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ai thinker ESP-01S WiFi Module
Cheapest way to add WiFi to a UNO via AT commands at 9600 baud. CH_PD pin must be HIGH or it sleeps; many tutorials forget this. Hot — pulls 170 mA TX peak.
Specifications
- protocol
- wifi_2_4ghz
- interface to mcu
- uart
- voltage v
- 3v3
- range m
- 50
- power consumption ma
- 170
Sources
- SparkFun open product catalog · ingest 2026-05-06