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m5-adc-test's Introduction

M5シリーズ（一部)のADコンバーターについて調べてみた

M5シリーズのADCで取得できる値や精度について少し調べてみました。

計測について

analogReadMilliVolts()関数を使用して、ADCのデータを補正し、mVに変換された値を利用

M5 nano C6(個体1)

ADC1 : G1
ADC2 : G2

デジタルテスター ADC1 ADC2
0.197 0.200 0.200
0.267 0.267 0.267
0.400 0.412 0.412
0.553 0.560 0.560
0.810 0.808 0.808
1.010 1.010 1.010
1.480 1.482 1.482
1.856 1.863 1.863
2.010 2.018 2.018
2.407 2.420 2.420
2.748 2.760 2.760
3.070 3.084 3.084
3.375 3.395 3.395
3.589 3.612 3.612
3.736 3.707 3.707
3.827 3.723 3.723
4.057 3.723 3.723

M5 nano C6(個体2)

ADC1 : G1
ADC2 : G2

デジタルテスター ADC1 ADC2
0.092 0.094 0.094
0.145 0.145 0.145
0.571 0.576 0.576
1.003 1.003 1.003
1.407 1.415 1.415
1.776 1.787 1.787
2.060 2.073 2.073
2.363 2.375 2.375
2.731 2.742 2.742
3.016 3.028 3.028
3.240 3.254 3.254
3.552 3.568 3.568
3.743 3.708 3.708
3.872 3.720 3.720
4.030 3.726 3.726

M5 ATOM S3

ADC1 : G1
ADC2 : G2

デジタルテスター ADC1 ADC2
0.107 0.100 0.100
0.286 0.286 0.286
0.567 0.567 0.567
0.992 0.974 0.974
1.301 1.285 1.285
1.704 1.695 1.696
2.041 2.032 2.032
2.600 2.579 2.579
2.967 2.947 2.947
3.020 3.000 3.000
3.170 3.082 3.082
3.254 3.082 3.082

M5 ATOM S3のほうが、ノイズがすくなく安定した値が出ていた。

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