Hi.
 
I’m sorry. I should have explained that in the eBook.
The callback functions for the timer event must take one argument. The Timer object is passed automatically as an argument to that function when the event is triggered.
You must have that argument even though you don’t use it.
 
For more info you can check the documentation: https://docs.micropython.org/en/latest/library/machine.Timer.html#methods

I’ll add that information to the next eBook update.
 
Thanks.
 
Regards,
Sara

Hi Sara, thank you for your quick answer.
I fond a bug in the code of “Getting Temperature from Multiple Sensors (with Address)” Page 195/196
After the while true statement, there are the two lines

ds_sensor.convert_temp()
time.sleep_ms(750)
missing. Without them the second sensor says, that in my room it a temperatur of 80 °C, a litte to much.
Sencerely yours, Rudolf from Germany

Hi.
Thanks for pointing that out.
I’ll test the code and fix that.
Regards,
Sara

Good morning Sara,
there is a typo on page 138:

from picozero import pico_temp_sensor

# Convert from celsius to fahrenheit

def celsius_to_fahrenheit(temp_celsius):
    temp_fahrenheit = temp_celsius * (9/5) + 32
    return temp_fahrenheit

# Reading and printing the internal temperature

Temperature_c = pico_temp_sensor.temp
Temperature_f = celsius_to_fahrenheit(temperature_c)

print("Internal Temperature:", temperature_c, "°C")
print("Internal Temperature:", temperature_f, "°F")

You defined the temperature with an T but in the print statement the temperature is with a t.

Sencerely Yours,
Rudolf from Germany

Hi Sara, I found a typo on page 203: a ‘d’ too much.

The best and easiest way to find out is to run and I2C scanner. This is a …
Regardes, Rudolf

Thanks.
That was word converting the starting of a sentence automatically to cap words.
Always copy the code from the Github link and not from the PDF.
I’ll fix that. Thanks.
Regards,
Sara