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you can get help from this project with some changes https://www.engineersgarage.com/microcontroller/8051projects/interface-rfid-AT89C51-circuit
You can get help from this project https://www.engineersgarage.com/contribution/arduino-based-automatic-school-bell-system
you can use 3 Pin with different PWM signel to generate 3 phase .
Robotic arm is control of servo so you can find here how to control servo with 89c51 https://www.engineersgarage.com/microcontroller/8051projects/servo-motor-project-circuit
and for structure you can made yourself via wood or buy online .
you can get help from this project https://www.engineersgarage.com/mygarage/arduino-powered-diy-calculator
you can get help from this project https://www.engineersgarage.com/contribution/controlling-wireless-robot-matlab-gui
you can use shock gum or shock pen circuit that will be safe and it will give a littile shock
Use break; to leave the loop
you can use 7812 for 12 volt power supply upto 35v input.March 1, 2019 at 9:29 am in reply to: Problem With interfacing of GSM Module on PIC18F4550 #15033
you can get help from this project https://www.engineersgarage.com/contribution/interfacing-raspberry-pi-with-arduino
did you faced this problem before or it's your first time.February 23, 2019 at 6:31 am in reply to: Looking to add temperature control to power cord of hotplate #15026
Higher current generate the larger amount of heat. if you control the current it may control the heat on hotplate. So if you use current regulater of a variable resistence that may help to reduce the heat.