diff --git a/README.md b/README.md
index 909bd3d..4e2231d 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,13 @@
 # DS248x serial bridge
 
 [![Framework Badge Arduino](https://img.shields.io/badge/framework-arduino-00979C.svg)](https://arduino.cc)
+[![build](https://github.com/pilotak/ds248x-serial-bridge/actions/workflows/build.yml/badge.svg)](https://github.com/pilotak/ds248x-serial-bridge/actions/workflows/build.yml)
 
 Simple FW for reading Dallas temperature sensors via DS248x with output as JSON
 
 Output example
 ```
-{"0x28FF5A1A31180210":23.06,"0x28FF9725311801EE":23.12}
+{"0x28FF5A1A31180210": 23.06, "0x28FF9725311801EE":23.12}
 ```
 
 > All credits for DS2482 library goes to https://github.com/cybergibbons/DS2482_OneWire/
\ No newline at end of file
diff --git a/platformio.ini b/platformio.ini
index 649f25a..5992863 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -13,6 +13,7 @@ board_hardware.oscillator = internal
 board_hardware.bod = 4.3v
 build_flags =
   ${common.build_flags}
+  '-D NO_CHANNELS=4'
 lib_deps =
   ${common.lib_deps}
 
@@ -24,5 +25,6 @@ framework = arduino
 monitor_speed = 115200
 build_flags =
   ${common.build_flags}
+  '-D NO_CHANNELS=1'
 lib_deps =
   ${common.lib_deps}
diff --git a/src/main.cpp b/src/main.cpp
index 627c480..a69276f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,8 +8,9 @@ uint8_t data[9] = {0};
 
 void (*resetFunc)(void) = 0;
 
-void printAddress(uint8_t deviceAddress[]) {
+void print(uint8_t deviceAddress[], float temp) {
   Serial.print(F("\"0x"));
+
   for (uint8_t i = 0; i < 8; i++) {
     // zero pad the address
     if (deviceAddress[i] < 16) {
@@ -17,7 +18,9 @@ void printAddress(uint8_t deviceAddress[]) {
     }
     Serial.print(deviceAddress[i], HEX);
   }
-  Serial.print(F("\""));
+
+  Serial.print(F("\": "));
+  Serial.print(temp, 2);
 }
 
 void checkPresence() {
@@ -41,7 +44,7 @@ void loop() {
   Serial.print("{");
   bool first = true;
 
-  for (int i = 0; i < 1; i++) {
+  for (int i = 0; i < NO_CHANNELS; i++) {
     oneWire.setChannel(i);
 
     if (!oneWire.reset()) {
@@ -101,16 +104,14 @@ void loop() {
           break;
       }
 
-      // output data
+      // print data
       if (!first) {
-        Serial.print(F(","));
+        Serial.print(F(", "));
       }
 
       first = false;
 
-      printAddress(rom);
-      Serial.print(F(":"));
-      Serial.print(((float)raw) / 16, 2);
+      print(rom, ((float)raw) / 16);
     }
 
     oneWire.reset_search();