Jorge Pinto (Casainho) decided he wanted to lose some weight. For some additional motivation he enabled himself to track his progress over time online using an Android phone, a cheap bathroom scale (20€) and by adding Bluetooth connectivity to the scale.
The project is created using ($75 Estimate):
- Digital bathroom scale: $20
- ARM LPC2103 microcontroller board: $15.6
- Bluetooth serial module: $6.6
- 16x2 LCD: $15
- batteries and support: $5
- Various items like wires, etc: $12.5
The complete project write-up and history can be found here.