Quantity   Component name
1 × Bathroom scales without electronics just the frame
1 × Attiny85 8-pin DIP
1 × HX711 module From ebay,, £2, with metal shield.
1 × HT1621 compatible 5 digit 7 segment Lcd module From ebah, £3. .
1 × Piezo disc Bonded to frame, about 20 mm diameter.
1 × Half bridge strain gauge Bonded to the mechanical gauge. 750 Ohm per link.