Hello friends! Today, we will work through the EasyVR message Training Error: Recognition Failed . I originally encountered this error while training voice commands for an Arduino UNO project. Commander connected to the board, but the training attempt failed when I spoke the first command. Repeating the same attempt did not solve it. In my original setup, loading an appropriate EasyVR example and changing the shield's J12 connection from PC to SW allowed training to continue. That observation is useful, but it needs an important explanation: the correct jumper position depends on the shield revision and the communication path being used. SW is not a universal cure for every recognition error. We will separate communication problems from training and microphone problems, then return to the ...