Laser Electronics: Difference between revisions
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[[File:Laser_electronics.jpg|200px]] | [[File:Laser_electronics.jpg|200px]] | ||
[[File:Laser_driver.jpg|200px]] | |||
[[File:Laser_Swtch_wiring.jpg|200px]] | |||
[[File:Lasor-switches.jpg|200px]] | |||
===Laser control board pinout=== | |||
Left Header: (Top to Bottom) | |||
* GND (Shield) | |||
* SW_1 (Yellow) | |||
* SW_2 ( Green) | |||
* SW_4 (Blue) | |||
* SW_8 (Lt Purple) | |||
* Disable (Lt Brown) | |||
* ... | |||
Top Header: (left to right) | |||
* Output to LEDs | |||
* PWM output to laser tube (2 pins - black, red) | |||
Bottom Header: (Left to right) | |||
* Laser EN (Black) | |||
* ... | |||
* (I/O to parallel port here) | |||
Right Header: (Top to bottom) | |||
*... | |||
* (Power Input & output to stepper driver) | |||
=== Proposed Laser Power Control Modification === | |||
A small board will be added into the laser which muxes the digital and switches, using the inputs to the PIC where the switches used to go. | |||
[[File:Laser_power.jpg|200px]] | |||
====Removal==== | |||
* To remove the board, simply remove it - all connections are screw terminals | |||
* connect all the switch cables back into the original connectors, and pin 1 of the parallel port to the LASER_EN pin. | |||
** All relevant pinouts have been documented on this page. | |||
* Remove or cap off the unused parallel port pins (pins 8,9,16) | |||
====Impact==== | |||
* Workflow will not change. Same commands (M62/M63) are used to toggle power. | |||
* Fails-safe - If switch is in wrong mode, will cut at lowest power setting. | |||
====Usage==== | |||
The HAL file driving the laser will be modified to take spindle speed (default = 1), converting to binary, setting 4 LSB gated with the same M62/M63 P0 commands to power on/off laser. To use this, the following would be done: | |||
* Mode switch set to "Auto" mode | |||
* M3 S''N'' where ''N'' is an integer from 1 through 15, to indicate laser power level desired. | |||
====Future changes==== | |||
* need to increase laser PWM and switch polling rate. This will allow for in-line rastering of 4-bit images, which would be awesome. (Modifications not yet fully scoped.) | |||
====Schematics==== | |||
[[File:Laser_power_mod.pdf]] | |||
==== Laser Power controller board pinout ==== | |||
Long header: | |||
* yellow = switch input | |||
* blue = parallel input | |||
* green = output to PIC (where switches used to go) | |||
Top header: | |||
* Pin 1 (Orange wire) LASER_EN | |||
* Pin 3,4 - (Purple) Mode Switch | |||
* Pin 5 - Ground | |||
* Pin 6 - 5V | |||
=== Code === | === Code === | ||