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diff --git a/shared-bindings/_bleio/Scanner.c b/shared-bindings/_bleio/Scanner.c
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+++ b/shared-bindings/_bleio/Scanner.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Dan Halbert for Adafruit Industries
+ * Copyright (c) 2018 Artur Pacholec
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/_bleio/ScanEntry.h"
+#include "shared-bindings/_bleio/Scanner.h"
+
+#define INTERVAL_DEFAULT (0.1f)
+#define INTERVAL_MIN (0.0025f)
+#define INTERVAL_MIN_STRING "0.0025"
+#define INTERVAL_MAX (40.959375f)
+#define INTERVAL_MAX_STRING "40.959375"
+#define WINDOW_DEFAULT (0.1f)
+
+//| .. currentmodule:: _bleio
+//|
+//| :class:`Scanner` -- scan for nearby BLE devices
+//| =========================================================
+//|
+//| Scan for nearby BLE devices.
+//|
+//| Usage::
+//|
+//|    import _bleio
+//|    scanner = _bleio.Scanner()
+//|    entries = scanner.scan(2.5)  # Scan for 2.5 seconds
+//|
+
+//| .. class:: Scanner()
+//|
+//|   Create a new Scanner object.
+//|
+STATIC mp_obj_t bleio_scanner_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *all_args, mp_map_t *kw_args) {
+    mp_arg_check_num(n_args, kw_args, 0, 0, false);
+
+    bleio_scanner_obj_t *self = m_new_obj(bleio_scanner_obj_t);
+    self->base.type = type;
+
+    common_hal_bleio_scanner_construct(self);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: scan(timeout, \*, interval=0.1, window=0.1)
+//|
+//|     Performs a BLE scan.
+//|
+//|     :param float timeout: the scan timeout in seconds
+//|     :param float interval: the interval (in seconds) between the start of two consecutive scan windows
+//|        Must be in the range 0.0025 - 40.959375 seconds.
+//|     :param float window: the duration (in seconds) to scan a single BLE channel.
+//|        window must be <= interval.
+//|     :returns: an iterable of `ScanEntry` objects
+//|     :rtype: iterable
+//|
+STATIC mp_obj_t bleio_scanner_scan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_timeout, ARG_interval, ARG_window };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_timeout,  MP_ARG_REQUIRED | MP_ARG_OBJ },
+        { MP_QSTR_interval, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_window,   MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+    };
+
+    bleio_scanner_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    const mp_float_t timeout = mp_obj_get_float(args[ARG_timeout].u_obj);
+
+    if (args[ARG_interval].u_obj == MP_OBJ_NULL) {
+        args[ARG_interval].u_obj = mp_obj_new_float(INTERVAL_DEFAULT);
+    }
+
+    if (args[ARG_window].u_obj == MP_OBJ_NULL) {
+        args[ARG_window].u_obj = mp_obj_new_float(WINDOW_DEFAULT);
+    }
+
+    const mp_float_t interval = mp_obj_float_get(args[ARG_interval].u_obj);
+    if (interval < INTERVAL_MIN || interval > INTERVAL_MAX) {
+        mp_raise_ValueError_varg(translate("interval must be in range %s-%s"), INTERVAL_MIN_STRING, INTERVAL_MAX_STRING);
+    }
+
+    const mp_float_t window = mp_obj_float_get(args[ARG_window].u_obj);
+    if (window > interval) {
+        mp_raise_ValueError(translate("window must be <= interval"));
+    }
+
+    return common_hal_bleio_scanner_scan(self, timeout, interval, window);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bleio_scanner_scan_obj, 2, bleio_scanner_scan);
+
+
+STATIC const mp_rom_map_elem_t bleio_scanner_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_scan), MP_ROM_PTR(&bleio_scanner_scan_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(bleio_scanner_locals_dict, bleio_scanner_locals_dict_table);
+
+const mp_obj_type_t bleio_scanner_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Scanner,
+    .make_new = bleio_scanner_make_new,
+    .locals_dict = (mp_obj_dict_t*)&bleio_scanner_locals_dict
+};