The UNO will probably work on 5V signals levels, is the shield 5V tolerant?
output of I2C scanner is strange.... is the baudrate ok? the source is 19200, your window says 9600 ....
The UNO will probably work on 5V signals levels, is the shield 5V tolerant?
output of I2C scanner is strange.... is the baudrate ok? the source is 19200, your window says 9600 ....