diff --git a/controller/controller.c b/controller/controller.c
index df37a9b..e9d1940 100644
--- a/controller/controller.c
+++ b/controller/controller.c
@@ -125,7 +125,6 @@ int main() {
   }
 
   while (1) {
-    int numDevices = sizeof(devices) / sizeof(struct device);
     for (int i = 0; i < numDevices; i++) {
       setI2CAddress(devices[i].address);
       i2cResponse = i2c_smbus_read_byte_data(i2c, 0);
@@ -139,10 +138,13 @@ int main() {
         sendI2CInit(devices[i]);
       } else if (i2cResponse == DATA_STOP_BYTE) {
         // expect no forther data from device
+        usleep(50 * 1000);
         continue;
       } else {
         // real data
         _log("data: 0x%02x\n", i2cResponse);
+        /*
+        XXX: put data into cache and handle with another core / loop / fork / whatever
         if (i2cResponse & TRIGGER_BIT_1) {
           if (i2cResponse & HIGH_BIT_1) {
             sendI2CData(devices[i], TRIGGER_BIT_1, "+1+", 3);
@@ -158,9 +160,9 @@ int main() {
             sendI2CData(devices[i], TRIGGER_BIT_2, "-2-", 3);
           }
         }
+        */
       }
     }
-    usleep(10 * 1000);
   }
 
   close(i2c);