#!/usr/bin/env python3
# an i2c scanner
# Scans all addresses on the I2C bus and prints the addresses of connected
# modules
# copyright U. Raich 19.3.2019
# This program is released under GPL
# It was written for a workshop on IoT networks at the
# AIS conference 2019, Kampala, Uganda

from machine import *
import time
scl = Pin(5)                 # on the wemos d1 mini scl is connected to GPIO 5
sda = Pin(4)                 # on the wemos d1 mini sda is connected to GPIO 4

i2c = I2C(-1,scl,sda)
addr = i2c.scan()

print("     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f")

j=0
for i in range (0,16):
    print('%02x'%(16*i),end=': ')
    for j in range(0,16):
        if 16*i+j in addr:
            print('%02x'%(16*i+j),end=' ')
        else:
            print("--",end=' ')
    time.sleep(0.1)
    print()