adding 8 channel solenoid driver demos

8_Channel_Solenoid_Driver/Arduino_Solenoid_Driver/Arduino_Solenoid_Driver.ino

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+// SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Adafruit_MCP23X17.h>
+
+#define NOID_1 0     // MCP23XXX pin LED is attached to
+#define NOID_2 4     // MCP23XXX pin LED is attached to
+
+Adafruit_MCP23X17 mcp;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println("8 Channel Solenoid Driver Demo");
+  if (!mcp.begin_I2C()) {
+    Serial.println("Couldn't find MCP23017..");
+    while (1);
+  }
+  mcp.pinMode(NOID_1, OUTPUT);
+  mcp.pinMode(NOID_2, OUTPUT);
+
+  Serial.println("Found MCP23017, looping...");
+}
+
+void loop() {
+  Serial.println("Solenoid 1!");
+  mcp.digitalWrite(NOID_1, HIGH);
+  delay(500);
+  mcp.digitalWrite(NOID_1, LOW);
+  delay(500);
+  Serial.println("Solenoid 2!");
+  mcp.digitalWrite(NOID_2, HIGH);
+  delay(500);
+  mcp.digitalWrite(NOID_2, LOW);
+  delay(500);
+  Serial.println("Together!");
+  mcp.digitalWrite(NOID_1, HIGH);
+  mcp.digitalWrite(NOID_2, HIGH);
+  delay(1000);
+  mcp.digitalWrite(NOID_1, LOW);
+  mcp.digitalWrite(NOID_2, LOW);
+  delay(2000);
+  Serial.println("Repeat!");
+  Serial.println();
+  delay(500);
+}

8_Channel_Solenoid_Driver/CircuitPython/code.py

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+# SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from adafruit_mcp230xx.mcp23017 import MCP23017
+
+i2c = board.STEMMA_I2C()
+
+mcp = MCP23017(i2c)
+
+noid_1 = mcp.get_pin(0)
+noid_2 = mcp.get_pin(4)
+noid_1.switch_to_output(value=False)
+noid_2.switch_to_output(value=False)
+
+while True:
+    noid_1.value = True
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(0.2)
+    noid_1.value = False
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(0.2)
+    noid_2.value = True
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(0.2)
+    noid_2.value = False
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(1)
+    noid_1.value = True
+    noid_2.value = True
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(1)
+    noid_1.value = False
+    noid_2.value = False
+    print(f"Solenoid 1: {noid_1.value}, Solenoid 2: {noid_2.value}")
+    time.sleep(2)