MPR121 touch detection

python/samples/touch.py

@@ -0,0 +1,33 @@
+"""
+Example for MPR121 Capacitive Touch Sensor.
+Available from multiple vendors.
+"""
+
+import sys
+import serial
+import time
+import struct
+import random
+
+from i2cdriver import I2CDriver
+
+class MPR121:
+    def __init__(self, i2, a = 0x5a):
+        self.i2 = i2
+        self.a = a
+        self.i2.regwr(self.a, 0x5e, 0x0c)
+
+    def read(self):
+        """ Return 12 touch detection flags """
+        (tb,) = struct.unpack("<H", self.i2.regrd(0x5a, 0, 2))
+        return [((tb >> i) & 1) for i in range(12)]
+
+if __name__ == '__main__':
+    i2 = I2CDriver(sys.argv[1])
+
+    i2.reset()
+
+    d = MPR121(i2)
+    while 1:
+        print(d.read())
+        time.sleep(.1)