Ammeter based Clock

This is totally a different project and a very cool idea to implement. The project is about using ammeter to display the time by changing the amount of current entering through it. Moreover, this one also doesn’t require modification to the ammeter unlike the other projects which normally involve replacing the face plate of the meter. The project utilizes a 0-100mA meter which are easily available on the internet at a very cheap price. In addition to the meter, it utilizes an Arduino Pro mini and Ohm’s law to vary the current. The Arduino generates a PWM to vary the viable voltage over a resistor which is connected to the meter. The current generated, in principle with the Ohm’s law, would be scaled in such a path as to move the needle on the meter to the comparing hour, moment, or second. For the second and minute meters a NPN transistor was used in switching mode to deliver more current. A high precision RTC named ChronoDot has been used to keep track of the time and is easily available online.… Continue reading