Sonar enable/disable

examples/wifi/sonar_disable.py

@@ -0,0 +1,84 @@
+"""
+ Copyright (c) 2020 Alan Yorinks All rights reserved.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3 as published by the Free Software Foundation; either
+ or (at your option) any later version.
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU AFFERO GENERAL PUBLIC LICENSE
+ along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+
+import asyncio
+import sys
+import time
+from telemetrix_aio import telemetrix_aio
+
+"""
+This program continuously monitors an HC-SR04 Ultrasonic Sensor
+It reports changes to the distance sensed.
+"""
+TRIGGER_PIN = 4
+ECHO_PIN = 5
+
+# indices into callback data
+REPORT_TYPE = 0
+TRIG_PIN = 1
+DISTANCE = 2
+TIME = 3
+
+
+# A callback function to display the distance
+async def the_callback(data):
+    """
+    The callback function to display the change in distance
+    :param data: [report_type = PrivateConstants.SONAR_DISTANCE, trigger pin number, distance, timestamp]
+    """
+    date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(data[3]))
+    print(f'Sonar Report: Trigger Pin: {data[1]} Distance: {data[2]} Time: {date}')
+
+
+async def sonar(my_board, trigger_pin, echo_pin, callback):
+    """
+    Set the pin mode for a sonar device. Results will appear via the
+    callback.
+
+    :param my_board: telemetrix-aio instance
+    :param trigger_pin: Arduino pin number
+    :param echo_pin: Arduino pin number
+    :param callback: The callback function
+    """
+
+    # set the pin mode for the trigger and echo pins
+    await my_board.set_pin_mode_sonar(trigger_pin, echo_pin, callback)
+    # wait forever
+    while True:
+        try:
+            await asyncio.sleep(5)
+            await my_board.sonar_disable()
+            await asyncio.sleep(5)
+            await my_board.sonar_enable()
+
+        except KeyboardInterrupt:
+            await my_board.shutdown()
+            sys.exit(0)
+
+# get the event loop
+loop = asyncio.new_event_loop()
+asyncio.set_event_loop(loop)
+
+# instantiate telemetrix_aio
+board = telemetrix_aio.TelemetrixAIO(ip_address='192.168.2.220')
+
+try:
+    # start the main function
+    loop.run_until_complete(sonar(board, TRIGGER_PIN, ECHO_PIN, the_callback))
+except KeyboardInterrupt:
+    loop.run_until_complete(board.shutdown())
+    sys.exit(0)