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MPR121 I2C Address problem
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MPR121 I2C Address problem

by taknamecom on Fri Jul 23, 2021 7:08 pm

Hello forum.
I have problem with Arduino Wemos D1 R1 and MPR121 3x4 keypad.
I connect keypad to Wemos with I2C , 3V and GND Pins.
also LCD 16x2 with i2c connection is connected to board.
It get randomly i2c address , sometimes 0x5A and sometime 0x5B
I checked it on 10 mpr121 boards.
whats the problem?
thank you.

taknamecom
 
Posts: 1
Joined: Fri Jul 23, 2021 7:03 pm

Re: MPR121 I2C Address problem

by adafruit_support_carter on Mon Jul 26, 2021 1:19 pm

MPR121 3x4 keypad.

Which specific product is this? Can you link to the product page.

adafruit_support_carter
 
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Please be positive and constructive with your questions and comments.