Now I have assembled a KA431 based regulator as the reference voltage for the MCP3201. The adjustable range is around 2.8V to 4.5V. The KA431 seems to be saturated around 4.5V and could not be adjusted higher than 4.5V, unless I think the Vcc increased from 5V to 6V or 7V.
Next step is to change the program to print decimal values.
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