Nice clock on the fireplace 
I should have go for 6 digits instead of four!!!
I modified mine to include a DHT11 temp/relative humidity sensor that will be display for 1 sec each every 10 secs.
I also display the voltage of the SecretVoltmeter as I find that using different 5V power source, like USB power, linear regulated power supply, mobile phone charger and switching power supply, it gives a different temp reading relative of the input voltage.