Solar Dryer IoT PCB
Design an IoT PCB for a solar dryer monitoring system using one ESP32-WROOM-32 as the main controller. The system must measure temperature and relative humidity at 8 different locations using 8 sensors. Each sensor must be connected through an individual 4-wire cable: VCC, GND, SDA and SCL. Include a 4-inch TFT display, RTC module, Wi-Fi communication, 12 V DC input, 5 V and 3.3 V regulated power supplies, protection circuits, and a permanent 12 V DC PC cooling fan output. The PCB must be compact and suitable for an industrial enclosure. Recommend suitable temperature/humidity sensors capable of operating above 80 °C and optimize the I²C architecture for the sensor cable lengths.
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Remaining work:
- Select >80 °C RH sensors; Sensirion SHT35/SHT45 are strong candidates.
- Determine maximum cable length, required temperature range, and TFT interface.
- Design an 8-channel isolated I²C architecture—likely an I²C multiplexer plus per-cable buffering/protection.
- Add ESP32-WROOM-32, RTC, 12 V input protection, 5 V buck, 3.3 V regulator, TFT interface, and protected permanent 12 V fan output.
- Capture and verify the schematic, then complete compact industrial-enclosure PCB placement and routing.
Optimize I²C architecture
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