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Another characteristic unlike the bipolar transistor is that the mosfet need a tension on the gate bigger than 10 volts, we will use 12 from power source. Because the PWM of atmega has a switching frequency about Hz we have a switching time around 2 ms.
To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image below: Because we will chop the tension from the gate of mosfet can appear a higher current, value dependent from switching time and charge of the gate. To protect the microcontroller we use a optocoupler which has a limit of switching current.
Such a project is detailed below: To chop the tension we will use a transistor. August 21, admin February 26, admin 5.
If we have a p channel mosfet the situation was reversed. The program for this project is: That current is calculated with this formula:. If you like the article click the follow button from social media to stay in touch with us! Of course you can buy it but why not to make yourself one as you like homemade and have the satisfaction that you made something by yourself.
To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image below:. At 16W power the lamp will absorb 1. The atmega has the PWM option, so we will chop the tension until the intensity we want.
The wiring diagram is below: This control is made by light and protect the atmega from eventual defect in the part of mosfet. Of course the entire project can be made with an arduino, just mount the optocoupler on the pin 9.
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This component let us 2ssk2648 control the mosfet without a direct contact between atmega and lamp. Because sometimes we want to dim the lamp, we try with an Atmega and anothers components to reduce the intensity with a potentiometer.
The 10k resistor and the transistor of optocoupler make a voltage divider, so when the transistor is polarized like a closed contact and mosfet is blocked lamp offwhen the transistor is blocked like a open contact the mosfet receive on gate 12 volts and it is polarized lamp on.
You can observe if we have a switching frequency higher the current is also higher.