Pwm » History » Version 1

hugomeiland, 2013-02-22 19:17

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h1. PWM
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PWM stands for Pulse Width Modulation and is used to control the power of the laser. On the HPC3020 you will see a mA meter and a turn knob that will allow you to control the power of the laser by hand. With PWM the Laos board can take over this function, which allows for e.g. engraving of pictures or controlling the right power settings for certain materials. 
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h2. Enabled laser PWM
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To use the power control from the LAOS board, you need to connect the laser PWM output to the ANALOG input of your power supply. You need to make a two wire cable with a 3 pin JST on one side, and a 4 pin JST on the other side.
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* Use a 470 ohm pull-up resistor between +5V and analog in at the laser power supply side. 
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* "C" connects to the analog in pin (and resistor)
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* "E" connects to GND   
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