Looking for a digital recreation of the classic analog volume unit (VU) meter? If you’ve got an Arduino, a few passive components, and a SSD1306 OLED, then [mircemk] might have the answer for… ...

The ESP02 based system has been quite reliable. Now I need to finish hooking up moisture sensors. I'm moving to a JSON protocol - a friend is doing a web interface for the system. So I've been ...

This allows the meter to be easily driven by an Arduino with little more than a transistor on a GPIO pin. To detect moisture, a Iduino ME110 moisture probe was used.