Help with an triggered external lightsource circuit

Marksalderson

Jun 4, 2015
1
Joined
Jun 4, 2015
Messages
1
Hi All,

I work in digital imaging and my bosses have tasked me to build an external switching lightsource for a system designed to grow and image plant roots. The plant is enclosed and uses the external lightsource as a day/night cycle. At stages throughout it's development snapshots are taken using lasers. At those specific times, the PC issues a trigger signal in order to activate a normally open shutter to block the external lightsource so that only the light emitted by the internal laser will be received. The working diagram I have is:

upload_2015-6-4_15-21-5.png

The motor is actually going to be a 24v rotary solenoid running at 12v to prevent overheating. It's rated at 160mA and has a nominal resistance of 151ohms.

The transistor is going to be a BDW42G (specs here)

Would anyone be able to help me with obtaining the values of the two resistors, and also a suitable diode?


Thanks in advance.
 

Arouse1973

Adam
Dec 18, 2013
5,178
Joined
Dec 18, 2013
Messages
5,178
Diode can be 1N4001 and base resistor 1K (1/4 W) and pull down 10K (1/4 W). Your transistor is a bit over kill BTW.
Thanks
Adam
 
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