Hello
I need to control a vacuum valve in the car with arduino, depending on the rpm, duty cycle is from 40% -75% (pwm), what transistor should I use and if anyone can help me with the scheme, the valve voltage is 12v
Thanks
You make no mention of the load current making it impossible to suggest a transistor. Low current a 2N3904 good to about 200 mA, the 2N2222 is nice to 800 mA and personally rather than a transistor I like the FQP30N06L or for light work a 2N7000. The latter two are MOSFETs. So how about you provide a drawing of your intended application and some real world numbers?
Ron
measured, the current is about 1.1A,
while the sensor has two terminals positive and negative
Thanks
I upload image in this link because i cant upload here
https://ibb.co/6XvgqJN
You current is flowing the wrong way!
For over an amp a logic-level MOSFET is appropriate, rated at 55V (standard automotive voltage), 0.1 ohm or less on-resistance.
You need to common the grounds between the switched circuit and the Arduino. The valve will be inductive so
a free-wheel diode is needed across it - as in circuits for switching a relay using a mosfet.
but relays do not work here, because the valve will operate with pwm signal with source voltage 12 volt
but relays do not work here, because the valve will operate with pwm signal with source voltage 12 volt
The valve will be inductive so a free-wheel diode is needed across it - as in circuits for switching a relay using a mosfet.
As in a circuit for switching a relay. Read what was posted.
You want a Logic Level MOSFET and you can PWM the low side of the valve. It's a common circuit, nothing unique or out of the ordinary.
Ron
As in a circuit for switching a relay. Read what was posted.
You want a Logic Level MOSFET and you can PWM the low side of the valve. It's a common circuit, nothing unique or out of the ordinary.
Ron
Sorry , I apologize for my mistake, thank you for your help
All the best
measured, the current is about 1.1A,
while the sensor has two terminals positive and negative
Thanks
What sensor?
Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html (http://forum.arduino.cc/index.php/topic,148850.0.html).
Thanks.. Tom... :)