I need a small firmware-ready solution that lets my ESP32 (with a MAX485 transceiver) poll a Selec UCI 500 PID controller over RS-485/Modbus RTU, grab the temperature once every 60 seconds, hop onto the... (Budget: ₹1500 - ₹12500 INR, Jobs: Arduino, Documentation, Electronics, Embedded Systems, Google Sheets, HTTP, Microcontroller, Software Architecture)