diff --git a/include/mgos_arduino_dallas_temp.h b/include/mgos_arduino_dallas_temp.h
index d4f6171..05ed6e1 100644
--- a/include/mgos_arduino_dallas_temp.h
+++ b/include/mgos_arduino_dallas_temp.h
@@ -29,6 +29,9 @@ typedef struct DallasTemperatureTag DallasTemperature;
 extern "C" {
 #endif
 
+// Auto-created, config-controlled singleton.  NULL if disabled.
+DallasTemperature *mgos_ds18x_get_global();
+
 // Initialize DallasTemperature driver.
 // Return value: handle opaque pointer.
 DallasTemperature *mgos_arduino_dt_create(OneWire *ow);
diff --git a/mos.yml b/mos.yml
index 26f0ab0..626ba49 100644
--- a/mos.yml
+++ b/mos.yml
@@ -20,6 +20,10 @@ libs:
   - origin: https://github.com/mongoose-os-libs/arduino-compat
   - origin: https://github.com/mongoose-os-libs/arduino-onewire
 
+config_schema:
+  - ["ds18x", "o", {"title":"DTCL (Dallas Temperature Control Library) settings"}]
+  - ["ds18x.pin", "i", -1, {"title": "GPIO for 1-wire link; -1 disables DTCL singleton"}]
+
 tags:
   - arduino
   - c
diff --git a/src/mgos_arduino_dallas_temp_c.c b/src/mgos_arduino_dallas_temp_c.c
index bfd7202..55398e2 100644
--- a/src/mgos_arduino_dallas_temp_c.c
+++ b/src/mgos_arduino_dallas_temp_c.c
@@ -1,5 +1,18 @@
 #include <stdbool.h>
 
+#include <mgos_config.h>
+
+#include <mgos_arduino_dallas_temp.h>
+
+static DallasTemperature *s_global_mgos_ds18x = NULL;
+DallasTemperature *mgos_ds18x_get_global() {
+  return s_global_mgos_ds18x;
+}
+
 bool mgos_arduino_dallas_temperature_init(void) {
+  int pin = mgos_sys_config_get_ds18x_pin();
+  if (pin < 0) return true;
+  s_global_mgos_ds18x = mgos_arduino_dt_create(mgos_arduino_onewire_create(pin));
+  mgos_arduino_dt_begin(s_global_mgos_ds18x);
   return true;
 }