WWVB radio clock parts list
Arduino Uno
Receiver module https://universal-solder.ca/product/wwvb-msf-jjy60-atomic-clock-receiver-module-60khz/
http://canaduino.ca/downloads/60khz.pdf
Receiver IC http://canaduino.ca/downloads/MAS6180C.pdf
#define RADIO_POWERDOWN_PIN 6 // P1
#define RADIO_OUT_PIN 7 // T
Sparkfun DeadOn Real Ttime Clock https://www.robotshop.com/ca/en/sfe-deadon-real-time-clock.html
https://learn.sparkfun.com/tutorials/deadon-rtc-breakout-hookup-guide
#define RTC_SELECT_PIN 10
#define RTC_INTERRUPT_PIN 2
// GND - GND
// VCC - 5V
// SQW - D2
// CLK - D13 ** conflicts with LED_BUILTIN!
// MISO - D12
// MOSI - D11
// SS - D10
8 x 7 segment LED display module (DFR0090) https://www.robotshop.com/ca/en/dfrobot-8-character-7-segment-spi-led-module.html
https://www.dfrobot.com/wiki/index.php/3-Wire_LED_Module_(SKU:DFR0090)
#define LED_LATCH_PIN 8
#define LED_CLOCK_PIN 3
#define LED_DATA_PIN 9