Block diagram

Weighing scale

• Load cell sensor will detect the weight of the clothes
• Amplifier will amplify the signal
• ADC will convert the signal from analog to digital
• The load is measured in kg and all the instructions is written in the MCU. Signal from the sensor will be send to HC-11. HC-11 acts as a transmitter and it will transmit the signal from weighing scale to the HC-11 receiver on the PC

PC

• HC-11 on pc acts as a receiver and it will receive the signal from the weighing scale. All the instruction is once again written in the MCU and it will be link to the PC
• After receiving all the signal, VB program will take place
• In the VB program, weight & price of the clothes will automatically calculated once the customer puts his clothes on the weighing scale
• Cashier will select the types of wash requested by the customer
• The wash selection usually different in price and in VB program calculation is made based on weight and types of wash
• Each receipt received by the customer will contain the different bar code in order to differentiate the customer’s record
• VB program will also act as database so the customer’s record will be stored in the program. If the owner of the laundry shop wants to check his customer’s record, he only need to scan the bar code at the receipt using bar code scanner and the VB program will display the record