I appreciate the thoughts, but using an old 15" monitor with a HDMI / VGA Adaptor is not much better than what I'm using at the moment. The real problem is the weight and the unwieldiness caused by the bulk of the thing and the stiffness of the cabling.scruss wrote: ↑Wed Feb 27, 2019 5:52 pmgood, cheap and small is kind of a "pick any two". Small and HDMI tends to mean Lilliput video monitors and clones, which are not cheap. Cheap small displays tend to be composite and grotty even for command line work.
There are millions of 15 and 17" monitors at computer surplus places right now for less than their disposal cost. Many of them are DVI and VGA only, but HDMI to DVI is a cheap adapter. Bigger than you wanted, I know, but I'd be shocked if you paid £10 for one.
Thanks. I note that the UK price is is almost the same number in GPP as the US price in dollarsLTolledo wrote: ↑Wed Feb 27, 2019 10:14 pmThen I also got myself a 10" HDMI screen with built-in speaker. Definitely much better than 7".
both were bought from Amazon.
similar looking one like this
https://www.amazon.com/Loncevon-10-1-Po ... 378&sr=8-5
Thanks. The 10.1 inch version is probably outside my budget and the 7" one is at the bottom end of my size range, although at 1024x600 resolution it might still do the desktop OK. I would need a case for my requirement, which adds a bit to the price.
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.
If you can live with 5 inch, this one is pretty affordable.
I couldn't do that since many of my GPIO pins and in particular the ones shown in your image, are used to power / read sensors. However, if I can get a console through a USB adaptor on the Pi to another USB adaptor on my laptop, then I could have the answer.HawaiianPi wrote: ↑Thu Feb 28, 2019 8:27 amYou 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'd have to get it shipped, since it doesn't appear to be available in the UK. I'd also rather have something a little bigger. Thanks for the suggestion though.
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 network. However, the Model Town's system is a bit different (see below).
Not all of the logs mentioned in that link are relevant to us. The system is using a private wired network and the various Pis are all connected as clients to our 'Master Pi'. We create our own log file to record the activity in the system, including levels and the state of the various valves etc. I only wrote a small part of this software and the networking part in particular was written by another team member. There is (currently) a wireless router connected to the system to make development a bit easier, but there is no connection to the Internet.Gavinmc42 wrote: ↑Thu Feb 28, 2019 11:03 amMy Linux knowledge has mostly been single Pi based but I seem to remember something about logging to an admin Linux box.
Google found this first, jogged the memory about logs file redirection.
ttps://www.eurovps.com/blog/important-linux-lo ... onitoring/
Grab some books on Linux Administration?
All good ideas, but I'm not sure what is feasible. If anyone knows an easy way to view the main terminal of a Pi through a phone, tablet or laptop, I'd love to hear of it. (I am still thinking about how I could connect via a serial link as mentioned by HawaiianPi above.)
The specific pins you need are:
Hmmm. Your picture also shows a connection to 5 V?
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 System Visitor Display, so we can have it somewhere convenient for the Visitors, (but not needing to be near to the Cat 5 Ethernet). The intention is that the Visitors only get access to the info, the staff get access to the controls and the developers go in via the wired network.
Very interesting. I'll look into that, although I have no problem checking logs over SSH from my phone or laptop using the temporary Wireless AP connected to the wired network as mentioned above. Thanks for your suggestions.Gavinmc42 wrote: ↑Thu Feb 28, 2019 11:41 amI've recently been playing with Bluetooth LE, I think this is called Eddystone beacons.
I think even microbits can transmit the URL's via BLE.
You might be able to use the same method but with secure access to check logs?
BLE has a serial mode that works like wireless UART.
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 software in the shell because the Pi Zero hasn't got enough grunt to handle all of the workload and run an X session as well.
(emphasis mine)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
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.which suggests that I need (and should use) 3.3 V
Thanks. I completely misunderstood how the device works. Now, AIUI, the USB adaptor gets it's power from the laptop / PC and the Pi powers the data on the UART pins from its end.
I don't need fast, the Unix terminal was never fast and I just want to view the console boot messages and the output from our software.
No Zeros don't have Ethernet, but it is still cheaper to buy a Zero + a cheap USB / Ethernet Adaptor, than it is to buy a Pi 3. The Pi 3 is an excellent piece of kit, but we don't need the performance boost and the physical size would have made packaging a bit more difficult.