voltmeter.py

from microbit import *

analog_val = 0
analog_val_old = 0
#display.scroll("Simple Voltmeter with autorange.", delay=100)
while True:
  
  analog_val = pin0.read_analog()
  
  if (analog_val != (analog_val_old + 1)|(analog_val_old - 1)):
  
    analog_val_old = analog_val        
    analog_val = (analog_val * 0.0092)                       
    
    if (analog_val >= 1):                        
    
      analog_val = '%.2f' % (analog_val)            
      display.scroll(str(analog_val))            
      display.scroll("V", delay=100)            
      sleep(1000)                
    
    else:
      
      analog_val = analog_val * 1000            
      analog_val = '%.2f' % (analog_val)            
      display.scroll(str(analog_val))            
      display.scroll("mV", delay=100)            
      sleep(1000)