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Pysense

Learn how to obtain location data and post to Wia with the Pysense extension board.

Pycom Pysense

Pycom Pysense

Components

  • Any Pycom board that supports the connection through Wifi
  • Pycom Pysense board
  • Micro USB to USB cable

Setup Your Development Environment

We'll be using Atom as our development environment.
You can download the latest version from here.

Once you've got it setup, install the Pymakr plugin. Follow the steps in this tutorial to get it setup.

Using Windows 7?

Pysense will work out of the box for Windows 8/10/+, Mac OS as well as Linux. If using Windows 7, drivers to support the boards will need to be installed. You can find them here .

Connect to the Board

  • Before connecting your module to the Pysense board, you should update the firmware on the
    Pysense. Instructions on how to do this can be found here Look for the reset button on the module (located at a corner of the board, next to the LED)
  • Locate the USB connector on the Pysense
  • Insert the module on the Pysense with the reset button pointing towards the USB connector. It should firmly click into place and the pins should now no longer be visible.
  • Connect the USB port on Pysense board to the USB port on the computer
Pysense

Pysense

Get Device Name

Once you've got it connected to your computer, get the name of your device using one of the following steps:

Linux and Mac OS X

  • Download and install the FTDI drivers from here. Select the appropriate version for your operating system and architecture.
  • Open a terminal window and run the command ls /dev/tty*
  • Look for a device with the name that begins with /dev/tty e.g. /dev/tty.usbmodemPy343431 on MAC or /dev/ttyUSB0/dev/ttyACM0 on Linux.

For Linux, you may need to run the two commands below. Once you've completed that, reboot your computer. This will add permissions that will allow you to upload a sketch to the board.

sudo usermod -a -G tty ${USER}
sudo usermod -a -G dialout ${USER}

Windows

  • Download and install the FTDI drivers from here. Select the appropriate version for your operating system and architecture.
  • Open the Windows start menu and search for 'Device Manager'
  • The COM port for the Pycom device will be listed as 'USB Serial Device' or something similar
    • Keep note of the COM port (e.g. COM4)

Setup Your Project

  • Create a new folder for your project. I'm going to call mine pycom-pysense.
  • In Atom, go to File > New Window to open a new window.
  • Add your newly created folder by clicking File > Add Project Folder and navigating to it.
  • If the Pymakr plugin is not open at the bottom of your Atom window, click on the arrow on the right hand side to open it.
  • Select Settings > Project Settings. In the address field replace the value with the device name from the step above e.g. /dev/tty.usbmodemPy343431 (Mac OS X), COM3 (Windows), /dev/ttyACM0 (Linux) then save the file.

Add required Libraries

  • Right click on the folder name in Atom and click Add Folder. Enter lib as the folder name.
  • Right click on the lib folder and click New File. Enter urequests.py as the file name.
  • Click on the file then copy and paste the code from here into that file then save it.

  • For Pysense, additional libraries must also be added to the lib folder, these can be found here

Publish an Event

  • In Atom, right click on your project and click New File. Enter boot.py as the filename.
  • Copy and paste the code below into the file.
from machine import UART
import machine
import os

uart = UART(0, baudrate=115200)
os.dupterm(uart)

machine.main('main.py')
  • Right click on your project and click New File. Enter main.py as the filename.
  • Copy and paste the code below into the file.
from network import WLAN
from pysense import Pysense
from SI7006A20 import SI7006A20
import urequests as requests
import socket
import time

py = Pysense()
si = SI7006A20(py)

# Your WiFi network credentials
WIFI_SSID = 'your-wifi-ssid'
WIFI_KEY = 'your-wifi-password'

# Get this from the Wia dashboard
DEVICE_SECRET_KEY = 'your-wifi-ssid'

url = "https://api.wia.io/v1/events"
headers = { "Authorization": "Bearer " + DEVICE_SECRET_KEY, "Content-Type": "application/json" }

wlan = WLAN(mode=WLAN.STA)
nets = wlan.scan()

# Connect to the WiFi network
for net in nets:
    if net.ssid == WIFI_SSID:
        print('Network found!')
        wlan.connect(net.ssid, auth=(net.sec, WIFI_KEY), timeout=5000)
        print('Connecting...')
        while not wlan.isconnected():
             machine.idle() # save power while waiting
        print('WLAN connection succeeded!')
        break


# Post an Event to the Wia cloud
def post_event(name, data):
    try:
        json_data = { "name": name, "data": data }
        print str(json_data)
        if json_data is not None:
            req = requests.post(url=url, headers=headers, json=json_data)
            return req.json()
        else:
            pass
    except:
        pass

# main loop
while True:
    # Takes the temperature from the Pysense expansion board
    post_event("hello-wia", "")
    time.sleep(10)

Replace the following values of the following variables:

  • WIFI_SSID with your WiFi network name.
  • WIFI_KEY with your WiFi network password.
  • DEVICE_SECRET_KEY with your device secret key from earlier (the one that begins with d_sk).

Your folder structure should now look like this:

  • lib
    • urequests.py
    • LIS2HH12.py
    • LTR329ALS01.py
    • MPL3115A2.py
    • SI7006A20.py
    • pycoproc.py
    • pysense.py
  • boot.py
  • main.py

Click Upload in the Pymakr plugin at the bottom of your window in Atom and send the code to your Pycom board. Now go to the Wia dashboard and you should see it appearing in your device overview.

publish an Event to Wia

publish an Event to Wia

If you get "Uploading project (main folder)..." Error

Try updating the firmware. For the development board click here.

For additional firmware for the Pysense/Pytrack board click here.

Now go to your device in the Wia dashboard and you should see the data appearing in the debugger.

Wia Device Debugger

Wia Device Debugger

Pysense


Learn how to obtain location data and post to Wia with the Pysense extension board.

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