diff --git a/src/alarm.py b/src/alarm.py
new file mode 100644
index 0000000..75eca7d
--- /dev/null
+++ b/src/alarm.py
@@ -0,0 +1,13 @@
+import board
+import pulseio
+
+alm = pulseio.PWMOut(board.GP1,frequency=2200,duty_cycle=0)
+
+def alarm(action=True):
+    if action:
+        alm.duty_cycle = 6500
+    else:
+        alm.duty_cycle = 0
+
+if __name__ == "__main__":
+    alarm()
\ No newline at end of file
diff --git a/src/boot.py b/src/boot.py
new file mode 100644
index 0000000..607209a
--- /dev/null
+++ b/src/boot.py
@@ -0,0 +1,2 @@
+import storage
+storage.remount("/", readonly=False)
diff --git a/src/code.py b/src/code.py
new file mode 100644
index 0000000..e0d1202
--- /dev/null
+++ b/src/code.py
@@ -0,0 +1,141 @@
+import time
+from smoke import mesure_smoke
+from drop import mesure_drop
+from temperature import mesure_temp
+from electricity import mesure_electricity
+from erequest import check_netstatus,postdata,rt,eth_init,check_time,get_data,post_data
+from alarm import alarm
+from light import flash_led
+from led import show_num
+from config import SERVER_URL,MAX_ALM,TIMESPAN,A_FIRE,A_TEMP,A_HUM,SN
+import board
+import digitalio
+import microcontroller
+
+btn = digitalio.DigitalInOut(board.GP0)
+btn.direction = digitalio.Direction.INPUT
+
+def make_alarm(errcode):
+    global MAX_ALM
+    if MAX_ALM and errcode < 7:
+        alarm(True)
+        flash_led('alarm')
+    else:
+        flash_led('alarm')
+        alarm(False)
+    
+def stay_normal():
+    alarm(False)
+    flash_led('normal')
+    
+def button_handle():
+    global MAX_ALM
+    if btn.value == True and MAX_ALM == True:
+        MAX_ALM = False
+    elif btn.value == True and MAX_ALM == False:
+        #  recover to alarm
+        MAX_ALM = True
+
+def update_config(cmd, param):
+    try:
+        with open('config.py','r') as f:
+            cfgstr = f.read()
+        cmdbegin = cfgstr.find(cmd)
+        cmdend = cfgstr[cmdbegin:].find('\r\n')
+        if cmdend < 0:
+            cmdend = cfgstr[cmdbegin:].find('\n')
+        newstr = cfgstr.replace(cfgstr[cmdbegin:cmdbegin+cmdend],cmd+'='+param)
+        with open('config.py','w') as f2:
+            f2.write(newstr)
+        return True
+    except:
+        return False
+        
+def env_detect():
+    global rt
+    errno = 0  #  error code
+    conn = True
+    if not eth_init():
+        time.sleep(5)
+        microcontroller.reset()
+    if check_netstatus == 1:
+        errono = 1
+        show_num(errono)
+        conn = False
+        time.sleep(600)
+        microcontroller.reset()
+        return None
+    try:
+        check_time()
+    except:
+        errono = 1
+        show_num(errno) 
+    em = sm = dm = 0
+    tm = [0,0]
+    sm = mesure_smoke()
+    if sm > A_FIRE:
+        show_num(10)
+        time.sleep(180)   # wait smoke sensor to get ready
+    begin_time = time.monotonic()   # for counting timespan    
+    while True:
+        i = 0        
+        button_handle()
+        try:
+            em = mesure_electricity()
+            sm = mesure_smoke()
+            dm = mesure_drop()
+            tm = mesure_temp()
+            while tm[0] == 0 and i < 5:
+                tm = mesure_temp()
+                i += 1
+        except:
+            errno = 8   #  measure fail
+        if sm > A_FIRE:
+            errno = 6  # fire alarm
+        elif dm == True:
+            errno = 5  # water drop alarm
+        elif em == False:
+            errno = 4  # power off
+        elif tm[0] > A_TEMP:
+            errno = 2  #  hot temperature
+        elif tm[1] > A_HUM:
+            errno = 3  #  high humidity
+        elif conn == False:
+            errno = 7
+        else:
+            errno = 0        
+        data = {"sn":SN, "errno":errno, "electricity":em, "fire":sm, "water":dm, "temperature":tm[0], "humidity":tm[1]}
+        print(data)
+        if (time.monotonic()-begin_time)/60 >= TIMESPAN:
+            try:
+                post_data(SERVER_URL+'/env/api/',data)
+                conn = True
+            except:
+                errno = 7  #  Sending data fail
+                time.sleep(2)
+                conn = False
+                microcontroller.reset()
+            begin_time = time.monotonic()
+        show_num(errno)
+        if errno == 0:
+            stay_normal()
+        else:
+            make_alarm(errno)
+        if rt.datetime[4] == 0 and rt.datetime[5] < 5:
+            microcontroller.reset()
+        time.sleep(3)
+        try:
+            cmddata = {'spot':SN}
+            cmd = get_data(SERVER_URL+'/env/cmd/',cmddata)
+            if cmd and cmd.count('$')==1:
+                cmdlist = cmd.split('$')
+                if not cmdlist[1]:
+                    microcontroller.reset()
+                if update_config(cmdlist[0],cmdlist[1]):
+                    microcontroller.reset()
+        except:
+            pass
+        
+if __name__ == '__main__':
+    env_detect()
+
diff --git a/src/config.py b/src/config.py
new file mode 100644
index 0000000..12432b9
--- /dev/null
+++ b/src/config.py
@@ -0,0 +1,13 @@
+SERVER_URL='http://172.18.17.136:8000'
+IP_ADDR='2.50.41.115'
+MAC_ADDR='de:ad:be:82:31:10'
+NET_MASK='255.255.255.128'
+GATEWAY='2.50.41.1'
+DNS='114.114.114.114'
+SN='WJSPJ001'
+SECRET='@This is a Secret $tr!'
+MAX_ALM=True   # alarm sound
+TIMESPAN=5   # minute
+A_FIRE=18000  # fire alarm trigger number
+A_TEMP=32.0
+A_HUM=75.0
\ No newline at end of file
diff --git a/src/drop.py b/src/drop.py
new file mode 100644
index 0000000..ce7d703
--- /dev/null
+++ b/src/drop.py
@@ -0,0 +1,19 @@
+import board
+import digitalio
+import time
+
+dropio = digitalio.DigitalInOut(board.GP9)
+dropio.direction = digitalio.Direction.INPUT
+
+def mesure_drop():
+    try:
+        # print(dropio.value)
+        return dropio.value
+    except:
+        return 0
+
+if __name__ == "__main__":
+    while True:
+        # print(dropio.value)
+        time.sleep(1)
+        print(mesure_drop())     
\ No newline at end of file