solenoid demo for Pico

Pico_RP2040_Solenoid/pico-solenoid.py

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+# SPDX-FileCopyrightText: 2021 jedgarpark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+# This example uses an MOSFET transistor circuit to drive a solenoid from a Pico RP2040 digitalio pin
+# Hardware setup:
+#   Button on GP3 to gnd (uses internal pull up)
+#   MOSFET driving solenoid on GP14 w protection diode and 47uF capacitor across power rails
+#   external power source should be proper voltage and current for solenoid, not USB power
+
+import time
+import board
+from digitalio import DigitalInOut, Direction, Pull
+
+print("*** Solenoid Demo ***")
+
+led = DigitalInOut(board.LED)  # onboard LED setup
+led.direction = Direction.OUTPUT
+led.value = True
+
+
+def blink(times):
+    for _ in range(times):
+        led.value = False
+        time.sleep(0.1)
+        led.value = True
+        time.sleep(0.1)
+
+
+# Mode button setup
+button = DigitalInOut(board.GP3)
+button.direction = Direction.INPUT
+button.pull = Pull.UP
+
+# Solenoid setup
+solenoid = DigitalInOut(board.GP14)  #  pin drives a MOSFET
+solenoid.direction = Direction.OUTPUT
+solenoid.value = False
+
+strike_time = 0.05  # adjust for coil on time  range ~0.05 - ? (beware heat/power drain beyond a few seconds)
+recover_time = 0.20  # adjust for coil off time/pause between strikes
+
+
+def solenoid_strike(loops):  # solenoid strike function
+    print("solenoid test")
+    for i in range(loops):
+        solenoid.value = True
+        time.sleep(strike_time)
+        solenoid.value = False
+        time.sleep(recover_time)
+        time.sleep(0.1)
+
+
+while True:
+    if not button.value:
+        blink(1)
+        solenoid_strike(4)