Raspberry Pi-using tinkerer David Hunt—who previously built a bark-activated door opener for dogs—is at it again with a real, working cellphone powered by the tiny computer and a few other items.
"PiPhone" cost Hunt $158 to build with these components, all held together with cable ties:
Raspberry Pi Model B – $40
PiTFT Touchscreen 320×240 – $35
2500mAh LiPo battery – $15
SIM900 GSM/GPRS module – $48
DC-DC boost converter 3.3V – 5V 1A – $10
Cables, connectors, switch, etc. – $10