前回に続いて、ブラウザー経由で有機ELディスプレイに文字を表示する機能を追加してみました。
こんな感じです。
せっかくのディスプレイなので、起動時に自分のIPアドレスを表示してアクセスの便宜を図ってみます。
ブラウザーでアクセス、フィールドに入力してボタンをクリック
有機ELディスプレイの接続やライブラリのインストール等については以下を参照
今回は日本語対応はしません。
Pi Pico （W）で有機ELディスプレイに日本語表示（メモ）
前回同様にサーバーのコードなどの解説は以下を参照
Raspberry Pi Pico W | Create a Simple HTTP Server
コード
以下が追加された部分です。
有機ELディスプレイ（OLED）の定義
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#追加 import ssd1306 #追加 #oled sda = machine.Pin(0) scl = machine.Pin(1) i2c = machine.I2C(0,sda=sda, scl=scl, freq=400000) oled = ssd1306.SSD1306_I2C(128, 64, i2c)すsubmittｔみｍｂ |
submitによるGETリクエストの文字列取得
nameが ‘txtstr’ のvalueの値を取得
<input type=”text” name=”txtstr” size=”10” value=”“>
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#追加 def parse_params(part): parameters = {} for piece in part.split(" "): if "/?" in piece: piece = piece.replace("/?", "") amp_split = piece.split("&") for param_set in amp_split: eq_split = param_set.split("=") parameters[eq_split[0]] = eq_split[1] return parameters def get_value(request,name): request = str(request).replace("b'","").replace("'","") request = request.split("\\r\\n") for part in request: if "/?" and "GET" in part: params = parse_params(part) if params: print(f"Params: {params}\n") print(params[name]) return params[name] |
有機ELに文字列表示
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#追加 def write_oled(text): oled.fill(0) oled.text(text, 0, 5) oled.show() |
HTMLにボタン追加
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/*追加*/ <br>.buttonC { background-color: #ffffff; border: 2px solid #000000;; color: black; padding: 15px 64px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; }<br> |
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<!--追加--> <center> <button class="buttonC" name="job" value="C" type="submit">OLED 表示</button> <input type="text" name="txtstr" size="10" value=""> |
ネット接続が確立したらIPアドレス表示
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#追加 write_oled(status[0]) |
ボタンクリック時の戻り値
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#追加 oled_on = request.find('job=C') |
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#追加 print( 'OLED = ' + str(oled_on)) |
追加ルーチン
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#追加 if oled_on == 8: print("oled on") val = get_value(request,'txtstr') oled_text = val oled_text = oled_text.replace("+", " ") write_oled(oled_text) temp_text = "" |
結果表示
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#追加 stateis = ledState + ":" + temp_text + ":" + oled_text |
フルコードです
「追加」の文字があるところが前回と異なるところ
【main.py】
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import time import network import socket import machine #追加 import ssd1306 import utime #LED led = machine.Pin("LED", machine.Pin.OUT) ledState = 'LED State Unknown' #追加 #oled sda = machine.Pin(0) scl = machine.Pin(1) i2c = machine.I2C(0,sda=sda, scl=scl, freq=400000) oled = ssd1306.SSD1306_I2C(128, 64, i2c) # val_A = 0 temp_text = "" oled_text = "" #自宅Wi-FiのSSIDとパスワードを入力 ssid = '＜SSID＞' password = '＜パスワード＞' wlan = network.WLAN(network.STA_IF) wlan.active(True) wlan.connect(ssid, password) # sensor_temp = machine.ADC(4) conversion_factor = 3.3 / (65535) def read_temperature(): reading = sensor_temp.read_u16() * conversion_factor # The temperature sensor measures the Vbe voltage of a biased bipolar diode, connected to the fifth ADC channel # Typically, Vbe = 0.706V at 27 degrees C, with a slope of -1.721mV (0.001721) per degree. temperature = 27 - (reading - 0.706)/0.001721 return str(temperature) #追加 def parse_params(part): parameters = {} for piece in part.split(" "): if "/?" in piece: piece = piece.replace("/?", "") amp_split = piece.split("&") for param_set in amp_split: eq_split = param_set.split("=") parameters[eq_split[0]] = eq_split[1] return parameters def get_value(request,name): request = str(request).replace("b'","").replace("'","") request = request.split("\\r\\n") for part in request: if "/?" and "GET" in part: params = parse_params(part) if params: print(f"Params: {params}\n") print(params[name]) return params[name] #追加 def write_oled(text): oled.fill(0) oled.text(text, 0, 5) oled.show() led.value(1) html = """<!DOCTYPE html><html lang="ja"> <head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="icon" href="data:,"> <style>html { font-family: sans-serif; display: inline-block; margin: 0px auto; text-align: center;} .buttonA { background-color: #ffffff; border: 2px solid #000000;; color: black; padding: 15px 64px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; } .buttonB { background-color: #ffffff; border: 2px solid #000000;; color: black; padding: 15px 64px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; } /*追加*/ .buttonC { background-color: #ffffff; border: 2px solid #000000;; color: black; padding: 15px 64px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; } text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;} </style></head> <body><center><h1>Pi Pico W OPs</h1></center><br><br> <form><center> <center> <button class="buttonA" name="job" value="A" type="submit">LED 点灯・消灯</button> <br><br> <center> <button class="buttonB" name="job" value="B" type="submit">温度センサー値 取得</button> <br><br> <!--追加--> <center> <button class="buttonC" name="job" value="C" type="submit">OLED 表示</button> <input type="text" name="txtstr" size="10" value=""> </form> <br><br> <br><br> <p>%s<p></body></html> """ # Wait for connect or fail max_wait = 10 while max_wait > 0: if wlan.status() < 0 or wlan.status() >= 3: break max_wait -= 1 print('waiting for connection...') time.sleep(1) # Handle connection error if wlan.status() != 3: raise RuntimeError('network connection failed') else: print('Connected') status = wlan.ifconfig() print( 'ip = ' + status[0] ) led.value(0) led.value(0) #追加 write_oled(status[0]) # Open socket addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1] s = socket.socket() s.bind(addr) s.listen(1) print('listening on', addr) # Listen for connections, serve client while True: try: cl, addr = s.accept() print('client connected from', addr) request = cl.recv(1024) print("request:") print(request) request = str(request) led_on = request.find('job=A') temp_on = request.find('job=B') #追加 oled_on = request.find('job=C') print( 'LED = ' + str(led_on)) print( 'TEMP = ' + str(temp_on)) #追加 print( 'OLED = ' + str(oled_on)) if led_on == 8: if val_A == 0: led.value(1) val_A = 1 else: led.value(0) val_A = 0 print("led on") temp_text = "" oled_text = "" if temp_on == 8: print("temp on") temp_text = read_temperature() + "℃" oled_text = "" #追加 if oled_on == 8: print("oled on") val = get_value(request,'txtstr') oled_text = val oled_text = oled_text.replace("+", " ") write_oled(oled_text) temp_text = "" ledState = "LED 消灯:" if led.value() == 0 else "LED 点灯:" # a compact if-else statement # Create and send response #追加 stateis = ledState + ":" + temp_text + ":" + oled_text response = html % stateis cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n') cl.send(response) cl.close() except OSError as e: cl.close() print('connection closed') |
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