The finished plant-stick board, with a small speaker, a volume knob, the amplifier chips and a four-battery holder above its pointed tip
Prototype

Plantas Parlantes

Hardware prototype for talking plants

A standalone prototype of the Plantas Parlantes plant-stick with its own speaker, class-D amplifier and battery power, built with Fritzing.

Commissioned by the Patching Zone we developed and produced a standalone prototype of the PlantasParlantes project. The breadboard design was converted to a more stable plant-stick object, with speaker, batteries and amplifier on board, while also keeping the product energy efficient.

Plantas Parlantes as a resulting project of V2’s Patching Zone and Recycle-X. It used the conductivity of plants as a musical instrument to make the plants “talk”. Plantas Parlantes was presented at the e-culture Fair in Dortmund, where we also were to present Fritzing.

Because the project there was in breadboard stage, exactly the phase in product development for which Fritzing offers an elegant, flexible and open source solution, it was quickly decided that it was interesting to have the Plantas Parlantes project be produced as a more stable prototype with the help of Fritzing.

The main objective of this prototype was to have the resulting board or product produce its own sound, in contrast with the Dortmund setup, where external wires and external off-the-shelf amplified speakers were used. If the Plantas Parlantes project were to make it as a standalone product or gift, it needed to have its own sound source. And thus we started testing different amplifiers, speakers, battery power sources and amplification rates.

The resulting prototype features a small class-D amplifier, together with a small speaker, which can operate on a few small AAA-batteries. We also added a switching potentiometer to control the sound level and be able to turn the device on or off.

A cluttered workbench with a breadboard circuit, loose speakers, component boxes, a multimeter and datasheets
Macro shot of a tiny surface-mount amplifier chip hand-soldered onto a green breakout board
Close-up of the knobs and switches of an old analogue oscilloscope
The oscilloscope screen showing a stepped waveform
A small oval speaker next to a larger round one, with a ruler for scale
The working breadboard version, with trimmers, a volume potentiometer, a pack of four batteries and a small speaker in a box
The breadboard in front of a laptop showing the same circuit drawn in Fritzing
The bare milled circuit board, shaped like a plant stake, with an oval cutout for the speaker
Close-up of the milled copper traces running to the surface-mount chip footprint beside the speaker cutout
The copper around the chip footprint milled away by hand, leaving a rough patch between the fine traces
Macro shot of the amplifier chip's legs soldered to the board, with a thin copper wire patched onto one pin
The amplifier chip soldered in place with its first resistor and ceramic capacitor
The board with the surface-mount amplifier and a 14-pin chip soldered on, below the speaker cutout
The amplifier chip surrounded by tall electrolytic capacitors and small blue ceramic ones
The back of the finished board, with the round speaker magnet and "PLANTAS
The finished board on a cutting mat, with four batteries in the holder and a long white wire looping off the tip