1 2 Previous Next 16 Replies Latest reply on Apr 29, 2011 9:28 AM by userc_43966

# how to generate a square wave of frequency 50 Hz using PSOC3

IT SHOULD HAVE AN AMPLITUDE OF MORE THAN 5V.

• ###### 1. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi Sakki,

A 50Hz square wave can be generated using a PWM of Time period = 20ms and duty cycle of 50%.

But the max voltage possible from PSoC is 5V.

Hence one way to get higher voltage, say 12V is using external transistor with Vcc of 12V.

Regards,

dasg

• ###### 2. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi Sakki,

I have attached a project in which PWM component is used to generate 50Hz square wave.

It also shows the diagram of external cmponents used (a transistor and resistors, Rb = 15K and Rc = 2.2K) to get a square wave which is inverted.

• ###### 3. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi,

The snap-shots taken from oscilloscope are also attached.

Regards,

dasg

• ###### 4. Re: how to generate a square wave of frequency 50 Hz using PSOC3

the PWM block is not shown etc.

can u tell me steps to do it so that i can do it .

plz help

• ###### 5. Re: how to generate a square wave of frequency 50 Hz using PSOC3

I have already done some projects using PWM and counter, but im not able to produce a 20 ms time period wave(50Hz)

im only getting .2 microseconds..what should I do?

• ###### 6. Re: how to generate a square wave of frequency 50 Hz using PSOC3

CY8C38666AXI-040 ES2 production is the device i'm using.

• ###### 7. Re: how to generate a square wave of frequency 50 Hz using PSOC3

hi

• ###### 8. Re: how to generate a square wave of frequency 50 Hz using PSOC3

hi ,

Sakki is my brother as I told him he contacted for this project.

I'm deepak doing my B.Tech from Government.Engineering College, Kozhikode, Kerala, India.

I'm doing my final year project on PSoC. My group has already purchased the develepor kit from Cypress.

We have been working on PSoC 3 for the particular square wave output, but not able to produce 50Hz.

The project you have sent is not working in our software version, updation is required.

Would you please tell us how u configured the PWM block, and all step if possible.

My humble request to you. plz help us.

• ###### 10. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi Sakki,

First and foremost you need to upgrade the PSoC Creator to PSoC Creator 1.0 since the project I had attached before was done in this version.

Also, since the PSoC you are using is ES2, you need to choose the appropriate device.

For this, do the following:

1) Right click on the project name in workspace and go to 'Device Selector'.

2) In the Select Device tab, select the appropriate device you have on the processor module, and select the right 'Device Revision', which in your case is ES2. This is available at the bottom right corner of the tab.

Regarding the configuration of the PWM:

1) The clock used is 1MHz.

2) The PWM Period is set to 19,999 as period = (19,999 + 20,000)* 1 micro second = 20 ms (to get 50Hz frequency).

3) The Compare Value is set to 10,000 so that the the duty cycle is 50% as 10,000 / 20,000 = 0.5.

Let us know if this works.

Regards,

dasg

• ###### 11. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi dasq,

I have obtained the square wave with the help of the project you have send earlier. We actually need complementary square wave of same amplitude to drive inverter circuit; but we are not getting the inverted square wave.

Used NOT, LUT etc. Some times we get the output and suddenly it dissappears. We need an amplitude between 2-4V for both the square waves.

Plz help..

• ###### 12. Re: how to generate a square wave of frequency 50 Hz using PSOC3

Hi Deeps,

I have attached the project with NOT gate connected to the output so that we can get 50Hz Signal and also its Inverted signal.

The amplitude of the square wave is 3.3V

• ###### 13. Re: how to generate a square wave of frequency 50 Hz using PSOC3

The snap shot attached below shows the two 50Hz signals which are 180 degrees out of phase (inverted).

• ###### 14. Re: how to generate a square wave of frequency 50 Hz using PSOC3

hi dasq,

Thanks for sending the project, hope this will work. But can u tell wat is our problem in obtaining this simple one.

Yesterday, we got it using LUT but it dissappeared, supply were not removed.

May be a problem of CRO, we will try it on DSO.

DSO is not familiar to us, but still have a try.

But still a huge work to be done on this project.

POWER INVERTER CUM INTE;LLEGENT BATTERY CHARGING SYSTEM

Need to program for intelligence.

Your friend U2 sugested some ideas, can u give us some ideas.

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