diff --git a/src/DataVisualizerDashboardSignal.cpp b/src/DataVisualizerDashboardSignal.cpp
index 211ed85..aefafb9 100644
--- a/src/DataVisualizerDashboardSignal.cpp
+++ b/src/DataVisualizerDashboardSignal.cpp
@@ -9,12 +9,14 @@ void DataVisualizerDashboardSignal::on(void) {
   if (!this->visualizer) return;
   if (!this->visualizer->handshake) return;
 
-  this->visualizer->write(this->id, (uint8_t*) true, 1);
+  uint8_t value = 1;
+  this->visualizer->write(this->id, &value, 1);
 }
 
 void DataVisualizerDashboardSignal::off(void) {
   if (!this->visualizer) return;
   if (!this->visualizer->handshake) return;
 
-  this->visualizer->write(this->id, (uint8_t*) false, 1);
+  uint8_t value = 0;
+  this->visualizer->write(this->id, &value, 1);
 }
\ No newline at end of file