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Author: alankrantas

TTP229_BSF.py

@@ -0,0 +1,44 @@
+# MicroPython driver for TTP229-BSF 16-key capacitive keypad in serial interface mode
+# by Alan Wang
+
+from machine import Pin
+import utime
+
+class Keypad:
+    
+    def __init__(self, scl, sdo, inputs=8, multi=False, raw=False):
+        self._scl_pin = scl
+        self._sdo_pin = sdo
+        self._inputs = inputs
+        self._multi_mode = multi
+        self._raw_mode = raw
+    
+    def read(self):
+        key = []
+        for i in range(self._inputs):
+            key.append(1)
+        self._scl_pin.on()
+        utime.sleep_ms(1)
+        for i in range(self._inputs):
+            self._scl_pin.off()
+            utime.sleep_ms(1)
+            key[i] = self._sdo_pin.value()
+            self._scl_pin.on()
+            utime.sleep_ms(1)
+        utime.sleep_ms(1)
+        if self._raw_mode:
+            return key
+        else:
+            if self._multi_mode:
+                key_multi = []
+                for i in range(self._inputs):
+                    if key[i] == 0:
+                        key_multi.append(i)
+                return key_multi
+            else:
+                key_single = -1
+                for i in range(self._inputs):
+                    if key[i] == 0:
+                        key_single = i
+                        break
+                return key_single