diff --git a/drivers/dht/dht.c b/drivers/dht/dht.c
index 5d92ae39a..96f48a538 100644
--- a/drivers/dht/dht.c
+++ b/drivers/dht/dht.c
@@ -1,3 +1,4 @@
+#ifdef MICROPY_HW_ENABLE_DHT
 /*
  * This file is part of the MicroPython project, http://micropython.org/
  *
@@ -87,3 +88,5 @@ timeout:
     mp_raise_OSError(MP_ETIMEDOUT);
 }
 MP_DEFINE_CONST_FUN_OBJ_2(dht_readinto_obj, dht_readinto);
+
+#endif
diff --git a/ports/stm32/modmachine.c b/ports/stm32/modmachine.c
index 158f5f2b3..b9ebc56bf 100644
--- a/ports/stm32/modmachine.c
+++ b/ports/stm32/modmachine.c
@@ -630,7 +630,9 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_disable_irq),         MP_ROM_PTR(&pyb_disable_irq_obj) },
     { MP_ROM_QSTR(MP_QSTR_enable_irq),          MP_ROM_PTR(&pyb_enable_irq_obj) },
 
+#if MICROPY_PY_MACHINE_PULSE
     { MP_ROM_QSTR(MP_QSTR_time_pulse_us),       MP_ROM_PTR(&machine_time_pulse_us_obj) },
+#endif
 
     { MP_ROM_QSTR(MP_QSTR_mem8),                MP_ROM_PTR(&machine_mem8_obj) },
     { MP_ROM_QSTR(MP_QSTR_mem16),               MP_ROM_PTR(&machine_mem16_obj) },
diff --git a/ports/stm32/modpyb.c b/ports/stm32/modpyb.c
index 5afbbc484..8681b5755 100644
--- a/ports/stm32/modpyb.c
+++ b/ports/stm32/modpyb.c
@@ -30,7 +30,9 @@
 #include "py/runtime.h"
 #include "py/mphal.h"
 #include "lib/utils/pyexec.h"
+#if MICROPY_HW_ENABLE_DHT
 #include "drivers/dht/dht.h"
+#endif
 #include "stm32_it.h"
 #include "irq.h"
 #include "led.h"
@@ -164,8 +166,10 @@ STATIC const mp_rom_map_elem_t pyb_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&mp_vfs_mount_obj) },
     #endif
 
+#if MICROPY_HW_ENABLE_DHT
     // This function is not intended to be public and may be moved elsewhere
     { MP_ROM_QSTR(MP_QSTR_dht_readinto), MP_ROM_PTR(&dht_readinto_obj) },
+#endif
 
     { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&pyb_timer_type) },
 
diff --git a/ports/stm32/mpconfigboard_common.h b/ports/stm32/mpconfigboard_common.h
index 5316113cc..2d70f3d20 100644
--- a/ports/stm32/mpconfigboard_common.h
+++ b/ports/stm32/mpconfigboard_common.h
@@ -224,3 +224,9 @@
 #endif
 
 #define MICROPY_HW_USES_BOOTLOADER (MICROPY_HW_VTOR != 0x08000000)
+
+// drivers/dht ... a specific enviro sensor of some sort
+#ifndef MICROPY_HW_ENABLE_DHT
+#define MICROPY_HW_ENABLE_DHT        (1)
+#endif
+