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ESP-01 WiFi module (with ESP8266 IC) A small WiFi module with an ESP8266 IC and onboard antenna. Communication is via an 8-pin (4x2) header. See the article "A WiFi Server for $5" in the December 2014 issue. Please note: if you order this item, you may receive an upgraded ESP-01S which has more flash (1MB vs 512KB). Cat No SC3982. Price: AUD $5.00 1  Add to trolley In stock: yes (42 available). Estimated dispatch time: 1-3 days Related to: Project: A WiFi Server For $5 (December 2014 [print issue] [online issue]) Project: The Clayton’s “GPS” time signal generator (April 2018 [print issue] [online issue]) Feature: El Cheapo Modules 15: ESP8266-based WiFi module (April 2018 [print issue] [online issue]) Other items relevant to these projects: El Cheapo Modules 15: ESP8266-based WiFi module: Software for El Cheapo Modules: ESP-01 (Free) Add to trolley The Clayton’s “GPS” time signal generator: CP2102-based USB/TTL serial converter with 5-pin header and 30cm jumper cable ($5.00) Add to trolley Arduino Sketch (.ino) file for the Clayton's GPS Time Signal Generator (Free) Add to trolley A WiFi Server For $5: Micromite BASIC source code for the $5 Wireless Webserver (Free) Add to trolley