ESP8266 Micropython I2C Scanner

This is a simple very short code example in which we show how to create a basic I2CScanner in Micropython using the uPyCraft IDE for an ESp8266.

The arduino equivalent is one that I use frequently and is one of the most useful sketches for figuring out why a sensor may not be working correctly with a library or code – usually because teh default I2C address differs from the sensor you buy

 

Code

import machine
i2c = machine.I2C(scl=machine.Pin(5), sda=machine.Pin(4))
 
print('Scan i2c bus...')
devices = i2c.scan()
 
if len(devices) == 0:
  print("No i2c device !")
else:
  print('i2c devices found:',len(devices))
 
  for device in devices:  
    print("Decimal address: ",device," | Hexa address: ",hex(device))

 

Output

All going well you should output like the following in uPyCraft – this is a Wemos OLED shield connected to a Wemos Mini

 

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exec(open(‘i2cscanner.py’).read(),globals())
Scan i2c bus…
i2c devices found: 1
Decimal address: 60 | Hexa address: 0x3c
>>>
>>>

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