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General Category => General Discussion => Topic started by: Markiematic on April 01, 2021, 09:10:40 AM

Title: BRX analog inputs
Post by: Markiematic on April 01, 2021, 09:10:40 AM

Will it work to feed a 2khz pwm signal into an analog input module without filtering?

Title: Re: BRX analog inputs
Post by: BobO on April 01, 2021, 01:01:04 PM

Quote from: Markiematic on April 01, 2021, 09:10:40 AM

Will it work to feed a 2khz pwm signal into an analog input module without filtering?

If is a -3 module, it converts at about 1.1ms, so no. The -1 and -2 modules are considerably slower than that.

Depending on the voltage range of the PWM signal, a high speed input with a pair of timers will give you a near perfect duty cycle reading.