- Joined May 26, 2022
Some effort to program a a small dimple uC (micro-controller) and that is your Black Box. There are also other ways to do it. It all starts with a pencil (large eraser preferred) and a blank sheet of paper and defining exactly what your project is and numbers.Personally I would use a microcontroller to monitor the photoresistor which then activates and adjusts the duty cycle of a PWM signal to change the motor speed.
You have to add a microcontroller/arduino with proper coding and a motor driver IC to the above setup.
Given the picture in post #1, the motor is a fairly small hobby type DC brushed motor, probably operating on about 3 volts, or one lithium cell. My suggestion will require a higher supply voltage because of the resistance of the light sensor.My bad. Sorry about that. Plenty of ways to control a small DC motor. Depends on what you want and the motor type.
Post #7 shows a circuit and calls out a 2N3904 pretty common NPN transistor with a max collector current of 200 mA. While the link points to a 9 volt supply which only needs be enough to turn the motor. It's a pretty common hobby circuit and the current is handled by the transistor. Pretty much as I described. Also in the linked video the motor runs or doesn't. The LDR and 10K form a basic voltage divider to bias the 2N3904 base using a 1K base resistor. Crude and simple. Would I suggest it? No, but I still haven't a clue what the thread starter has in mind.Given the picture in post #1, the motor is a fairly small hobby type DC brushed motor, probably operating on about 3 volts, or one lithium cell. My suggestion will require a higher supply voltage because of the resistance of the light sensor.
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