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Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
I have designed (but not yet done PCB and prototiping) my new coilgun compact pistol.
It consists in a control unit using a pic16f876a microcontroller and 4 digit led display for pulsetime , magazine counting and charge control. A switching board housing 5 scrs + 1 IGBT. A royer charger with 50W power and a power supply board with fuses and various voltage regulators and converters. The mechanism kicks projectiles out of the magazine using a solenoid in a automatic fashion. the microcontroller control all.
These are the eagle schematics , the boards are not posted. ]1180262970_14_FT0_pistola_magnetica.zip[/file]
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
Schematics, PCB masters and software (firmware) for the microcontroller completed
Current software version V.110 Operating frequency 20MHz
Features: Magazine counting Total shot couting Capacitor voltage display (ADC) Charge control with 5V hysteresys Pulse modulation for the 5 stages Password protection with 33 alfanumeric characters (4 digits)
All parameters can be modified via keyboard (3 keys)
Program cicle:
Reset-> check->display version->password (if set)-> normal mode
Normal mode: Magazine rounds*-> capacitor average voltage-> setting magazine capacity -> setting voltage setpoint (limited to max cap voltage) -> setting pulse width of stage 1 (10us-2550us)->setting pulse width of stage 2->......setting pulse width of stage 5 -> total shot count (max 9999 shots then 0000 again)->new password setting-> magazine rounds*
When an IR gate is crossed : all gates ar OR-ed on RB0/INT setting the interrupt on the rising edge
the interrupt handler determines which pin (of PORTC) is high then selects the proper pulse width and pulses the pin on PORTC that turns on the IGBT driver
If none of the PORTC pins selected as input is high or more than one, an error message is displayed and the chip resumes the activity
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Coilgun 5 stage machinepistol
