3.2 ELECTRONIC DESIGN:
• The enhanced mechanical design for the automatic wall plastering machine consists of two
microcontrollers (AtMega16) :
• Plastering controller.
• Cement controller.
• Both are connected with RS232 interface and communicate the commands to control each
other and to start/stop the plastering.
• The functions of both the microcontrollers is given below:
• The plastering controller
• Controls horizontal and vertical movement of stepper motor.
• Command the cement controller to start/stop the cement pumping.
• Senses the cement discharge via sensor signal.
• The cement controller
• Controls the cement pumping.
• Senses the cement flow into and out of the pump.
• Command the cement controller to start/stop the plastering.
• There will be three sensors to control the cement flow.
• Two sensors are monitored by the cement controller and one sensor is monitored by
plastering controller.
• The various stages in communicating/controlling of microcontrollers is shown in the
proposed block diagram of electronic design of plastering machine.