Doseringsutrustningen SafeBond Electronic
This thesis for the Master of Science degree was performed at Oppunda Electronics AB. The assignment was to further develop an existing prototype of a dispensing equipment. The dispensing equipment doses a kind of glue, bonding which dentist use to mend teeth. The dispensing equipment is adjusted to dose 12 micro litres of bonding. With the dispensing equipment SafeBond Electronic the user can reduce the bonding consumption with approximately 50 percent. Furthermore will the handling of the bonding be more hygienic, because the photoelectric sensor allows the user to start a dosage without touching any part of the dispensing equipment. The main requirements for the development was to reduce the size of the existing prototype and implement functions to makeit possible to change the dose time and display the current dose time. Some parts and components have been replaced and reorganized to reduce the size of the dispenser. The choice of a steep motor, which makes the rotation when a dosage is performed, is the largest contribution to shrink the size of the equipment. Also the new designed circuit board makes it possible to reduce the size of the dispensing equipment.A LCD is used to show the current dose time. The LCD is a part of a LCD module. To change the dosing time two push buttons are being used. A microcontroller is controlling the steep motor. The microcontroller is a PIC16F877A from Microchip. The microcontroller in the dispensing equipment is controlling all the functions. The program code is designed to function in an interrupt routine. This makes it possible to set the processor in a sleep mode when the dispenser is not in use and decrease the power consumption. More functions have been implemented in the dispenser and it is now more suitable for itsassignment. In the mean time it has been possible to reduce the size of the equipment. The chosen parts andcomponents make a good price function ratio. During the product development a lot of documentations have been done. Which make the dispensing equipment ready to be implemented in production.