Secure electronic device

A safe electronic device comprising:

• a single-channel input device for receiving at least one input value from a user of the safe electronic device and for generating a confirmation signal, wherein the input device comprises a plurality of switches, a first of the plurality of switches comprising read and confirm positions, and the confirmation signal being generated responsive to the first switch being set in the confirm position;
• an output device for outputting information including one of optical information or acoustic information to indicate the received at least one input value to the user;
• a storage device comprising a plurality of predetermined data items, each associated with a respective one of the at least one input value;
• first and second microcontrollers coupled to one another such that an input of the second microcontroller receives transmissions from an output of the first microcontroller;
• in which the first microcontroller couples to the input device, reads the at least one input value from the input device responsive to the first switch being in the read position, and transmits the read at least one input value to the second microcontroller;
• in which the second microcontroller couples to the output device and responsively to the at least one input value being transmitted from the first microcontroller to the second microcontroller, actuates the output device to output the information to the user;
• wherein, responsive to the first switch being set to the confirm position to confirm that the information indicated on the output device corresponds to the at least one input value, at least one of the first and second microcontrollers releases the predetermined data items associated with the at least one input value in response to the generated confirmation signal;
• and
• wherein the predetermined data items include parameter values to operate, configure, or control the safe electronic device.