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by TerryC65
Sun Mar 31, 2019 9:02 am
Forum: Other projects
Topic: Problem with False Detection Using wait_for_edge
Replies: 4
Views: 639

Re: Problem with False Detection Using wait_for_edge

Hi, I completed integration of this project yesterday, so I thought I ought to share how I overcame the issue highlighted in this Topic. As I suspected, noise was the problem. The main source of noise turned out to be the PWM controlling the train! When I monitored the sensor signal lines originally...
by TerryC65
Wed Mar 27, 2019 9:15 am
Forum: Other projects
Topic: Problem with False Detection Using wait_for_edge
Replies: 4
Views: 639

Re: Problem with False Detection Using wait_for_edge

Most would suggest putting a simple R-C debounce circuit for the triggers The problem is that it isn't bounce. The sensors haven't activated and when they do it's solid. The false triggers are coming from noise (I think) so I suspect that a debounce circuit, especially one using a Schmitt Trigger, ...
by TerryC65
Tue Mar 26, 2019 5:26 pm
Forum: Other projects
Topic: Problem with False Detection Using wait_for_edge
Replies: 4
Views: 639

Problem with False Detection Using wait_for_edge

Hi, I have an ongoing project which involves controlling a model train which runs backwards and forwards over a short track. The train has to stop at four places over the track. I am using the following circuit (this is a fragment of the full diagram): Underground_Railway_Circuit(V0.6).png The IR se...
by TerryC65
Fri Mar 15, 2019 10:54 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

k-pi wrote:
Fri Mar 15, 2019 10:52 am
I use all of them with my RPi3B, Rpi3B+, & RPi3A+.

I also use them with my Desktop Intel SOC computer, & the base of a netbook, which I boot from an SDHC card. ;)
Thanks. I feel a Birthday coming on :D
by TerryC65
Fri Mar 15, 2019 9:51 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Not sure if this will help you, but I admin a Minecraft SMP server using SSH, and I run the server software with the screen command. .... I can then SSH in later and enter screen -r minecraft to see current and recent output from the sever. Control+A followed by D detaches the screen session and I ...
by TerryC65
Fri Mar 15, 2019 9:41 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

k-pi wrote:
Thu Mar 14, 2019 7:36 pm
I use Eyoyo small monitors, (built in speakers), with my computers, they have HDMI & VGA connections, & I use both, depending on machine I attach them to.
Just to clarify; do you use these with a Raspberry Pi? If so, which model?
by TerryC65
Thu Mar 14, 2019 5:33 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Minicom however, works well. The second part of the problem was because I just need to do things properly! Yes I have to log in to the Pi at the end of the boot process, but then I can see the messages from our running program. I can even start minicom when the Pi has been running for some time and...
by TerryC65
Thu Mar 14, 2019 2:33 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

There's an auto-login terminal session available via raspi-config. What I don't know is if that's only available on the hardware console, or could be replicated over serial. I did look to see if I could do that, but never found anything. For me, it doesn't matter. As long as I can view the boot mes...
by TerryC65
Thu Mar 14, 2019 1:44 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

The good news is that I can communicate with the Pi and login via the communications package. The bad news is that isn't what I was trying to do :( I'm trying to view the boot-up messages and the messages that our software writes to the console as it executes. I can see much of this by logging in o...
by TerryC65
Sun Mar 10, 2019 9:02 pm
Forum: Troubleshooting
Topic: Cannot open nano in boot shell
Replies: 10
Views: 1514

Re: Cannot open nano in boot shell

I initially did it as a shell command, eg:

Code: Select all

TERM='vt220'
but that isn't persistent.

Eventually, I added that command to .bashrc, but that clearly isn't the only way.
by TerryC65
Sun Mar 10, 2019 5:42 pm
Forum: Troubleshooting
Topic: Cannot open nano in boot shell
Replies: 10
Views: 1514

Re: Cannot open nano in boot shell

My local Linux user group answered this.

I set the TERM variable to 'vt220' in env.

