ESP8266 Community Forum

- Sat Jan 28, 2017 2:52 pm #61663 NodeMCU V3 (LoLin) does NOT detect (“find”) LCD (16x2) I2C Display Module

Other related observations:
NodeMCU does detect a 20X4 LCD Module (Address: 0X27)
The same 16X2 LCD Module is detected successfully when connected via an Arduino/UNO (Address: 0X3F)

LCD (16x2) I2C Display Module NOT detected (found) by “i2c_scanner”, and “I2C_Address” Programs

Setup Details:
Arduino IDE (version 1.8.2), Running on a Raspberry Pi 3
(Rpi OS: "Raspbian GNU/Linux", VERSION="8 (jessie)", Debian)

LCD (16x2) display Module to NodeMCU connections
SCL connected to D1
SDA connected to D2
VCC connected to VU
GND connected to G

Serial Monitor data:
“i2c_scanner”, and “I2C_Address” Programs
Scanning...
No I2C devices found

- Tue Jan 31, 2017 6:31 am #61809 I would like to add that
The LCD (16x2) I2C Display tested successfully - for finding the Address - when connected to a Version 0.9 of the NodeMCU Module, that I acquired today.
(So, only the 1.0 NodeMCU V3 (LoLin) Module seem to have a problem detecting this type - (16x2) I2C - of LCD Display.)