Should have mentioned that the JPG plots the error over the range of
samples.

On 20 October 2015 at 10:15, Justin Richards <justin.richards@gmail.com>
wrote:

> I decided to measure and plot the error of the ESP8266 internal ADC.
>
> Thought I would share the results.
>
> PSU HP E3631A and Fluke 87 to set the voltage between 0 and 1.020 Volts.
>
>  V Actual,V ADC
> 0.01,0.001
> 0.02,0.008
> 0.03,0.017
> 0.04,0.028
> 0.05,0.038
> 0.06,0.05
> 0.07,0.06
> 0.08,0.07
> 0.09,0.08
> 0.1,0.09
> 0.11,0.102
> 0.12,0.113
> 0.13,0.124
> 0.14,0.136
> 0.15,0.149
> 0.16,0.158
> 0.17,0.168
> 0.18,0.18
> 0.19,0.189
> 0.2,0.2
> 0.21,0.209
> 0.22,0.221
> 0.23,0.232
> 0.24,0.242
> 0.25,0.253
> 0.26,0.266
> 0.27,0.275
> 0.28,0.285
> 0.29,0.297
> 0.3,0.306
> 0.31,0.316
> 0.32,0.326
> 0.33,0.338
> 0.34,0.35
> 0.35,0.356
> 0.36,0.367
> 0.37,0.38
> 0.38,0.394
> 0.39,0.404
> 0.4,0.412
> 0.41,0.425
> 0.42,0.438
> 0.43,0.447
> 0.44,0.458
> 0.45,0.466
> 0.46,0.477
> 0.47,0.488
> 0.48,0.496
> 0.49,0.508
> 0.5,0.518
> 0.51,0.53
> 0.52,0.54
> 0.53,0.552
> 0.54,0.562
> 0.55,0.573
> 0.56,0.582
> 0.57,0.593
> 0.58,0.603
> 0.59,0.613
> 0.6,0.625
> 0.61,0.635
> 0.62,0.649
> 0.63,0.66
> 0.64,0.669
> 0.65,0.678
> 0.66,0.693
> 0.67,0.701
> 0.68,0.711
> 0.69,0.722
> 0.7,0.731
> 0.71,0.744
> 0.72,0.753
> 0.73,0.763
> 0.74,0.776
> 0.75,0.785
> 0.76,0.795
> 0.77,0.81
> 0.78,0.816
> 0.79,0.829
> 0.8,0.835
> 0.81,0.847
> 0.82,0.857
> 0.83,0.868
> 0.84,0.878
> 0.85,0.891
> 0.86,0.901
> 0.87,0.914
> 0.88,0.925
> 0.89,0.936
> 0.9,0.945
> 0.91,0.957
> 0.92,0.965
> 0.93,0.977
> 0.94,0.986
> 0.95,0.998
> 0.96,1.006
> 0.97,1.018
> 0.98,1.024
> 0.99,1.024
> 1,1.024
> 1.01,1.024
> 1.02,1.024
>
>
--=20
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