Solar Smart Cold-Storage Build

I have gathered every major hardware element for a solar-powered cold-storage chamber aimed at keeping perishables farm-fresh: the solar array with batteries and controller, the evaporative cooling hardware (fans, water pump, cellulose pads, piping), plus the brains of the system—temperature- and humidity-sensors tied to a microcontroller. The next step is to turn this pile of parts into a fully working, self-regulating unit. When the chamber creeps above its set temperature or drops below its target humidity, I want the microcontroller to decide—without human input—when to start the fan–pump loop and how long to run it. All decisions should be logged and shown on a small on-chamber display while also pushing concise alerts (temperature, humidity, run time, battery level) to a remote dashboard or messaging service for peace of mind when I’m in the field. Key goals • Schematics and wiring that marry the solar subsystem to the cooling and control circuits safely. • Microcontroller firmware that reads sensors, compares them to setpoints, triggers the fan and pump intelligently, and throttles operation to protect the battery bank at night or on cloudy days. • A simple menu-driven TFT or OLED screen on the door showing live readings, status icons, and last alert sent. • Remote notifications via Wi-Fi, GSM, or LoRa—whichever best fits micro-power constraints—so I receive warning pings even when off-site. Acceptance check The build will be considered complete once a 24-hour test cycle keeps the chamber within crop-safe limits (±2 °C, 70–90 % RH), logs every intervention, and displays/forwards at least one automatic alert. All source files—code, wiring diagrams (Fritzing/Eagle), BOM annotations, and a short user manual—form the final deliverable, ready for me to replicate or scale. Budget: INR 600–1500