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The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack.

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My ESP8266-01 recognises the sensor TSL2561, but the readings always output 65535 for some weird reason. But as I said, when I run the I2C scanner and plug in the wire I see the sensor popping up at … 0x39. When I hook up the same sensor to an ESP8266 NodeMCU breakout and flash the same code on there it reads it out just fine. I have the wires connected as shown below without any resistors or …
asked Jan 28 by wouterds
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Found the bug after thinking a bit about what @DoxyLover mentioned! Those 2 lines of leftover code shouldn't be here. Apparently the default LED on the ESP-01 is GPIO2 (which is one of the I2C pins I' …
answered Jan 30 by wouterds