Thursday, July 2, 2015

Pythagoras clock part VII (Almost Ready)

Sometimes I simply cannot sleep, this is not frequent but when it happens I need to be active. I can not stay in bed counting sheep ... When this happens I go to my garage and start working in something, I spent several nights of this week till late and the rewarding:

My Pythagoras clock is almost ready and working beautiful:



I still need some wood and electrical work:

  • Design and mill a new stop lever to hide an extra weight I added, now is a piece of rod glued to the lever
  • Finish retouch in some places
  • Make the final circuit and hide it inside the clock base

Now I am adjusting the Arduino program to obtain the precision.

Here is a short video of the clock and some function details:

This video was taken at night with no noise and the only sound was the tick tock of the clock.


  1. Excellent Carlos. You are almost there!! It is beautiful!
    What about that humming noise between the clicks? It is because the mike is too close to the motor?

  2. Thanks Oscar! The microphone was near the clock but this is almost the best I can do without a complicated electronics, The hum is produced by the Pulse Width Modulation to control the speed of the solenoid. I set the base frequency to the highest I can but the sub-harmonics are still in the audible range. To fully eliminate the hum I need an RC filter, an operational amplifier and a 1 ampere power amplifier. this is a lot of electronics for that small clock.


Please be aware that any comment with commercial links will be immediately deleted and declared as SPAM.

If you want to advertise in my blog please contact me to agree in a fee and i will be happy to add your link in the side bar.