LPC MicrocontrollersのトピックRe: LPC43xx analog output

LPC43xx analog output

luca_bonora89 — Thu, 13 Jun 2019 14:06:32 GMT

Hello everybody, I'm using an LPC43xx.

I'm reading an analog input from the ADC_CH3 and I would like to let an analog motor move when the value read is greater than a certain level.

Is it possible to do something like that with this board?

Thanks in advice

Re: LPC43xx analog output

nxf51211 — Thu, 13 Jun 2019 17:10:59 GMT

Hi,

You can control an analog motor by implementing a PWM signal (where the speed of the motor is determined by the duty cycle of the signal). So you can just set a duty cycle greater than 0 every time your ADC read is greater than a certain level.

PS: I recommend you first check the frequency you would have to configure the PWM so you can have the maximum speed when you set the duty cycle to 100% (You can try this by trial an error of the insertion of different PWM frequencies or you can check if this information is already provided for the motor you would be using).

Best Regards,

Ricardo Delsordo

Re: LPC43xx analog output

luca_bonora89 — Tue, 18 Jun 2019 08:44:32 GMT

Thank you Ricardo for the quick answer. Do you know where could I find an example for my board?? (LPC4337)

Re: LPC43xx analog output

nxf51211 — Tue, 18 Jun 2019 17:25:13 GMT

Hi,

I recommend you check the project examples from LPCOpen for your board (LPC4337) where you will find an example for the use of the ADC and the PWM (using SCT): https://www.nxp.com/support/developer-resources/software-development-tools/lpc-developer-resources-/lpcopen-libraries-and-examples/lpcopen-software-development-platform-lpc43xx:LPCOPEN-SOFTWARE-FOR-LPC43XX

Best Regards,

Ricardo Delsordo.