simple soil sensor examples

adding micropython and arduino examples for simple soil sensor

Simple_Soil_Sensor_Demos/Arduino/microBitAdvSoilSensor/microBitAdvSoilSensor.ino

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+// SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/* micro:bit Advanced Soil Sensor Demo */
+
+#include <Adafruit_Microbit.h>
+
+Adafruit_Microbit_Matrix microbit;
+
+int sensorPin = 0;
+int onPin = 2;
+int moisture = 0;
+
+const uint8_t
+  frown_bmp[] =
+  { B00000,
+    B01010,
+    B00000,
+    B01110,
+    B10001, };
+const uint8_t
+  smile_bmp[] =
+  { B00000,
+    B01010,
+    B00000,
+    B10001,
+    B01110, };
+
+void setup() {
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);
+  Serial.println("micro:bit advanced soil sensor");
+  microbit.begin();
+  pinMode(onPin, OUTPUT);
+
+}
+
+void loop() {
+  digitalWrite(onPin, HIGH);
+  delay(50);
+  // read the value from the sensor:
+  moisture = analogRead(sensorPin);
+  Serial.print("Soil moisture: ");
+  Serial.println(moisture);
+  if (moisture > 200) {
+    microbit.show(smile_bmp);
+  } else {
+    microbit.show(frown_bmp);
+  }
+  digitalWrite(onPin, LOW);
+  delay(5000);
+}

Simple_Soil_Sensor_Demos/Arduino/microBitSimpleSoilSensor/microBitSimpleSoilSensor.ino

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+// SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/* micro:bit Simple Soil Sensor Demo */
+
+#include <Adafruit_Microbit.h>
+
+Adafruit_Microbit_Matrix microbit;
+
+int sensorPin = 0;
+int moisture = 0;
+
+const uint8_t
+  frown_bmp[] =
+  { B00000,
+    B01010,
+    B00000,
+    B01110,
+    B10001, };
+const uint8_t
+  smile_bmp[] =
+  { B00000,
+    B01010,
+    B00000,
+    B10001,
+    B01110, };
+
+void setup() {
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);
+  Serial.println("micro:bit simple soil sensor");
+  microbit.begin();
+
+}
+
+void loop() {
+  // read the value from the sensor:
+  moisture = analogRead(sensorPin);
+  Serial.print("Soil moisture: ");
+  Serial.println(moisture);
+  if (moisture > 200) {
+    microbit.show(smile_bmp);
+  } else {
+    microbit.show(frown_bmp);
+  }
+  delay(5000);
+}

Simple_Soil_Sensor_Demos/MicroPython/adv_soil_sensor_demo.py

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+# SPDX-FileCopyrightText: Copyright (c) 2025 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+# pylint: disable=wildcard-import, undefined-variable
+
+"""MicroPython Advanced Soil Sensing Demo for micro:bit"""
+from microbit import *
+
+while True:
+    pin2.write_digital(1)
+    sleep(100)
+    moisture = pin0.read_analog()
+    if moisture > 200:
+        display.show(Image.HAPPY)
+    else:
+        display.show(Image.SAD)
+    pin2.write_digital(0)
+    sleep(5000)

Simple_Soil_Sensor_Demos/MicroPython/simple_soil_sensor_demo.py

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+# SPDX-FileCopyrightText: Copyright (c) 2025 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+# pylint: disable=wildcard-import, undefined-variable
+
+"""MicroPython Simple Soil Sensing Demo for micro:bit"""
+from microbit import *
+
+while True:
+    moisture = pin0.read_analog()
+    if moisture > 200:
+        display.show(Image.HAPPY)
+    else:
+        display.show(Image.SAD)
+    sleep(5000)