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54 lines
2.6 KiB
Plaintext
54 lines
2.6 KiB
Plaintext
---
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title: "Balkon Pi"
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section: "smarthome"
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tags: "smarthome"
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parent: "/smarthome/"
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description: "Balcony sensor, lighting, and audio automation running on a Raspberry Pi Zero W."
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layout: base.njk
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---
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<h1>Balkon Pi</h1>
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<div class="detail-content">
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<p>A Raspberry Pi Zero W mounted near the balcony acts as a small,
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self-contained smart-balcony controller: light control, an internet
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radio player, sensor readings, and its own backup/monitoring, all on
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very modest hardware. The goal is to make the balcony a more pleasant
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space — light control when it gets dark, background music while sitting
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outside, and temperature readings to know what to expect before stepping
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out.</p>
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<h2>What it does</h2>
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<ul>
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<li><strong>Audio output</strong> via a DIY PWM-to-analog circuit on two GPIO pins — the Pi Zero has no built-in audio jack, so this is a well-known community workaround using a small RC filter.</li>
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<li><strong>Physical controls</strong>: a push button for the balcony light and a toggle switch for music playback, read directly via GPIO.</li>
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<li><strong>HTTP communication</strong> with an ESP32-based balcony light controller.</li>
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<li><strong>Internet radio</strong> via a lightweight command-line audio player, controlled by a small custom tool ported from an earlier bathroom-Pi project.</li>
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</ul>
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<h2>Hardware details</h2>
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<p>The Pi Zero W is connected to an ESP32 microcontroller that handles
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the actual light switching via a relay module. Communication happens
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over HTTP — the Pi sends a simple request to toggle the relay, and the
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ESP32 responds with the current light state. The ESP32 also reads a
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DHT22 temperature and humidity sensor, publishing the values to MQTT
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for the home dashboard. This split makes sense: the Pi handles the
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user-facing logic (audio, buttons, internet radio), while the ESP32
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handles the real-time hardware control.</p>
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<h2>Monitoring & backup, even on tiny hardware</h2>
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<p>Despite the very limited RAM, this Pi still participates in the same
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Prometheus monitoring pattern as the rest of the fleet — with the metrics
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collector's default configuration trimmed down to only the essential
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collectors, since the full default set noticeably overloaded the CPU on
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this specific board. It also runs a nightly rsync backup of its own
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configuration to the NAS over the internal network.</p>
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<h2>Planned next steps</h2>
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<ul>
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<li>Adding a USB webcam stream, mirroring the pattern already used for the 3D printer.</li>
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<li>Migrating onto the planned isolated IoT network segment once that's fully set up.</li>
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<li>Adding weather data from the DHT22 sensor to the LED matrix displays around the flat.</li>
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</ul>
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</div>
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