Search found 4 matches

by freeman
Thu Jan 05, 2017 4:31 pm
Forum: General Discussion
Topic: The analog input parameters for GPIO pins
Replies: 4
Views: 5631

Re: The analog input parameters for GPIO pins

Far from flawed, quite a bit of work has been done on the relationship between eletronic theory and the study of hydrodynamics (sub discipline of fluid mechanics). Arao, here's a quick tutorial in support of Kolban's post. I use a similar analogy using the water system to water the lawn! Maybe it ca...
by freeman
Fri Dec 09, 2016 2:04 pm
Forum: General Discussion
Topic: ESP32 ADC preamp inquiry
Replies: 8
Views: 6523

Re: ESP32 ADC preamp inquiry

Hello... Attenuation has a type adc_atten_t that has four atten settings, 0(ADC_ATTEN_0db),1(ADC_ATTEN_2_5db "2.5db"),2(ADC_ATTEN_6db), and 3(ADC_ATTEN_11db).
by freeman
Wed Nov 30, 2016 10:46 pm
Forum: General Discussion
Topic: ESP32 ADC preamp inquiry
Replies: 8
Views: 6523

Re: ESP32 ADC preamp inquiry

Hello StefanRavn. SparkFun has more info about this device on their website (ESP32 Thing product). You are correct that some pins may be used for ADC only, as these do not have pull up resistors as other GPIO pins. On four of the pins they use 270pF caps for stabilization of the ADC performance. The...
by freeman
Thu Nov 17, 2016 5:27 am
Forum: General Discussion
Topic: ESP32 ADC preamp inquiry
Replies: 8
Views: 6523

ESP32 ADC preamp inquiry

Hello, I would like to locate the analog specs for the ADC preamp. Seems like I read somewhere that the preamp has 60db of gain (amplification). Background: My ESP32 implementation will include an external bandpass filter on the analog input (w/ or w/o preamp feature). The low pass filter section ha...

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