Depending on your tolerance for accuracy, rubidium standards are much cheaper and smaller. Obviously the second is defined in terms of cesium, so if you really want to be the reference clock for your entire country, you're going to need to shell out the cash for a cesium standard. But if you merely want to be within a nanosecond per day, rubidium is fine for that.
Originally I was just using it to display the IP addresses after reboot on a smaller 0.96" 80x160. Then a screen shot... then zoom. I'm thinking more about some QR code with basic sysinfo.
QR for status or info on anything is the winner here...
can you array these off a single PI?
Imagine this:
An installation where there is an array of these screens - they are associated with whatever you want info on - they cycle btwn a screenshot of the item, some basic text (like IP/UPC/Barcode/QR to a fully detailed product/item page, uptime/health status...) etc...
And you can just have a PI running a bunch of these on a 42" rack, or on shelves of retail items etc....
This is a good question. You should be able to control multiple SPI devices at the same time, but that requires the CSX/CS ("Chip Select") pin to be present. The model I bought doesn't seem to have this feature, but someone found a hack [1]. I will add this info to the readme as you're really better off buying displays with CS if you're planning to control multiple tiny screens. [1] https://www.instructables.com/Adding-CS-Pin-to-13-LCD/
I went to a local electronics store and got one. I then looked on AliExpress and found them for a fraction of the price.
I mainly use ESP8266, as it’s cheaper but it’s less powerful and doesn’t have 5v output, just 3.3v (or at least the ones I have were like this).
I don’t have any real coding skill but between the Arduino IDE, ESPHome, MQTT and some mucking about, I got where I wanted to be.
The sensors are so inexpensive and there are so many (light, temperature, fire, smoke, moisture, humidity, distance, gasses, weight, open/close, current etc). It’s really impressive what is out there.
You can get those on banggood and aliexpress for incredibly cheap as well. You can look into nordic stuff as well for bluetooth related microboards to develop on.
If you're just starting out I can recommend looking at m5 which has nice little kits to get started. It's a bit pricier though. https://m5stack.com
The M5 kits caught my eye at MicroCenter a few weeks back when I was doing some holiday shopping, I couldn't tell if they were just toys or actually useful. Any pointers on them?
I used a similar screen to display the user interface for my DIY reflow oven. The raspberry Pi and Linux is overkill for this project, but it's so much easier building a GUI than on a microcontroller.
In a mini server farm like the one we're running at work you could stick one on each box and run htop or something along those lines. Cool for a sys admin to have a status display of each physical box's htop graph at a glance.
How about embedding them in a split keyboard in the middle so I don't even need to move my hand off the keyboard? E.g. I can just touch and jump to any part of the open file? Won't be very accurate due to the small size but sometimes I just need to go to a specific section and then I can scroll.
I have one in an IT little closet at home that displays a few stats. Temperatures, line speed, my public IP, a few PiHole stats, NAS storage space, etc.
Another screen shows a few values from temp and humidity sensors that some esp chips are collecting.
it actually reminds me of the Logitech G15 that I had over a decade ago (or G19 as the later model). The screen can be used to show some stats like CPU and RAM usage, or for games some kind of extra information like your health, your ammo count etc.
http://leapsecond.com/pages/atomic-bill/
> Batteries are included (they last about 45 minutes but are rechargeable)