I am thinking about building some more sensors for my high speed photography unit. there going to be some requirements that I haven't quite figured out as yet to do with using multiple sensor and alike.
The first task was to get an idea about what I need, and the best way to go about it. the idea at the moment stands at using a 14m2 to handle any of the future comms (maybe single wire serial, to controller and the same again to other sensors) that I am going to need and to produce a 38khz pwm to control the a laser (yes I know lasers are dangerous). from there I thought about a narrow pass filter would do the job, however using the attached PDF I found that things got tricky quickly with resistor sizes. As a result I am now left wondering if LED020 will be able to handle a few milliwatt (1-3mW would be enough) laser as it already has the appropriate filter built in? Will it handle having the laser on continuously?
The laser will need to be able to be switched off when the system fires. normally I would think that running the PWM through the base of a transistor would be enough, should I use 2 transistor, the first producing the PWM, and the a second being an "on/off" switch? or something else altogether?
any suggestion about transistors and lasers are welcome, I only BC548 Transistors here at the moment so will need to order more. most basic lasers out there seem to be around the 40mA mark so the picaxe wont be able to supply the juice it needs.
this is primarily going to be for capturing insect to flower or some sort of "bait" so will need to function during the day and a normal wide angle IR beam most likely wont work.
The first task was to get an idea about what I need, and the best way to go about it. the idea at the moment stands at using a 14m2 to handle any of the future comms (maybe single wire serial, to controller and the same again to other sensors) that I am going to need and to produce a 38khz pwm to control the a laser (yes I know lasers are dangerous). from there I thought about a narrow pass filter would do the job, however using the attached PDF I found that things got tricky quickly with resistor sizes. As a result I am now left wondering if LED020 will be able to handle a few milliwatt (1-3mW would be enough) laser as it already has the appropriate filter built in? Will it handle having the laser on continuously?
The laser will need to be able to be switched off when the system fires. normally I would think that running the PWM through the base of a transistor would be enough, should I use 2 transistor, the first producing the PWM, and the a second being an "on/off" switch? or something else altogether?
any suggestion about transistors and lasers are welcome, I only BC548 Transistors here at the moment so will need to order more. most basic lasers out there seem to be around the 40mA mark so the picaxe wont be able to supply the juice it needs.
this is primarily going to be for capturing insect to flower or some sort of "bait" so will need to function during the day and a normal wide angle IR beam most likely wont work.
Attachments
-
326.4 KB Views: 33