Simplest UNO Digital Clock Ever

Solderless Breadboard Half Size

Jumper wires (generic)

Pushbutton switch 12mm

Arduino UNO

Standard LCD - 16x2 White on Blue

I tried the clock from here: <a href="https://www.hackster.io/Annlee_Fores/simple-arduino-digital-clock-without-rtc-7d4303">https://www.hackster.io/Annlee_Fores/simple-arduino-digital-clock-without-rtc-7d4303 </a>and found lots of problems in it, so decided to improve it.<figure><img src=https://projects.arduinocontent.cc/28964b70-df07-4d77-8c2f-e3701cfec85e.png /><figcaption> </figcaption></figure><figure><img src=https://projects.arduinocontent.cc/df026102-689c-4553-a7d2-d9d8a539c2e3.png /><figcaption> </figcaption></figure><figure><img src=https://projects.arduinocontent.cc/c6992d1a-2896-4457-aabd-7c399263e9ac.png /><figcaption> </figcaption></figure>Now the incrementation of s will be every 1 second and no more depending from the loop{} execution time.RESISTORS AND POTENTIOMETER SUCKS, I removed them completely.For the Pullup of the time setting buttons, you can use the one integrated in the ATmega328P chip...<figure><img src=https://projects.arduinocontent.cc/fc6717bc-ea9e-409b-b181-88d71b56eba7.png /><figcaption> </figcaption></figure>pinMode(hs, INPUT_PULLUP) avoids to use a external pullup.Avoid the LCD Contrast Potentiometer !The contrast of the LCD can be set with a Arduino PWM signal.Same for the Backlight, powered with the Arduino PWM signal, so it can be set on / off and intensity by the Arduino. Here is a short video about this precision clock! <div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/96VxMJOngL0" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe></figure></div>

Simplest ever UNO clock with LCD

Schematics simplest UNO clock ever

Breadboard wiring simplest UNO clock ever

Fritzing file simplest UNO clock ever

Simplest UNO Digital Clock Ever

The simplest Arduino LCD clock ever designed. Only needs an Arduino UNO, a 1602 LCD, and two buttons. No resistors, no potentiometer.