Good day to all. Thank you for reading this.
I have two i2c sensors, 20x4 lcd and UNO R3. Everytime I plug in ng the 9V barrel jack (beside USB port)in the UNO R3, the lcd won’t light up.
I tried to use, 1 i2c sensor and lcd, it works fine. However, if I attached another i2c sensor, the lcd won’t power up.
All are using 5V, GND, SDA, SCL.
Address and code are fine. Only it won’t power up. I don’t know why.
Anyone can give me an advice? THANK YOU .