Add IMU app

2026-05-20 11:51:27 -07:00 · 2025-06-26 09:49:30 +02:00
parent f8676c8dbc
commit 4d4e8361ff
3 changed files with 119 additions and 0 deletions
@@ -0,0 +1,24 @@
+{
+"name": "IMU",
+"publisher": "MicroPythonOS",
+"short_description": "Inertial Measurement Unit Visualization",
+"long_description": "Visualize data from the Intertial Measurement Unit, also known as the accellerometer.",
+"icon_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/icons/com.micropythonos.imu.0.0.1_64x64.png",
+"download_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/mpks/com.micropythonos.mu.0.0.1.mpk",
+"fullname": "com.micropythonos.imu",
+"version": "0.0.1",
+"category": "hardware",
+"activities": [
+    {
+      "entrypoint": "assets/imu.py",
+      "classname": "IMU",
+      "intent_filters": [
+        {
+          "action": "main",
+          "category": "launcher"
+        }
+      ]
+    }
+  ]
+}
+
@@ -0,0 +1,95 @@
+from mpos.apps import Activity
+
+class IMU(Activity):
+
+    sensor = None
+    refresh_timer = None
+
+    # widgets:
+    sliderx = None
+    slidery = None
+    sliderz = None
+    slidergx = None
+    slidergy = None
+    slidergz = None
+
+    def onCreate(self):
+        screen = lv.obj()
+        self.templabel = lv.label(screen)
+        self.templabel.align(lv.ALIGN.TOP_MID, 0, 10)
+        self.sliderx = lv.slider(screen)
+        self.sliderx.align(lv.ALIGN.CENTER, 0, -60)
+        self.slidery = lv.slider(screen)
+        self.slidery.align(lv.ALIGN.CENTER, 0, -30)
+        self.sliderz = lv.slider(screen)
+        self.sliderz.align(lv.ALIGN.CENTER, 0, 0)
+        self.slidergx = lv.slider(screen)
+        self.slidergx.align(lv.ALIGN.CENTER, 0, 30)
+        self.slidergy = lv.slider(screen)
+        self.slidergy.align(lv.ALIGN.CENTER, 0, 60)
+        self.slidergz = lv.slider(screen)
+        self.slidergz.align(lv.ALIGN.CENTER, 0, 90)
+        try:
+            from machine import Pin, I2C
+            from qmi8658 import QMI8658
+            import machine
+            self.sensor = QMI8658(I2C(0, sda=machine.Pin(48), scl=machine.Pin(47)))
+        except Exception as e:
+            warning = f"Warning: could not initialize IMU hardware:\n{e}"
+            print(warning)
+            self.templabel.set_text(warning)
+        self.setContentView(screen)
+
+        def onStart(self, screen):
+            self.refresh_timer = lv.timer_create(self.refresh, 100, None)
+
+        def onStop(self, screen):
+            if self.refresh_timer:
+                self.refresh_timer.delete()
+
+
+    def map_nonlinear(self, value: float) -> int:
+        # Preserve sign and work with absolute value
+        sign = 1 if value >= 0 else -1
+        abs_value = abs(value)
+        # Apply non-linear transformation (square root) to absolute value
+        # Scale input range [0, 200] to [0, sqrt(200)] first
+        sqrt_value = (abs_value ** 0.5)
+        # Scale to output range [0, 100]
+        # Map [0, sqrt(200)] to [50, 100] for positive, [0, 50] for negative
+        max_sqrt = 200.0 ** 0.5  # Approx 14.142
+        scaled = (sqrt_value / max_sqrt) * 50.0  # Scale to [0, 50]
+        return int(50.0 + (sign * scaled))  # Shift to [0, 100]
+    
+    def refresh(self, timer):
+        if self.sensor:
+            #print(f"""{sensor.temperature=} {sensor.acceleration=} {sensor.gyro=}""")
+            temp = self.sensor.temperature
+            ax = self.sensor.acceleration[0]
+            axp = int((ax * 100 + 100)/2)
+            ay = self.sensor.acceleration[1]
+            ayp = int((ay * 100 + 100)/2)
+            az = self.sensor.acceleration[2]
+            azp = int((az * 100 + 100)/2)
+            # values between -200 and 200 => /4 becomes -50 and 50 => +50 becomes 0 and 100
+            gx = self.map_nonlinear(self.sensor.gyro[0])
+            gy = self.map_nonlinear(self.sensor.gyro[1])
+            gz = self.map_nonlinear(self.sensor.gyro[2])
+            self.templabel.set_text(f"IMU chip temperature: {temp:.2f}°C")
+        else:
+            #temp = 12.34
+            import random
+            randomnr = random.randint(0,100)
+            axp = randomnr
+            ayp = 50
+            azp = 75
+            gx = 45
+            gy = 50
+            gz = 55
+        self.sliderx.set_value(axp, lv.ANIM.OFF)
+        self.slidery.set_value(ayp, lv.ANIM.OFF)
+        self.sliderz.set_value(azp, lv.ANIM.OFF)
+        self.slidergx.set_value(gx, lv.ANIM.OFF)
+        self.slidergy.set_value(gy, lv.ANIM.OFF)
+        self.slidergz.set_value(gz, lv.ANIM.OFF)
+