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An MCP3008 code is a ratio to VREF, not an absolute voltage. Use 1024 code intervals, preserve the reference value and do not mistake the top code for VREF itself.
MCP3008 ADC Codes: Convert Readings With the Voltage You Actually Reference Read More
A MAX31855 NaN is a fault flag, not a diagnosis. Read the low three bits to separate an open thermocouple from shorts to ground or supply.
MAX31855 Reads NaN? Decode the Fault Bits Before Rewiring the Thermocouple Read More
A practical sequence for separating probe, threshold, sample-rate, and SPI-mode errors before trusting decoded bytes from a logic analyzer.
When an SPI Logic Analyzer Decodes the Wrong Bytes Read More