32x8 LED Matrix NTP Clock with DS3231 RTC & ESP01

Breadboard (generic)

MAX7219 32x8 LED Matrix

DS3231MPMB1 Peripheral Module

Pushbutton switch 12mm

Jumper wires (generic)

Arduino IDE 2.0 (beta)

Capacitor 1000 µF

LDR, 5 Mohm

ESP8266 ESP-01

ESP-01 Adapter board

Arduino Nano R3

I wanted to learn Arduino / RTC comms for another project. Came across Ratti3 LED Matrix and thought 'let's give this one a go!'Ratti3's code failed to compile using the libraries specified on IDE 1.8.13. Consuming 32362 of 30720 bytes (105%) of program spaceNot to be deterred, time to get serious about learning Arduino!!Original idea was simply to get the code working, however over several months of learning, trial and error, managed to squeeze in a couple of additional features.The Wi-Fi ID and password of the home are regularly changed. Puling the clock down, changing ID and password in code, upload, put it all back would become very annoying. In came idea 1: to store Wi-Fi details in EEPROM and make it changeable via the menu system.EEPROM - what a good idea, how about using the EEPROM on the DS3231 module to make it portable between boards. Here in lies idea 2: detect the presence of 'external' EEPROM and use that, if none detected, use 'on-chip' EEPROM.Didn't have BH1750 or BME280, but the DS3231 has temp sensor built in, changed code to map LDR sensor reading to brightness and use the DS3231 internal temperature sensor.Is now mostly working and I think worthy of publishing in project hub, most the bugs are sorted, however still tweaking.First project posting, hopefully can come back and update this page as things progressCode is heavily commented, hopefully will help others that are also learning.

Mini_LED_Matrix_Clock_Doodles_NTP_v2

Mini_LED_Matrix_Clock_ESP8266

Breadbaord layout

32x8 LED Matrix NTP Clock with DS3231 RTC & ESP01

Yet another LED Matrix clock!