ESP-01 ESP8266 Wi-Fi module
by AI-Thinker
SKU: PSA-CMP-ESP01
No reviews yetTypical India street price
₹80–₹180
Add Wi-Fi to UNO via AT commands, or run Lua/Arduino on the ESP itself.
Interface: UART AT commands / GPIO0-2
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Concept
A tiny Wi-Fi SoC with 8 pins. Can be a modem (AT) or the whole brain.
A little theory
3.3 V CMOS. GPIO0 LOW at reset = flash mode. 115200 8N1 typical. In the classroom, treat ESP-01 ESP8266 Wi-Fi module as a intermediate part using UART AT commands / GPIO0-2. Typical India street price is about ₹80–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
USB-TTL + 3.3 V regulator; CH_PD high; flash with esptool or use AT from UNO SoftwareSerial.
Classroom & project use
- UNO + cloud
- Wi-Fi gadget
- Communication Modules classroom demo
Buying in India
Precautions
- Never 5 V VCC
- Level-shift TX from 5 V boards
Specifications
| SoC | ESP8266 |
| Flash | 1 MB (01S) |
| Category | Communication Modules |
| Difficulty | Intermediate |
| Voltage | 3.3V only |
| Interface | UART AT commands / GPIO0-2 |
Pinout
VCC | GND | TX | RX (cross TX↔RX; common GND)
