Re: Has anyone seen an analog input?
Posted:
Wed Mar 04, 2015 7:08 amby new299
The internal ADC is a bit noisy in part I think because the esp8266 doesn't have a dedicated voltage reference. However it does work in a pinch:
http://41j.com/blog/2015/01/esp8266-analogue-input/I think one of the reasons they don't talk about it a lot is that without a voltage reference it's not likely to be very reliable.
Re: Has anyone seen an analog input?
Posted:
Wed Mar 04, 2015 9:56 amby MK1888
Also, the MCU should be put to sleep when ADC'ing to minimize noise from the master clock. I don't know if it does this, but the firmware could probably be changed to do it.
Re: Has anyone seen an analog input?
Posted:
Wed Mar 04, 2015 11:54 amby EadF
I wonder if the noisy ADC can be used to our advantage - have anyone tried to use it as a
hardware RNG?
Re: Has anyone seen an analog input?
Posted:
Wed Mar 11, 2015 9:18 amby SpenZerX
Hello,
i tried to compile ADC.c and ADC.h.
I want to read the ADC.
The Compiler/Linker gives some errors at functions:
i2c_writeReg_Mask
read_sar_dout
I think the functions are unknown to the compiler/linker
Do i have to add them to ESPmissingincludes?
Are this functions included in all SDKs?