Quantity   Component name
1 × "hack'able" OpenWRT router any router that can be modified with GPIO - hotplug (Edimax BR6104K(P))
1 × SAA1064 Interface and IO ICs / Display Interface
1 × 4 digit 7-segment LED display
1 × LED used as sensor
1 × opamp IC to amplify LED blinks inputs, e.g. KF353
1 × CD4074 T flip-flop chip
1 × CNY70 sensor for water consumption