Naturaleza viva

As I said in the previous post I’ve wanted to build a 555 timer with transistors for a while. The 555 Contest was the perfect excuse to finally make it.  Although the circuit was designed by me it has the same basic blocks that make any 555 timer, and therefore the exact same functionality in a new (and pretty odd) package.

HM555 schematic

HM555 schematic

I really hope this is not a contest rule violation.

I don’t know where the idea came from, but an electronic singing flower seemed like a nice art project. The flower is made with two 555 timer (or one big 556 perhaps?) connected to each other, one with an astable configuration and the other as monostable (a setup known as Atari Console). Instead of potentiometers I used a LDR and a pair of cables as “roots”. That way the flower reacts to light and variation in soil moisture, pretty much like any flower.

Flower circuit

Flower circuit


It has 8 petals, 4 of them made each timer. I put some plasticine on top of a PCB board in order to have something where I could stick the transistors to while soldering them. I used it also as a template. The outline copper wire is connected to VCC.


I made half a flower first and tested;

The I built all the other petals and put everything together

There are more pictures here and below there is a short video showing the flower “singing”


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