I don't know why it's suddenly stopped working though.
by TerryC65
Sun Mar 10, 2019 3:38 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

I was looking for something bigger than that and also, I'd like to get a response from someone who has used the recommended device. (I'm not saying that you haven't used the device you linked to, but you didn't say that you had.) To re-iterate the words from my opening post; 'Therefore, to make life...
by TerryC65
Sun Mar 10, 2019 1:33 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

I've been busy for a few days, so have only just got round to setting this up. The good news is that I can communicate with the Pi and login via the communications package. The bad news is that isn't what I was trying to do :( I'm trying to view the boot-up messages and the messages that our softwar...
by TerryC65
Sun Mar 10, 2019 1:27 pm
Forum: Troubleshooting
Topic: Cannot open nano in boot shell
Replies: 10
Views: 1514

Re: Cannot open nano in boot shell

This is just a standard login with a monitor and keyboard. (I have set the Pi to boot into a shell.)
by TerryC65
Sun Mar 10, 2019 12:20 pm
Forum: Troubleshooting
Topic: Cannot open nano in boot shell
Replies: 10
Views: 1514

Cannot open nano in boot shell

Earlier this week I downloaded and installed the latest Raspbian image from the Downloads page (2018-11-13-raspbian-stretch-full.img) and installed it onto an SD Card for use in a new project. The target device is a Pi Zero but I used my Pi 3 to perform all the updates before plugging the card into ...
by TerryC65
Fri Mar 08, 2019 2:21 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Yes, in that example shot I was using the USB-TTL adapter to power the Pi Zero. Note that there is nothing connected to the Pi0 power port. You don't need the 5V pin for serial I/O. The CP2102 outputs 3.3V TTL. Thanks. I completely misunderstood how the device works. Now, AIUI, the USB adaptor gets...
by TerryC65
Sat Mar 02, 2019 11:55 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Make a RS485 network instead of 232? Not full duplex but that might not matter if you have the right protocol. You will get faster data speeds and it only needs a 8pin dip chip as an interface. What is the fastest UART speed anyway? I don't need fast, the Unix terminal was never fast and I just wan...
by TerryC65
Fri Mar 01, 2019 9:59 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Yes, in that example shot I was using the USB-TTL adapter to power the Pi Zero. Note that there is nothing connected to the Pi0 power port. You don't need the 5V pin for serial I/O. The CP2102 outputs 3.3V TTL. Thanks. I completely misunderstood how the device works. Now, AIUI, the USB adaptor gets...
by TerryC65
Thu Feb 28, 2019 5:39 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

scruss wrote:
Thu Feb 28, 2019 5:33 pm
from my link:
VNC Server can remote the screen of Raspberry Pi apps that use a directly rendered overlay, such as Minecraft, the text console, the Pi camera module, and more
(emphasis mine)
So yes, the console.
I missed that. I'll have to give it a go.
by TerryC65
Thu Feb 28, 2019 4:07 pm
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

I doubt you'd see the console boot messages — certainly not the very first ones — but VNC Connect (free with Raspbian) has direct capture mode that can redirect the framebuffer to a VNC client. Unless I've completely misunderstood, that redirects the desktop, not the console. We have to run our sof...
by TerryC65
Thu Feb 28, 2019 11:52 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

Use a wireless Pi as a webpage server. Put the address up and visitors can log on with their phones? We actually have a TP-Link WiFi Outdoor AP which is serving up a Kiddies Quiz and Audio Guides through a Pi 3 at the moment. One plan is to link into this to provide the interface for the River Syst...
by TerryC65
Thu Feb 28, 2019 11:40 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

The specific pins you need are: Pin #8 (GPIO 14 TXD) Pin #10 (GPIO 15 RXD) Any ground pin. Hmmm. Your picture also shows a connection to 5 V? Also, I've stumbled across this https://www.raspberrypi.org/forums/viewtopic.php?p=526976#p526976 , which suggests that I need (and should use) 3.3 V, (which...
by TerryC65
Thu Feb 28, 2019 11:27 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

15 Pi's, sounds like you are becoming a network administrator. Not really, but I have been a Linux user at home and (to a lesser extent at work) for around 20 years. My home router hosts a heterogeneous network of Windows, Linux, Android and entertainment devices, so I'm used to keeping an eye on a...
by TerryC65
Thu Feb 28, 2019 8:39 am
Forum: Graphics, sound and multimedia
Topic: I'm looking for a reasonable miniature HDMI monitor
Replies: 43
Views: 3995

Re: I'm looking for a reasonable miniature HDMI monitor

You could do that with a serial console cable. From a serial terminal on another computer you can see the console output, including boot messages, and even login without a network connection. I use cheap CP2102 USB-TTL (3.3V) adapters I get from eBay for less than $2. I couldn't do that since many ...

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