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diff --git a/shared-bindings/busio/OneWire.c b/shared-bindings/busio/OneWire.c
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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 <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/runtime0.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/busio/OneWire.h"
+
+//| .. currentmodule:: busio
+//|
+//| :class:`OneWire` -- Lowest-level of the Maxim OneWire protocol
+//| =================================================================
+//|
+//| :class:`~busio.OneWire` implements the timing-sensitive foundation of the Maxim
+//| (formerly Dallas Semi) OneWire protocol.
+//|
+//| Protocol definition is here: https://www.maximintegrated.com/en/app-notes/index.mvp/id/126
+//|
+//| .. class:: OneWire(pin)
+//|
+//|   Create a OneWire object associated with the given pin. The object
+//|   implements the lowest level timing-sensitive bits of the protocol.
+//|
+//|   :param ~microcontroller.Pin pin: Pin connected to the OneWire bus
+//|
+//|   Read a short series of pulses::
+//|
+//|     import busio
+//|     import board
+//|
+//|     with busio.OneWire(board.D7) as onewire:
+//|       onewire.reset()
+//|       onewire.write_bit(True)
+//|       onewire.write_bit(False)
+//|       print(onewire.read_bit())
+//|
+STATIC mp_obj_t busio_onewire_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) {
+    mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
+    mp_map_t kw_args;
+    mp_map_init_fixed_table(&kw_args, n_kw, pos_args + n_args);
+    enum { ARG_pin };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+    assert_pin(args[ARG_pin].u_obj, false);
+    const mcu_pin_obj_t* pin = MP_OBJ_TO_PTR(args[ARG_pin].u_obj);
+    assert_pin_free(pin);
+
+    busio_onewire_obj_t *self = m_new_obj(busio_onewire_obj_t);
+    self->base.type = &busio_onewire_type;
+
+    common_hal_busio_onewire_construct(self, pin);
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialize the OneWire bus and release any hardware resources for reuse.
+//|
+STATIC mp_obj_t busio_onewire_deinit(mp_obj_t self_in) {
+    busio_onewire_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_busio_onewire_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(busio_onewire_deinit_obj, busio_onewire_deinit);
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context.
+//|
+STATIC mp_obj_t busio_onewire_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_busio_onewire_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(busio_onewire___exit___obj, 4, 4, busio_onewire_obj___exit__);
+
+//|   .. method:: reset()
+//|
+//|     Reset the OneWire bus and read presence
+//|
+//|     :returns: False when at least one device is present
+//|     :rtype: bool
+//|
+STATIC mp_obj_t busio_onewire_obj_reset(mp_obj_t self_in) {
+    busio_onewire_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    return mp_obj_new_bool(common_hal_busio_onewire_reset(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(busio_onewire_reset_obj, busio_onewire_obj_reset);
+
+//|   .. method:: read_bit()
+//|
+//|     Read in a bit
+//|
+//|     :returns: bit state read
+//|     :rtype: bool
+//|
+STATIC mp_obj_t busio_onewire_obj_read_bit(mp_obj_t self_in) {
+    busio_onewire_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    return mp_obj_new_bool(common_hal_busio_onewire_read_bit(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(busio_onewire_read_bit_obj, busio_onewire_obj_read_bit);
+
+//|   .. method:: write_bit(value)
+//|
+//|     Write out a bit based on value.
+//|
+STATIC mp_obj_t busio_onewire_obj_write_bit(mp_obj_t self_in, mp_obj_t bool_obj) {
+    busio_onewire_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    common_hal_busio_onewire_write_bit(self, mp_obj_is_true(bool_obj));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(busio_onewire_write_bit_obj, busio_onewire_obj_write_bit);
+
+STATIC const mp_rom_map_elem_t busio_onewire_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&busio_onewire_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&busio_onewire___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&busio_onewire_reset_obj) },
+    { MP_ROM_QSTR(MP_QSTR_read_bit), MP_ROM_PTR(&busio_onewire_read_bit_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write_bit), MP_ROM_PTR(&busio_onewire_write_bit_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(busio_onewire_locals_dict, busio_onewire_locals_dict_table);
+
+const mp_obj_type_t busio_onewire_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_OneWire,
+    .make_new = busio_onewire_make_new,
+    .locals_dict = (mp_obj_dict_t*)&busio_onewire_locals_dict,
+};