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| | * We use '''[https://www.sketching-with-hardware.org/files/netvars.py netvars.py]''' | | * We use '''[https://www.sketching-with-hardware.org/files/netvars.py netvars.py]''' |
| | * OPTIONAL: you can download the files to set up your own server. This is in php and requires mySQL. https://www.sketching-with-hardware.org/files/netvarsServer.zip (see readme for details) | | * OPTIONAL: you can download the files to set up your own server. This is in php and requires mySQL. https://www.sketching-with-hardware.org/files/netvarsServer.zip (see readme for details) |
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| − | == Related Components ==
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| − | The components are related to the [[LMUBox]]. For more components, see the [[Hardware List]]. Many of the pages on actuators and sensor include additional examples.
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| − |
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| − | === Microcontroller ===
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| − | * [[ESP32 Web Kit]] with integrated OLED Display from Heltec
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| | | | |
| | = Instructional Videos = | | = Instructional Videos = |
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| − | == Connecting to WiFI and using Network Variables == | + | == Writing to the OLED Display over I2C == |
| − | In this video on youtube (8:52) we show how to Connect the ESP32/ESP8266 to the Internet and how to use the netvars.py module to use variables stored on the server. | + | In this video on youtube (22:00) we show how to write text to the OLED Display on the ESP32 module. We then show how to connect a poti to an analog input and display the value in a loop on the display: https://youtu.be/UbxwePvgX-U |
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| − | <youtube>PJ3nQo_Hw3I</youtube> | + | <youtube>UbxwePvgX-U</youtube> |
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| | == Using the uPyCraft IDE to upload files == | | == Using the uPyCraft IDE to upload files == |
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| | <youtube>MXfj_gWf0z4</youtube> | | <youtube>MXfj_gWf0z4</youtube> |
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| | = Code Examples = | | = Code Examples = |
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| | print(a) # will print valTest222 | | print(a) # will print valTest222 |
| | </syntaxhighlight> | | </syntaxhighlight> |
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| − | == Code Example for use in Jupyter Notebook: updated netvars.py ==
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| − | This has our server address hard coded - if you run it on your server you have to adapt the URLs.
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| − |
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| − | <syntaxhighlight lang="python" line='line'>
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| − | import network, socket
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| − | def initNet(ssid, passwd):
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| − | wlan = network.WLAN(network.STA_IF)
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| − | wlan.active(True)
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| − | if not wlan.isconnected():
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| − | print('connecting to network...')
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| − | wlan.connect(ssid, passwd)
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| − | while not wlan.isconnected():
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| − | pass
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| − | print('network config:', wlan.ifconfig())
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| − |
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| − | def http_get(url):
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| − | #print(url)
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| − | #print("............")
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| − | _, _, host, path = url.split('/', 3)
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| − | addr = socket.getaddrinfo(host, 80)[0][-1]
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| − | print ("fetch from: ", addr)
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| − | s = socket.socket()
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| − | s.connect(addr)
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| − | s.send(bytes('GET /%s HTTP/1.1\r\nHost: %s\r\n\r\n' % (path, host), 'utf8'))
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| − | #print(s)
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| − | retStr =""
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| − | while True:
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| − | data = s.recv(1024)
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| − | #print(data)
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| − | if data:
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| − | # this would be all
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| − | #retStr = retStr +str(data, 'utf8')
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| − | # Only the last line
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| − | retStr = str(data, 'utf8')
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| − | #print(str(data, 'utf8'), end='')
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| − | #print(retStr)
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| − | break
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| − | else:
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| − | print("---data")
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| − | #print(retStr)
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| − | break
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| − | s.close()
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| − | return retStr
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| − |
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| − | def setNetVar(varName, varVal):
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| − | urlStr = "https://ubicomp.net/sw/db1/var2db.php?varName=" + str(varName) + "&varValue=" + str(varVal)
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| − | #print(urlStr)
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| − | # http_get("https://ubicomp.net/sw/db1/var2db.php?varName=test3&varValue=14")
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| − | # http_get("https://ubicomp.net/sw/db1/var2db.php?varName=test222&varValue=valTest222")
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| − | http_get(urlStr)
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| − |
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| − | def getNetVar(varName):
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| − | urlStr = "https://ubicomp.net/sw/db1/var2db.php?varName=" + str(varName)
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| − | #print(urlStr)
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| − | # http_get("https://ubicomp.net/sw/db1/var2db.php?varName=test3&varValue=14")
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| − | # http_get("https://ubicomp.net/sw/db1/var2db.php?varName=test222&varValue=valTest222")
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| − | resStr = http_get(urlStr)
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| − | # import re # standrad python
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| − | import ure
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| − | #_, retVar0 = ure.split('\r\n\r\n|\n\n',resStr)
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| − | # retVar = ure.split(' |\n|\r',retVar0)
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| − | reg1 = ure.compile('\r\n\r\n|\n\n')
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| − | reg2 = ure.compile(' |\n|\r')
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| − | #print(reg1)
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| − | #print(reg1.split(resStr))
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| − | _, retVar0, _ = reg1.split(resStr)
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| − | #print(retVar0)
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| − | retVar = reg2.split(retVar0)
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| − | #print(retVar)
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| − | return retVar[2]
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| − |
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| − | #Example usage
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| − | # from netvars import setNetVar, getNetVar, http_get, initNet
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| − | # # assuming there is a network with ssid hotspot1 and password 123456789
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| − | # initNet("hotspot1", "123456789")
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| − | # setNetVar("test222", "valTest222")
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| − | # a=getNetVar("test222")
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| − | # print(a) # will print valTest222
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| − |
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| − | # # assuming there is a network with ssid hotspot1 and password 123456789
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| − | # connect to wifi
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| − | initNet("as62", "VivienPetraAlbrecht")
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| − | # set the variale with the name test222 to the value valTest222
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| − | setNetVar("1000_albrecht_test222", "XXXalbrecht_valTest222")
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| − | # read the variable test222 from the server and print it
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| − | a=getNetVar("1000_albrecht_test222")
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| − | print(a) # will print valTest222
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| − | </syntaxhighlight>
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| − |
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| | | | |
| | == Code Example: netvars.py == | | == Code Example: netvars.py == |
| − | This has our server address hard coded - if you run it on your server you have to adapt the URLs.
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| − |
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| | <syntaxhighlight lang="python" line='line'> | | <syntaxhighlight lang="python" line='line'> |
| | import network | | import network |
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| | # print(a) # will print valTest222 | | # print(a) # will print valTest222 |
| | </syntaxhighlight> | | </syntaxhighlight> |
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| − |
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| − | == Debugging Network Variables ==
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| − | For debugging you can see all the variables in our test installation by accessing:
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| − | https://ubicomp.net/sw/db1/var2db.php
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