From c1154874502689dcf7ff440bce9faa2ce5bb2fd8 Mon Sep 17 00:00:00 2001
From: Luiz Menezes <luiz.menezesf@gmail.com>
Date: Sun, 13 Sep 2015 19:43:18 -0300
Subject: [PATCH 1/2] Adds an lcd 16x2 example that also uses buzzer and
 buttons

---
 pingo/examples/lcd16x2_countdown.py | 107 ++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 pingo/examples/lcd16x2_countdown.py

diff --git a/pingo/examples/lcd16x2_countdown.py b/pingo/examples/lcd16x2_countdown.py
new file mode 100644
index 0000000..713faeb
--- /dev/null
+++ b/pingo/examples/lcd16x2_countdown.py
@@ -0,0 +1,107 @@
+""" A countdown in a 16x2 LCD.
+It is possible to pause or reset the countdown using buttons.
+When the countdown ends buzzes continuously.
+
+Requires:
+- Adafruit_CharLCD (https://github.com/adafruit/Adafruit_Python_CharLCD)
+
+Hardware:
+- 16x2 LCD (8 digital pins)
+- Buzzer (1 digital pin)
+- 2x buttons (1 digital pin each)
+
+"""
+
+
+import time
+import pingo 
+
+import Adafruit_CharLCD.Adafruit_CharLCD as LCD
+
+
+def startup(): 
+    global lcd, buzzer, pause, pause_status, reset, countdown, COUNTDOWN
+
+    # LCD pins
+    lcd_rs = 18
+    lcd_en = 27
+    lcd_d4, lcd_d5, lcd_d6, lcd_d7 = 22, 23, 24, 25
+
+    # LCD config
+    lcd_backlight = 4
+    lcd_columns = 16
+    lcd_rows = 2
+
+    lcd = LCD(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7, lcd_columns,
+                 lcd_rows, lcd_backlight)
+
+    board = pingo.detect.get_board()
+
+    # buzzer pin (BOARD)
+    buzzer = board.pins[33]
+    buzzer.mode = pingo.OUT
+
+    # pause and reset buttons (BOARD)
+    pause = board.pins[29]
+    pause.mode = pingo.IN
+    reset = board.pins[31]
+    reset.mode = pingo.IN
+
+    COUNTDOWN = 300
+    pause_status = False
+    countdown = COUNTDOWN
+
+
+def beep(interval=0.06, times=4):
+    for _ in range(times):
+        buzzer.hi()
+        time.sleep(interval)
+        buzzer.lo()
+        time.sleep(interval)
+        
+
+def seconds_to_minutes(seconds):
+    minutes = str(countdown / 60).zfill(2)
+    seconds = str(countdown % 60).zfill(2)
+    return '{} min {} seg'.format(minutes, seconds)
+
+
+def reset_countdown(delay_seconds=3):
+    beep(interval=0.03, times=3)
+    for seconds in reversed(range(1, delay_seconds + 1)):
+        lcd.clear()
+        lcd.message(u'RESETANDO...\n{} sec'.format(seconds))
+        time.sleep(1)
+    global countdown
+    countdown = COUNTDOWN
+    lcd.clear()
+
+
+if __name__ == "__main__":
+    startup()
+    while True:
+        lcd.clear()
+
+        if pause.state == pingo.HIGH:
+            pause_status = not pause_status
+            lcd.clear()
+            beep(interval=0.03, times=2)
+
+        if pause_status:
+            lcd.message(u'PAUSADO em\n{}'.format(seconds_to_minutes(countdown)))
+            time.sleep(2.5)
+            continue
+
+        if reset.state == pingo.HIGH:
+            reset_countdown(3)
+
+        if countdown == 0:
+            lcd.message(u'Acabou! Acabou!\nO turno acabou!')
+            beep()
+            time.sleep(0.999)
+            continue
+
+        lcd.message(u'Turno acaba em:\n{}'.format(seconds_to_minutes(countdown)))
+
+        time.sleep(0.999)
+        countdown -= 1

From ec7281cec0869fc16a7462362f32cbbcd388b592 Mon Sep 17 00:00:00 2001
From: Luiz Menezes <luiz.menezesf@gmail.com>
Date: Sun, 13 Sep 2015 18:10:20 -0300
Subject: [PATCH 2/2] flake8 fixes

---
 pingo/examples/lcd16x2_countdown.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/pingo/examples/lcd16x2_countdown.py b/pingo/examples/lcd16x2_countdown.py
index 713faeb..0915db3 100644
--- a/pingo/examples/lcd16x2_countdown.py
+++ b/pingo/examples/lcd16x2_countdown.py
@@ -14,12 +14,15 @@
 
 
 import time
-import pingo 
+import pingo
 
 import Adafruit_CharLCD.Adafruit_CharLCD as LCD
 
 
-def startup(): 
+lcd, buzzer, pause, pause_status, reset, countdown, COUNTDOWN = (None,) * 7
+
+
+def startup():
     global lcd, buzzer, pause, pause_status, reset, countdown, COUNTDOWN
 
     # LCD pins
@@ -33,7 +36,7 @@ def startup():
     lcd_rows = 2
 
     lcd = LCD(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7, lcd_columns,
-                 lcd_rows, lcd_backlight)
+              lcd_rows, lcd_backlight)
 
     board = pingo.detect.get_board()
 
@@ -58,7 +61,7 @@ def beep(interval=0.06, times=4):
         time.sleep(interval)
         buzzer.lo()
         time.sleep(interval)
-        
+
 
 def seconds_to_minutes(seconds):
     minutes = str(countdown / 60).zfill(2)