Quantity   Component name
1 × Launchpad 430 with MSP430G2553 The brains of the sensor
1 × TEMT6000 Photosensor A breakout found on eBay with a pullup resistor. Any phototransistor will do probably.
1 × USB power supply A power supply to power the launchpad. After reducing the power, a set of rechargable batteries will be used
1 × Wires and black tape Female to female dupont wires to attach sensor and 24L01+ and sensor. Black tape to stick sensor to meter.
1 × NRF24L01+ dongle A simple green wireless dongle with a loop antenna.
1 × Raspberry Pi with NRF24L01+ dongle The receiveing end.