LaserCutter/Technical Details
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Laser Safety System
- Using OpenLaserSafety (v1.0 at the time of writing) designed by Home of Making e.V.
- Outputs a single master signal to the laser controller
- Signaling to an i2c LED board
Checks the following sensors:
- Pressure Sensor to check if the exhaust is on and filter not congested (Honeywell HSCMRRD002NDAA5)
- Dip switch for an alternative exhaust check
- Flow & Water temp sensor (this one in 1/2")
- Lid status (separate for L/R sensor)
- Fire suppression system status (currently not in use)
- External machine unlock (currently not in use)
Sensor 'bus' cable to back
There is a big 12 wire core cable that runs from the safety board to the back of the laser, terminated on a screw terminal block.
| Color | Function | Pin on terminal block |
|---|---|---|
| brown | 5V | 1 |
| white | 3.3V | 2 |
| black | Ground | 3 |
| yellow | Pressure sensor | 4 |
| green | Exhaust flap | 5 |
| purple | Temperature sensor | 6 |
| grey | Flow sensor | 7 |
| blue | NC | 8 |
Pre 2022 maintenance wiring diagram
Out of date Laser Controller pinout (old controller)
Controller pins:
- OUT1: Output "Low" when XY start to move. OK to use this output to control air-pump On or Off as "Air-pump" take time to pump air out and slow
- OUT2: Output "Low" when laser is firing:
- Note that there is no output when XY is moving. It is ideal to use it to control an air-valve when use "Air compressor" as air-assist. Faster action
- Use the same output to trigger a timer/counter for counting laser usage.
- IN1: Door open protect (pulled to GND is closed)
- Other I/O are "NA" and reserved for future expansion
- Warning: TTL is 24V! Still, OUT1/2 are not powerful enough to drive a classical relais.
