOOBS can install Raspbian Stretch, exactly the same version of Stretch as installing the Stretch img version.

If you only want Stretch, NOOBS gains you nothing but loses you a not insignificant amount of space on the CS card.
by drgeoff
Sat Jan 19, 2019 4:49 pm
Forum: Troubleshooting
Topic: ribbon connections
Replies: 8
Views: 168

Re: ribbon connections

The cobbler (the T-shaped thing) replicates the RPi GPIO header. The GPIO header does have some sets of commoned pins, eg ground and power rails are on more than a single pin. So I would expect that some pins on the cobbler are commoned. See https://raspi.tv/wp-content/uploads/2014/07/Raspberry-Pi-G...
by drgeoff
Sat Jan 19, 2019 3:18 pm
Forum: General discussion
Topic: computer power supply
Replies: 24
Views: 662

Re: computer power supply

Imperf3kt wrote:
Sat Jan 19, 2019 10:15 am
You'd probably be surprised to know that most of the power supplies I've seen only supply about 3 to 5 amps on the 5v line
I would be surprised given that the weedy, more than 10 year old one that I'm looking at as I type this is labelled:
+5v 15A
+12v 3A
-12v 0.5A
+3.3v 12A
+5vSB 1.5A
by drgeoff
Sat Jan 19, 2019 12:21 pm
Forum: Beginners
Topic: Reverse Polarity and Relay Board
Replies: 3
Views: 91

Re: Reverse Polarity and Relay Board

5 volt relays are problematic with RPis which only have 3.3 volt outputs. 1. Do NOT join VCC and JD-VCC on the relay board. Doing so can damage the RPI. 2. Without external circuitry between the RPi and board or modifying the board the best chance of success (no guarantee) is to connect JD-VCC to 5 ...
by drgeoff
Sat Jan 19, 2019 11:59 am
Forum: General discussion
Topic: new to soldering - safety questions, etc.
Replies: 46
Views: 886

Re: new to soldering - safety questions, etc.

I am still using the Weller TCP-1/PU-1D that was issued to me in 1971 and was powered up for 8 hours most working days for the first 9 years. Can change the temperature by using a different tip. (Curie point.) About 5 years ago I had to replace the outer barrel which suffered metal fatigue and crack...
by drgeoff
Fri Jan 18, 2019 12:49 pm
Forum: Troubleshooting
Topic: HDMI doesn't work and says no signal
Replies: 5
Views: 132

Re: HDMI doesn't work and says no signal

Read the "not booting" sticky.
by drgeoff
Fri Jan 18, 2019 12:44 pm
Forum: Beginners
Topic: Help Making Custom Keyboard
Replies: 4
Views: 84

Re: Help Making Custom Keyboard

You can make a matrix keyboard. Using 5 by 6 will give you up to 30 Keys and will use 11 GPIOs.
by drgeoff
Fri Jan 18, 2019 10:59 am
Forum: Troubleshooting
Topic: No wifi Interface Found
Replies: 4
Views: 123

Re: No wifi Interface Found

Are you sure you have a ZeroW and not a Zero? Click on the pictures at https://www.raspberrypi.org/products/ and check against your RPi.
by drgeoff
Thu Jan 17, 2019 9:54 pm
Forum: Bare metal, Assembly language
Topic: Reset interrupt vector at 0x0
Replies: 2
Views: 171

Re: Reset interrupt vector at 0x0

DanB91 wrote:
Tue Jan 08, 2019 3:22 pm
Hi all,

I am doing some bare metal programming on my Pi 1 B+.
So why didn't you post in the bare metal section of the forum?
by drgeoff
Thu Jan 17, 2019 12:23 pm
Forum: Beginners
Topic: No accès to SD card after installation on OS X
Replies: 2
Views: 67

Re: No accès to SD card after installation on OS X

1. Ether overwrites the partition table. Formatting the card before writing an image using Etcher (or any other image writing method) is a waste of time. 2. Any card that is bootable by a RPi contains a partition with some version of FAT. OSX should be able to read and write that. Ignore any message...
by drgeoff
Wed Jan 16, 2019 10:28 pm
Forum: Troubleshooting
Topic: Raspberyy Pi 3 B+: not booting and no green light!
Replies: 7
Views: 164

Re: Raspberyy Pi 3 B+: now booting and no green light!

Do you have a typo in the post title? Should "now" be "not"?
by drgeoff
Wed Jan 16, 2019 10:23 pm
Forum: Troubleshooting
Topic: Raspberrypi won't connect to the internet.
Replies: 25
Views: 1014

Re: Raspberrypi won't connect to the internet.

I set the static IP address by editing /etc/dhcpcd.conf. I didn't know it wasn't already allocated, I just reset the router afterward to reassign all the other IPs. Pinging the router was unsuccessful. I will try pcmanbob's suggestion and provide an update when I have finished. I think routers are ...
by drgeoff
Wed Jan 16, 2019 12:06 pm
Forum: Beginners
Topic: Multiple partitions on SD card that came with RPi2?
Replies: 43
Views: 552

Re: Multiple partitions on SD card that came with RPi2?

Just use Etcher to write the image.
by drgeoff
Wed Jan 16, 2019 1:47 am
Forum: General discussion
Topic: Need help on measuring a set of batteries
Replies: 10
Views: 879

Re: Need help on measuring a set of batteries

First, why do you want to measure the voltage of the batteries, if it is to estimate the remaining capacity of the batteries, then forget about it. With modern batteries (lithium ion) this method, that could be used with nickel-cadmium, is now unusable, as the voltage of a lithium-ion battery, does...
by drgeoff
Wed Jan 16, 2019 12:05 am
Forum: General discussion
Topic: Pi, amplifier and speakers
Replies: 11
Views: 653

Re: Pi, amplifier and speakers

Imperf3kt wrote:
Tue Jan 15, 2019 10:25 pm
Where did you get 'tens of watts' from?
From the words "KEF speakers" in the opening post and "very expensive" in a subsequent one . One of the best well known names in British Hi-FI loudspeakers for years. More than 40 years since I bought mine.
by drgeoff
Tue Jan 15, 2019 11:52 pm
Forum: Beginners
Topic: No HDMI output
Replies: 7
Views: 521

Re: No HDMI output

viewtopic.php?t=231068 has lots of info about the OP's previous model and troubles. If he is still trying to use the customised card that came with his embedded model B, it would not be surprising that a recently obtained RPi does not work.
by drgeoff
Tue Jan 15, 2019 9:52 pm
Forum: General discussion
Topic: Pi, amplifier and speakers
Replies: 11
Views: 653

Re: Pi, amplifier and speakers

You cannot wirelessly convey sufficient power to make loudspeakers work. Doesn't matter if it is 433MHz, Wi-Fi, Bluetooth or any other wireless technology. Sure you can. It's just not plausible to use for audio. https://en.m.wikipedia.org/wiki/Wireless_power_transfer None of those is conveying tens...
by drgeoff
Tue Jan 15, 2019 9:08 pm
Forum: Troubleshooting
Topic: SD card works in A+ but not in B+, help!
Replies: 3
Views: 710

Re: SD card works in A+ but not in B+, help!

Another card that boots the B+.
by drgeoff
Tue Jan 15, 2019 9:06 pm
Forum: Beginners
Topic: Servo without breadboard
Replies: 16
Views: 691

Re: Servo without breadboard

You definitely need a motor driver board but you don't need a breadboard. There are other ways of making electrical connections. Jumper wires, chocolate blocks, soldering, crimping, IDC (insulation displacement connector), etc.

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