Generate 1kHz +-12v PWM

Using Arduino Project Guidance
1

Hi everyone,i’m working on my project.My work is about Electric Vehicle Supply Equipment,so my professor give me a pratice work that is generate +-12 v 1kHz PWM from arduino.I just only know that arduino have some PWM port to generate square wave,but the output will have only 5 v.I think that it should connect to an external circuit.Someone please help me how to increase 5 V to +-12V and change frequency from 490Hz to 1KHz.Thank you for all of help and sorry for my bad English.I’m from Thailand

2

PWM pin 5 and 6 of an Uno/Nano are already about 1kHz (~980Hz).
Is that close enough?

An opamp on a bipolar 15volt supply could be used to amplify 0-5volt to -12volt to +12volt.
Question is what you need to drive with that 24volt peak/peak signal.
Leo..

3

Just send that +-12 v to a dip switch that is connect with some resistor.And i will measure the voltage that change from varying resistor.Example as when i change resistor and voltage drop to 9 v.I will use voltage divider circuit to change 9 v back to the range of 0-5v, so that arduino can measured it

4

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5

Not sure what you mean with that.
Analogue pins can't measure PWM (positive or negative), and can't measure negative voltages.

It seems you want to change 5volt PWM to 0-12volt DC (not +12volt -12volt PWM),
and measure that DC voltage, through a voltage divider with dip switches, with an analogue pin.

For that you need an RC filter, to smoothen 0-5volt PWM to 0-5volt DC.
Followed by an opamp circuit with a gain of 2.4
I think you should ask your professor for help.
He's the one getting paid for that.
Leo..

6

Just connect to a npn transistor switch , that has a resistor connected from its collector to +12v. Base connected to the PWM pin on the Arduino via say 1k, and emitter to 0v.

When the Arduino output switches on/off , the transistor collector will switch 0-12v.

7

  1. OP seems to want DC, not PWM (measuring it with an analogue pin).

  2. The output of a single transistor circuit is influenced by it's load (OP talks about variable loads with DIP switches).

Leo..

8

Thank you very much everyone for answering me.