ADS7128 Statistics Test
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Test 1: Min/Max tracking across voltage change
  CH0=HIGH: CH1 reads 5.00 V
  Max=4091 Min=4090 (should be similar)
  CH0=LOW: CH1 reads 0.00 V
  Max=4091 Min=0
  Max - Min = 4091 counts
  PASS: Max > Min by >1000 counts

Test 2: resetStatistics clears min/max
  After reset + CH0=HIGH readings:
  Max=4091 Min=4091
  Max - Min = 0 counts
  PASS: Max - Min < 100

Test 3: getRecent matches analogRead
  analogRead=4091 getRecent=4091 diff=0
  PASS: difference < 20

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RESULTS: 3/3 tests passed
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