| ESP32-C3 (e.g. SuperMini) | ESP8266 (e.g. NodeMCU, D1 mini) | |
|---|---|---|
| CPU | Single-core 32-bit RISC-V, up to 160 MHz | Single-core Tensilica L106, 80/160 MHz |
| SRAM | 400 KB | About 80 KB available for user data |
| Wireless | Wi-Fi 4 (2.4 GHz) + Bluetooth LE 5 | Wi-Fi 4 (2.4 GHz) only |
| ADC | 12-bit; use ADC1 on GPIO 0–4 | One 10-bit input (0–1 V at the chip; boards add a divider) |
| USB | Native USB Serial/JTAG — no USB chip or driver | CH340 or CP2102 on the board |
| Hardware security | Secure boot, flash encryption | None |
| Arduino core | esp32 core 3.x, actively developed | esp8266 core, slow-moving (3.1.x) |
| Typical board price | ₹200–350 | ₹200–300 |
The ESP8266 made cheap Wi-Fi projects possible, and boxes of NodeMCU and D1 mini boards are still in every Indian maker’s drawer. The ESP32-C3 is Espressif’s low-cost replacement: the same price class, a modern RISC-V core, five times the RAM, and Bluetooth LE. Specs are from Espressif’s datasheets; prices are indicative.
Why the C3 is the better buy today
- RAM. About 80 KB of usable RAM on the ESP8266 is the root of most “random crash” stories once you add TLS (HTTPS), JSON and a web page together. 400 KB on the C3 removes most of that pressure.
- Bluetooth LE. Phone setup over BLE, beacons, BLE sensors — the ESP8266 can’t.
- A real ADC. One 10-bit input on the ESP8266 versus several 12-bit inputs on the C3.
- Native USB. No CH340 driver hunt; the C3 SuperMini plugs straight in.
- Long-term support. New Espressif features land in the ESP32 core; the ESP8266 core mostly gets fixes.
When to stay on the ESP8266
- The project already works and you only need another copy.
- You need a D1 mini–sized board with a shield ecosystem you already own.
- You’re following a tutorial that’s ESP8266-only and don’t want to port it yet.
Porting a NodeMCU project to a C3
#include <ESP8266WiFi.h>→#include <WiFi.h>;ESP8266WebServer→WebServer. Most other calls are identical.- Pin names change. NodeMCU’s D1/D2 labels mean nothing on a C3. Use GPIO numbers from the C3 SuperMini pinout.
- Avoid the C3’s strapping pins (GPIO 2, 8, 9). GPIO 8 also carries the blue LED on most SuperMinis.
- Turn on “USB CDC On Boot” in Tools, or
Serial.print()output disappears. - analogRead() now returns 0–4095, not 0–1023 — rescale thresholds.
Watch out for SuperMini Wi-Fi
Many C3 SuperMini batches have a poorly matched antenna and weak Wi-Fi. If yours drops out, try WiFi.setTxPower(WIFI_POWER_8_5dBm), keep the antenna end away from metal, or pay more for a board with a proper antenna — see XIAO ESP32C3 vs C3 SuperMini.
Verdict
For any new project, buy the ESP32-C3. Keep your ESP8266 boards for simple jobs they already do well — a relay switch or a DHT22 logger. If you need more pins or two cores, step up to the classic ESP32 instead: ESP32 vs ESP8266.