Fog Shelves
Glass shelves in the living room — ultrasonic misters on a Raspberry-Pi-driven hysteresis RH loop (~80 %), switched via Tapo P100 plugs, BME280 + SHT35 sensors.
Not every plant needs a 1.5 m climate-controlled cabinet. Several species in the collection live on a set of open glass shelves in the living room. Each shelf has an ultrasonic mister with a reservoir, plugged into a Tapo P100 smart plug; a second Raspberry Pi polls a Bosch BME280 and an SHT35 on the shelf and toggles the plug on a hysteresis loop around ~80 % RH. No chiller, no PID, no Grafana — but not a dumb timer either.
The room handles temperature passively (18–24 °C year-round, Genoese Mediterranean climate); ambient daylight plus a plain full-spectrum LED strip provides the photoperiod.
The contrast with the highland cabinet is the point: these are the plants whose preference envelope sits inside a Genoese living room if you add water vapour and leave temperature alone. Less engineering than the cabinet, more than a wet tray on the windowsill.
What’s on the shelves
A rotating lineup. Plants that outgrow their spot or start wanting cooler nights migrate upstairs into the highland cabinet; newcomers that don’t need cloud-forest temperatures land here first and stay if they thrive.
| Shelf resident | Source | Why it’s here rather than in the cabinet |
|---|---|---|
| Vanda coerulescens | Celandroni Orchidee | Warm-intermediate vandaceous — tolerates room temperatures. |
| Neostylis Lou Sneary (N. falcata × Rhynchostylis coelestis var. coerulea) | Celandroni Orchidee | Hybrid inherits the warmer tolerance of Rhynchostylis. |
| Darwinara Charm ‘Blue Moon’ (Neofinetia × Vanda × Rhynchostylis × Ascocentrum) | Claessen Orchids & Plants | Blue-violet flowers; the blue pigmentation tracks with cooler nights specifically, which the mister-fog microclimate provides without actual chilling. |
| Mexican Pinguicula (agnata, ehlersiae, esseriana, gypsicola × moctezumae, rotundiflora, rectifolia, Marciano, Apasionada, Red Starfish etc.) | Un Angolo di Deserto · Giardino Carnivoro | Mexican pings want bright light + dry roots + high humidity during the rainy season; the fog gives them humidity without soaking. |
| Cephalotus follicularis + f. ‘Hummer’s Giant’ | Giardino Carnivoro · David Maccioni | Hates the highland night minimum (13 °C) and the still air; prefers a drier, brighter, more ventilated spot. |
| Phalaenopsis species — finleyi, lowii, gibbosa, wilsonii, parishii | Celandroni Orchidee | Warm-growing botanical Phalaenopsis, miniature in habit. Happier in intermediate conditions than in the cloud forest. |
| Angraecum didieri | Growlist | Madagascan miniature; intermediate-warm, intolerant of the highland night drop. |
| Bulbophyllum makoyanum | Gift | Southeast-Asian lowland to mid-elevation; the cabinet is too cool overnight for it. |
The hardware
- Ultrasonic mister: generic 24 V piezoelectric disc with a refillable reservoir, switched by a Tapo P100 smart plug. Replace the disc every ~18 months; cartridges are cheap and the unit itself is cheaper.
- Sensors: a Bosch BME280 and an SHT35 colocated on the shelf. Two sensors for redundancy and a sanity cross-check — RH sensors drift, and getting the setpoint wrong by 10 % is the difference between “happy plants” and “mould”.
- Controller: a second Raspberry Pi (not the highland one) runs a small Python loop — reads the two sensors, averages, and toggles the Tapo plug via the PyP100 library to hold RH around 80 % on hysteresis. No InfluxDB, no dashboard, no Node-RED; a setpoint, a dead-band, and a log file.
- Light: a plain full-spectrum LED strip along the top of each shelf, on a wall socket with a dumb daily timer (no dawn ramps, no PID, no Node-RED).
- Everything else: room air, room temperature, windowsill light where applicable.
The whole setup costs a fraction of the highland cabinet. That’s also the mental model: the cabinet is where you invest full-stack engineering when the species demands it; the fog shelves are where you invest just enough when the species lets you.
Why this counts as an “invention”
Strictly, it doesn’t. It’s a reminder: the impressive-looking solution is the wrong default. Most of the plants that end up in the highland cabinet don’t actually need the highland cabinet. The shelves document the ones that don’t.