Design & Fabrication of Automated Trolley Working on Cellular Frequency

shopping trolley is essential equipment for shopping in supermarkets or grocery stores. However, there were also shopping trolley safety issues such as sliding down from an escalator. Therefore, we have developed an automatic human and cell phone operated shopping trolley to solve the problems. The shopping trolley was equipped with sensors for easy movement in the shopping area. So that users can enjoy shopping and pay more attention on their children during shopping without the need of pushing the shopping trolley. This paper presents the technical construction of GSM based vehicle that could be operated from almost anywhere if GSM network exists. The process starts with initiating a call from the cell phone to a cell phone which is in auto received mode stacked in the vehicle. In the course of a call, if any of the keypad buttons was pressed a tone corresponding to the button pressed is heard at the other end of the transmission which is called Dual Tone Multiple Frequency (DTMF) tone.