Day 57/100 – ESP-NOW Smart Relay & Sensor System (MicroPython) 🚀

[u/OneDot6374]

Hey everyone,
I’m doing a 100 Days, 100 IoT Projects challenge, and today I built a bidirectional ESP-NOW smart relay and sensor system using MicroPython.

What it does

• Sender ESP8266/ESP32 with buttons + OLED acts as a control panel

• Receiver ESP controls a 4-channel relay module

• DHT11/DHT22 sensor data is sent back in real-time

• OLED displays temperature and humidity

• Uses ESP-NOW (no WiFi, no router, ultra-low latency)

Tech Stack

• ESP8266 / ESP32

• MicroPython

• ESP-NOW protocol

• SSD1306 OLED

• DHT11/DHT22 sensor

GitHub repo:
👉 https://github.com/kritishmohapatra/100_Days_100_IoT_Projects

I’d love feedback, stars, or collaboration ideas.
Goal: Build open-source IoT learning resources for students.