diff --git a/esp32/hal/esp32_mphal.h b/esp32/hal/esp32_mphal.h
index 66cd974b1a..f2f62e700c 100644
--- a/esp32/hal/esp32_mphal.h
+++ b/esp32/hal/esp32_mphal.h
@@ -30,4 +30,21 @@ void mp_hal_set_interrupt_char(int c);
 void mp_hal_set_reset_char(int c);
 void mp_hal_reset_safe_and_boot(bool reset);
 
+// https://github.com/micropython/micropython/blob/master/ports/esp32/mphalport.h
+#define mp_hal_quiet_timing_enter() MICROPY_BEGIN_ATOMIC_SECTION()
+#define mp_hal_quiet_timing_exit(irq_state) MICROPY_END_ATOMIC_SECTION(irq_state)
+#define mp_hal_delay_us_fast(us) ets_delay_us(us)
+
+// C-level pin HAL
+#include "py/obj.h"
+#include "machpin.h"
+#define mp_hal_pin_obj_t mp_obj_t
+#define mp_hal_get_pin_obj(pin) (pin)
+#define mp_hal_pin_write(p, v) do { \
+		pin_obj_t *npin = pin_find(p); \
+		npin->value = v; \
+		pin_set_value(npin); \
+	} while (0)
+#define mp_hal_pin_read(p) pin_get_value(pin_find(p))
+
 #endif // _INCLUDED_MPHAL_H_
diff --git a/esp32/mpconfigport.h b/esp32/mpconfigport.h
index 03da7ba524..165b3511ef 100644
--- a/esp32/mpconfigport.h
+++ b/esp32/mpconfigport.h
@@ -191,6 +191,7 @@ extern const struct _mp_obj_module_t mp_module_uhashlib;
 extern const struct _mp_obj_module_t module_ucrypto;
 extern const struct _mp_obj_module_t mp_module_ussl;
 extern const struct _mp_obj_module_t mp_module_uqueue;
+extern const struct _mp_obj_module_t mp_module_onewire;
 
 #define MICROPY_PORT_BUILTIN_MODULES \
     { MP_OBJ_NEW_QSTR(MP_QSTR_umachine),        (mp_obj_t)&machine_module },      \
@@ -206,6 +207,7 @@ extern const struct _mp_obj_module_t mp_module_uqueue;
     { MP_OBJ_NEW_QSTR(MP_QSTR_ussl),            (mp_obj_t)&mp_module_ussl },      \
     { MP_OBJ_NEW_QSTR(MP_QSTR_uerrno),          (mp_obj_t)&mp_module_uerrno },    \
     { MP_OBJ_NEW_QSTR(MP_QSTR_uqueue),          (mp_obj_t)&mp_module_uqueue },    \
+    { MP_OBJ_NEW_QSTR(MP_QSTR__onewire),        (mp_obj_t)&mp_module_onewire },   \
 
 #define MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS \
     { MP_OBJ_NEW_QSTR(MP_QSTR_machine),         (mp_obj_t)&machine_module },      \
diff --git a/py/py.mk b/py/py.mk
index 3d8d849e2b..3a882d2dea 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -287,6 +287,7 @@ PY_EXTMOD_O_BASENAME = \
 	extmod/moduwebsocket.o \
 	extmod/modwebrepl.o \
 	extmod/modframebuf.o \
+	extmod/modonewire.o \
 	extmod/vfs.o \
 	extmod/vfs_reader.o \
 	extmod/vfs_posix.o \