Onewire DS18B20P

federico

Wiring WiPy ver. 2.0 with DS18B20P

1 - # DS18B20P data line connected to WiPy pin P10

* DS18B20P - parasite mode wiring

A - # * DS18B20P GND pin connected to DS18B20P Vin pin
2 - # * DS18B20P GND pin connected to WiPy GND

B - # * in series to DS18B20P/WiPy data line connection point
3 - # * mount an 1 Kohm resistor that will be connected to WiPy 3V3

In micropython example code I have divided by 100
the reading value to obtain the right temperature value

         print(temp.read_temp_async()/100) # added /100

** see the attachment : WiPi2_DS18B20P_readings.jpg
If I am right the tutorial example must be upgraded

from :

One-wire driver

This tutorial explains how to connect and read data from a DS18x20 temperature sensor.

Basic usage

import time
from machine import Pin
from onewire import DS18X20
from onewire import OneWire

#DS18B20 data line connected to pin P10
ow = OneWire(Pin('P10'))
temp = DS18X20(ow)

while True:
print(temp.read_temp_async()/100) # added /100 to have Celsius degrees
time.sleep(1)
temp.start_convertion()
time.sleep(1)