Protect voltage readout against modification from ISR #92
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An ADC conversion between the two blink_num() calls could potentially update the voltage in a way the the second digit rolls over and the resulting number doesn't make sense. Fixes ToyKeeper#91
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An ADC conversion between the two blink_num() calls could potentially update the voltage in a way the the second digit rolls over and the resulting number doesn't make sense.
Fixes #91