29 lines
1.8 KiB
Markdown
29 lines
1.8 KiB
Markdown
ESP32 Wi-Fi and MQTT to LoRa UART gateway bridging Home Assistant commands to remote garden watering solenoids.
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**Status: in progress**
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### What it does
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* Connects to Wi-Fi network and subscribes to Home Assistant MQTT topics (`homeassistant/ESP32/control`)
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* Receives irrigation schedule triggers and valve pulse duration commands from Home Assistant
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* Converts incoming MQTT messages into long-range LoRa packets over Serial2 (TX GPIO 17, RX GPIO 16)
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* Controls remote battery-powered solenoid watering nodes across the garden without Wi-Fi coverage
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### Bill of Materials
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| Part | Quantity | Purpose |
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| :--- | :---: | :--- |
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| ESP32 Development Board | 1 | Microcontroller handling Wi-Fi, PubSubClient MQTT, and UART bridge |
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| RA-01 LoRa SX1278 Module | 1 | 433MHz / 915MHz UART LoRa transceiver connected to Serial2 (pins 16/17) |
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| 12V DC Solenoid Water Valve | 1 | Remote irrigation control valve operated by distant LoRa receiver node |
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| MOSFET Driver / Relay Module | 1 | High-current valve actuator driver circuit on receiver node |
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### How it works
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The central ESP32 bridge stays connected to the local MQTT broker (`192.168.20.30`). When Home Assistant publishes a watering trigger to `homeassistant/ESP32/control`, the callback function captures the payload and immediately re-transmits it via UART (`Serial2` at 9600 baud on pins 16/17) to the RA-01 LoRa transmitter, reaching valves up to hundreds of meters away.
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### What broke
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* Software serial baud rate mismatches initially corrupted LoRa packets; switching to hardware UART (`Serial2` on GPIO 16/17) eliminated buffer overruns and frame drops.
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### Links
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* Gitea Repository: [sam/LoraMqttWatering](https://gitea.lab.audasmedia.com.au/sam/LoraMqttWatering)
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