Struggling with Nano code

Projects Programming
1

Hi folks, I am really struggling to get a project to do something I want.
Basically, I have an OLED display, BME module to measure humidity, but I also want to output a 108kHz PWM signal.
Here is the problem - there is a direct conflict because the Wire code uses timer1, and I need this to generate the PWM signal!

I am thinking the only way round this is to find a processor with two 16 bit timers?

I tried softwire but not convinced SSD1306 is compatible,,,

I can show the code if necessary but unless someone has a clever idea without interrupting PWM output I suspect this might be a hardware limitation as opposed to software...

Thanks

3

There are different Nano's so which one do you have exactly

Not much experience with the Nano, but I assume it has more than one timer so if you move the PWM to another PWM pin might solve this.

Google gave me

which states

Arduino Nano has 3 Timers and 6 PWM output pins. The relation between timers and PWM outputs is:
Pins 5 and 6: controlled by timer0
Pins 9 and 10: controlled by timer1
Pins 11 and 3: controlled by timer2

So there is an option to switch timer, don't know if the other timers can do the 108 kHz

4

hI rob, thanks for gettng back to me. It uses the Atmel 328 if that is any help.

Trouble with using the other timers for my PWM is I cannot get the high frequency I need.
I need to literately turn off the prescaler for timer1 to get the high frequency, as far as I can tell I cannot do this with timers 0 or 2.
If I am wrong please correct me.

I am thinking of using a PIC micro on the output of the Atmel. Basically Atmel turns on a 12f1840 which I can then use to generate the PWM, but I'd prefer to do this with a single IC, and I cannot program pics in C as yet, only in assembly LOL

5

Which wire code do you use? I don't think the standard Arduino Wire.h uses timer 1

6

It's only what I read on google, and when I change the timer1 settings, I lose all I2C comms with displays sadly

7

Not in Arduino's AVR core it doesn't. Examine the library source for yourself.

Without even a link to back that up, it's not even hearsay.

8

Nether Timer1 nor Tim0 Tim2 allowed you to produce a 8bit 108khz PWM on atmega328

9

Can you post code demonstrating the problem, or at least the code you use to set up timer 1 for 108KHz PWM?

10

Hi, @mil24

Can you please tell us what your project is?
Why do you need 108KHz PWM output?

Thanks.. Tom.... :smiley: :+1: :coffee: :australia: