New Vale Nodes
The previous displays I made for Vale were pretty straight forward, an arduino nano was connected to a DS3231 real time clock chip and at the appropriate time they displayed a number on an LED matrix display . The whole thing was powered from the mains with a 5V PSU. This year they wanted the same thing, but on the nodes, out in the quarry and this mean battery powered and waterproofed, there had to be some fairly significant changes to the system. Firstly, if you want a battery powered item to last for a whole weekend, LED's are a bit of a no go. They're quite power hungry and illuminating a whole display of them is going to eat through batteries. The other problem with LED's is that they can be hard to read in the sunlight and blinding in the darkness. ePaper displays however can be read in direct sunlight, can be illuminated with a torch and many only consume electricity to change the image. They seem ideal for an application like this. I opted for these w...