Electronic system for a drug delivery device and drug delivery device

A drug delivery device comprising:

• an electronic system having a first state and a second state, wherein the electronic system has an increased electrical power consumption in the second state as compared to the first state;
• the electronic system comprising:
• a user interface member configured to perform a dose setting operation to set a dose of drug to be delivered by the drug delivery device and/or a dose delivery operation for delivering a set dose, the user interface member comprises a first portion and a second portion, wherein the first portion is movable relative to the second portion from a rest position of the first portion to a signaling position of the first portion;
• an electrical signaling unit configured to provide an electrical signal indicative that the user interface member is being manipulated;
• and
• an electronic control unit configured to control operation of the electronic system and to switch the electronic system from the first state into the second state in response to the electrical signal,
• wherein the electrical signaling unit is configured to provide the electrical signal in response to the movement of the first portion relative to the second portion from the rest position into the signaling position;
• and
• a reservoir with a drug.