Updated plasma mp examples to use user_sw and current sensing

micropython/examples/plasma_2040/rainbow.py

@@ -1,19 +1,34 @@
 import plasma
 import time
 
+# Import helper for Analog
+from pimoroni import Analog
+
 NUM_LEDS = 30
+UPDATES = 60
 
 # WS2812 / NeoPixel™ LEDs
 led_strip = plasma.WS2812(NUM_LEDS, 0, 0, 15)
 # APA102 / DotStar™ LEDs
-# led_strip = plasma.APA102(NUM_LEDS, 0, 0, 15, 14)
+#led_strip = plasma.APA102(NUM_LEDS, 0, 0, 15, 14)
+
+# Set up the ADC for reading current
+sense = Analog(plasma.PIN_CURRENT_SENSE, plasma.ADC_GAIN, plasma.SHUNT_RESISTOR)
 
 # Start updating the LED strip
 led_strip.start()
 
+count = 0
 # Make rainbows
 while True:
     t = time.ticks_ms() / 1000.0 / 5.0
     for i in range(NUM_LEDS):
         led_strip.set_hsv(i, t + (i / NUM_LEDS))
-    time.sleep(1.0 / 60)
+
+    count += 1
+    if count >= UPDATES:
+        # Display the current value once every second
+        print("Current =", sense.read_current(), "A")
+        count = 0
+    
+    time.sleep(1.0 / UPDATES)

micropython/examples/plasma_2040/rgb-led-and-buttons.py

@@ -1,18 +1,22 @@
 import time
 
 # Import pin constants from plasma
-from plasma import PIN_LED_R, PIN_LED_G, PIN_LED_B, PIN_BUTTON_A, PIN_BUTTON_B
+from plasma import PIN_LED_R, PIN_LED_G, PIN_LED_B, PIN_USER_SW, PIN_BUTTON_A, PIN_BUTTON_B
 
 # Import helpers for RGB LEDs and Buttons
 from pimoroni import RGBLED, Button
 
 led = RGBLED(PIN_LED_R, PIN_LED_G, PIN_LED_B)
-led.set_rgb(255, 0, 0)
+led.set_rgb(0, 0, 0)
 
+user_sw = Button(PIN_USER_SW)
 button_a = Button(PIN_BUTTON_A)
 button_b = Button(PIN_BUTTON_B)
 
 while True:
+    if user_sw.read():
+        print("Pressed User SW - {}".format(time.ticks_ms()))
+        led.set_rgb(255, 0, 0)
     if button_a.read():
         print("Pressed A - {}".format(time.ticks_ms()))
         led.set_rgb(0, 255, 0)