adding Arduino and CP examples for ADG72x

ADG72x_Examples/Arduino_ADG72x_Plotter/Arduino_ADG72x_Plotter.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Adafruit_ADG72x.h>
+
+Adafruit_ADG72x adg72x;
+
+bool isADG728 = false; // which chip are we connected to?
+
+int analogIn = A0;
+int analogValue = 0;
+unsigned long timer = 2000;
+unsigned long startTime = millis();
+
+void setup() {
+  Serial.begin(115200);
+
+  // Wait for serial port to open
+  while (!Serial) {
+    delay(1);
+  }
+
+  // Try with the ADG728 default address first...
+  if (adg72x.begin(ADG728_DEFAULT_ADDR, &Wire)) {
+    Serial.println("ADG728 found!");
+    isADG728 = true;
+  }
+  // Maybe they have an ADG729?
+  else if (adg72x.begin(ADG729_DEFAULT_ADDR, &Wire)) {
+    Serial.println("ADG729 found!");
+    isADG728 = false;
+  }
+  else {
+    Serial.println("No ADG device found? Check wiring!");
+    while (1); // Stop here if no device was found
+  }
+}
+
+void loop() {
+  analogValue = analogRead(analogIn);
+  Serial.println(analogValue);
+
+  if ((millis() - startTime) >= timer) {
+  for (uint8_t i = 0; i < 8; i++) {
+    if (isADG728) {
+    } else {
+      if (i < 4) Serial.println("A");
+      else       Serial.println("B");
+    }
+    uint8_t bits = 1 << i; // Shift a '1' from LSB to MSB
+    if (!adg72x.selectChannels(bits)) {
+    }
+    startTime = millis();
+  }
+  }
+  delay(10);
+}

ADG72x_Examples/CircuitPython/code.py

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+# SPDX-FileCopyrightText: Copyright (c) 2024 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import adafruit_adg72x
+from analogio import AnalogIn
+
+analog_in = AnalogIn(board.A0)
+
+i2c = board.I2C()
+switch = adafruit_adg72x.ADG72x(i2c)
+
+c = 0
+switch_time = 2
+clock = time.monotonic()
+while True:
+    if (time.monotonic() - clock) > switch_time:
+        print(f"Selecting channel {c + 1}")
+        switch.channel = c
+        c = (c + 1) % 8
+        clock = time.monotonic()
+    print((analog_in.value,))
+    time.sleep(0.1)