initial commit, DHT-22 sensor still need to be addedHEADmaster

2 files changed, 88 insertions, 0 deletions

diff --git a/README.txt b/README.txt
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--- /dev/null
+++ b/README.txt
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+press button on pico and start device by pluggin in USB cable
+picotool load rp2-pico-20220117-v1.18.uf2
+restart
+rshell -p /dev/ttyACM0 --buffer-size 512
+cp pico-tempguard.py /pyboard/main.py
+
+pip install mpremote
+mpremote reset; mpremote run pico-tempguard.py
diff --git a/pico-tempguard.py b/pico-tempguard.py
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+++ b/pico-tempguard.py
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+from machine import Pin, PWM, ADC
+import utime 
+import _thread
+
+def led_blink_nr(nr):
+    internal_led = machine.Pin(25, machine.Pin.OUT)
+    for i in range(0,nr):
+        internal_led.on()
+        utime.sleep(0.3)
+        internal_led.off()
+        utime.sleep(0.3)
+
+def get_temperature():
+    temp_sensor = ADC(4)
+    temperature = temp_sensor.read_u16()
+    to_volts = 3.3 / 65535
+    temperature = temperature * to_volts
+    celsius_degrees = 27 - (temperature - 0.706) / 0.001721
+    return celsius_degrees
+
+def buzz():
+    buzzer = PWM(Pin(15))
+    buzzer.freq(1000)
+    buzzer.duty_u16(1000)
+    utime.sleep(0.1)
+    buzzer.duty_u16(0)
+
+def alarm():
+    for i in range (0,3):
+        buzzer = PWM(Pin(15))
+        buzzer.freq(400)
+        buzzer.duty_u16(1000)
+        utime.sleep(0.5)
+        buzzer.duty_u16(0)
+        buzzer.freq(800)
+        buzzer.duty_u16(1000)
+        utime.sleep(0.5)
+        buzzer.duty_u16(0)
+
+def calc_mean(temp):
+    tr=0
+    for i in range(0,len(temp)):
+        tr=tr+temp[i]
+    return tr/10
+
+
+t = [0, 0, 0, 0, 0, 0, 0, 0 ,0 ,0]
+lock = _thread.allocate_lock()
+
+def second_thread():
+    #print temperature every 5 s
+    while True:
+        #if not lock.locked():
+        lock.acquire()
+        bn = calc_mean(t)
+        lock.release()
+        if get_temperature() >= bn+1:
+            alarm()
+        led_blink_nr(bn)
+        utime.sleep(5)
+
+def main():
+    _thread.start_new_thread(second_thread, ())
+    count = 0
+
+    #get temperture reading every 1 s
+    while True:
+        lock.acquire()
+        #buzz()
+        t[count%10] = get_temperature()
+        lock.release()
+
+        count = count + 1
+        #if count == 10:
+        #    count = 0
+
+        utime.sleep(1)
+
+if __name__=="__main__":
+    main()