code for BLE RS232 controller

CircuitPython code for the ESP32-S3 BLE RS232 controller

BLE_RS232_Controller/code.py

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+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import busio
+from adafruit_bluefruit_connect.packet import Packet
+from adafruit_bluefruit_connect.button_packet import ButtonPacket
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+import neopixel
+
+# baud rate for your device
+baud = 38400
+# commands for your device
+commands = ["AVI=1", "AVI=2", "AVI=3", "AVI=4"]
+# Initialize UART for the RS232
+uart = busio.UART(board.TX, board.RX, baudrate=baud)
+# onboard neopixel
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.5, auto_write=True)
+RED = (255, 0, 0)
+BLUE = (0, 0, 255)
+#  BLE setup
+ble = BLERadio()
+ble_uart = UARTService()
+advertisement = ProvideServicesAdvertisement(ble_uart)
+advertising = False
+print("advertising..")
+while True:
+    if not ble.connected and not advertising:
+        #  not connected in the app yet
+        pixels.fill(RED)
+        ble.start_advertising(advertisement)
+        advertising = True
+
+    while ble.connected:
+        pixels.fill(BLUE)
+        # after connected via app
+        advertising = False
+        if ble_uart.in_waiting:
+            #  waiting for input from app
+            packet = Packet.from_stream(ble_uart)
+            if isinstance(packet, ButtonPacket):
+                #  if buttons in the app are pressed
+                if packet.pressed:
+                    if packet.button == ButtonPacket.BUTTON_1:
+                        uart.write((commands[0] + "\r\n").encode('ascii'))
+                    if packet.button == ButtonPacket.BUTTON_2:
+                        uart.write((commands[1] + "\r\n").encode('ascii'))
+                    if packet.button == ButtonPacket.BUTTON_3:
+                        uart.write((commands[2] + "\r\n").encode('ascii'))
+                    if packet.button == ButtonPacket.BUTTON_4:
+                        uart.write((commands[3] + "\r\n").encode('ascii'))
+        # empty buffer to collect the incoming data
+        response_buffer = bytearray()
+        # check for data
+        time.sleep(1)
+        while uart.in_waiting:
+            data = uart.read(uart.in_waiting)
+            if data:
+                response_buffer.extend(data)
+        # decode and print
+        if response_buffer:
+            print(response_buffer.decode('ascii'), end='')
+            print()