I had the "idea" for the pxlDigit_24 after I had built the "pxlDigit". This is a seven-segment digit that can be built using a 3D printed frame and 14 WS2812 LEDs.
At the time, I was bothered by the fact that you can (of course) only show numbers on these seven-segment displays.
What bothered me about it: An ESP8266 or ESP32 is also built into the display, which, thanks to WiFi and Internet, could display all kinds of data. Somehow I found that it should be possible to display more data without losing the retro charm of these old display types.
While looking for a solution to this problem, I stumbled across old 24 segment displays.
With the help of 24 segments per digit, these can represent not only numbers but also letters. So perfect to solve my "problem". :)
Each digit consists of a PCB and a 3D printed diffuser. This unit is then built into one of the possible housings and can thus be combined with other digits. Theoretically, displays with a large number of digits can be built in this way.
The following components can be installed on the PCB:
- ESP32 Wrover-B
- DS3232M RTC
- USB-C connector including programming option
- BME280 climate sensor
- Micro SD card slot
- TSL2591 brightness sensor
- MPR121 touch sensor for up to 12 touch electrodes
- MAX98357 3W I2S DAC (able to play mp3 files via stream or inserted micro SD card)
Of course, the PCB doesn't have to be populated with all of these components. If desired, only the 24 WS2812 LEDs can be soldered. Then these individual digits are simply daisy chained. One ESP32 is enough to control all digits.
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