How to control a 12V DC motor on a Raspberry Pi?

How to control a 12V DC motor on a Raspberry Pi?

I wish to control a 12V dc motor through the GPIO pins of a Raspberry Pi. I am currently referring to this tutorial. I have a 2N222 NPN-transistor which will used as a Switch, a 12V-2A power supply, a resistor of 1K ohms and a diode. This is the circuit I am using: ground GPIO pin to ground.

How does a solenoid work on a Raspberry Pi?

The idea is when the Pi’s output is applied to the base of the transistor, the switch opens and the circuit completes, actuating the solenoid. When the Pi’s output is off, the switch closes, opening the circuit and shutting the solenoid off. Example: https://www.adafruit.com/product/976 1N4001 Diode – this is for protecting the Pi.

How is the solenoid connected to the 12V rail?

Connect the solenoid positive side to the 12V rail and the negative to the collector of the transistor. Be sure to check your component diagram to determine which is the base, collector, and emitter. Connect the collector to the 12V rail through the diode. Connect the emitter to the negative rail.

How do you adjust the output of a solenoid?

Use the screw on top and the multimeter to adjust the output to around 5V. Connect the solenoid positive side to the 12V rail and the negative to the collector of the transistor. Be sure to check your component diagram to determine which is the base, collector, and emitter. Connect the collector to the 12V rail through the diode.

Can a GPIO resistor drive a pi transistor?

To drive this current however a higher base current is required than is possible in this setup with the 1k base resistor – and the limitation of the Pi’s GPIO pins (issue 2). For switching applications the goal is to drive the transistor into the saturation region (keyword to look out for when reading data sheets).

How to control a 12V DC motor with a NPN transistor?

Select a transistor with appropriate ratings (e.g. collector current, Ic) and sufficient driving. Darlington type transistors or FETs come to mind. If you only need on-off control of the motor you may wish to replace the motor in the above circuit with the coil of a 12V relay and use THAT to switch the supply to the motor.

What kind of power supply does Raspberry Pi use?

Since the Raspberry Pi can’t do that alone, I bought an external 12V/10A power supply and a motor controller called BTS7960 (datasheet: here, image below). Connect the external power supply +/- to the numbers 2 and 1 respectively (see the image below for the numbers).

Can a NPN transistor be used as a sink?

Yes. In an NPN transistor current flows from the collector, through the base into the emitter, i.e. it acts as a sink. In your circuit then, +5V from the Pi flows through the stepper motor controller, through the transistor, through to ground. The current only flows when the base is activated.

How does a NPN transistor work in a stepper motor controller?

In an NPN transistor current flows from the collector, through the base into the emitter, i.e. it acts as a sink. In your circuit then, +5V from the Pi flows through the stepper motor controller, through the transistor, through to ground.

What kind of capacitor does Raspberry Pi use?

This spiking will heat up the transistor heavily, so we will be using Diode (1N4007) to provide protection to transistor against Inductive Spiking. In order to reduce the voltage fluctuations, we will be connecting a 1000uF capacitor across the power supply as shown in the Circuit Diagram.

Is there a DC speed control for Raspberry Pi?

DC Motor Speed Control with Raspberry Pi Raspberry Pi is an ARM architecture processor based board designed for electronic engineers and hobbyists. The PI is one of most trusted project development platforms out there now.