diff --git a/documentation/SPI-Proto b/documentation/SPI-Proto
index 5f36039..56c3441 100644
--- a/documentation/SPI-Proto
+++ b/documentation/SPI-Proto
@@ -8,9 +8,6 @@ Where following values are Valid:
 |--------------------------------------------------------------------------------------------------------------------------|
 | Decimal		Hex	Name		Address		ValueL		ValueH		Reply		Description|
 |--------------------------------------------------------------------------------------------------------------------------|
-| 0000001		0x01	Read-Temp	Number of	zeroes/Rand	zeroes/Rand	A 16Bit Value	Reads the  |
-|						Thermometer					Representing 	Temperature|
-|						Starting with 0					the Temperature		   |
 |--------------------------------------------------------------------------------------------------------------------------|
 | 0000002		0x02	Read-Var8	Number of the	zeroes/Rand	zeroes/Rand	A 8Bit Value	Reads 8Bit |
 |  						var-DEFINE					read from VAR	Variable   |
@@ -21,10 +18,15 @@ Where following values are Valid:
 | 0000004		0x04	Write-Var8	Number of the	Value of Var	zeroes/Rand	zeroes/Rand	Writes 8Bit|
 |  						var-DEFINE	to write					Variable   |
 |--------------------------------------------------------------------------------------------------------------------------|
-| 0000005		0x05	Write-Var16	Number of the	Value of Var	Value of Var	zeroes/Rand	Writes 16  |
+| 0000005		0x05	Write-Var16						Number of the	Value of Var	Value of Var	zeroes/Rand	Writes 16  |
 |  						var-DEFINE	to write (HIGH)	to write (LOW)			Bit Var    |
 |--------------------------------------------------------------------------------------------------------------------------|
-| 0000006		0x06	Call-Func	Number of the	zeroes/Rand	zeroes/Rand	zeroes/Rand	Calls a    |
-|  						func-DEFINE					       		remote 	   |
-														function   |
+| 0000006		0x06	Call-Func								Number of the	zeroes/Rand	zeroes/Rand	zeroes/Rand	Calls a|
+|  						func-DEFINE																				remote 	   |
+|																												function   |
+|--------------------------------------------------------------------------------------------------------------------------|
+
+| 0000001		0x01	Read-Temp	Number of	zeroes/Rand	zeroes/Rand	A 16Bit Value	Reads the  |
+|						Thermometer					Representing 	Temperature|
+|						Starting with 0					the Temperature		   |
 |--------------------------------------------------------------------------------------------------------------------------|
diff --git a/firmware/shared/spi_proto.c b/firmware/shared/spi_proto.c
index 857f9e2..b78d16b 100644
--- a/firmware/shared/spi_proto.c
+++ b/firmware/shared/spi_proto.c
@@ -1,5 +1,6 @@
 #include "spi_proto.h"
 #include "spi.h"
+#include "main.h"
 
 /***** MASTER *****/
 
@@ -90,8 +91,9 @@ uint16_t spi_proto_slaveaction(uint8_t opcode, uint8_t addr, uint16_t data) {
 			//TODO: prevent a function from being run several times because the message gets repeated.
 			break;
 		case 7:
-			//TODO
-			retval = 0;
+			if(addr < 4) {
+				retval = temperatures[addr];
+			} else return 0;
 			break;
 		default:
 			break;
diff --git a/firmware/slavechip/main.c b/firmware/slavechip/main.c
index ae317b3..6f636f0 100644
--- a/firmware/slavechip/main.c
+++ b/firmware/slavechip/main.c
@@ -6,18 +6,11 @@
 
 #include "debug.h"
 
-uint8_t foo;
-uint16_t bar;
 uint16_t timertmp;
 uint16_t temperatures[4];
-
-int32_t temp_avg_cumul;
-int16_t temp_avg_count;
-
-
-void baz() {
-  foo++;
-}
+uint8_t sensor_active[4];
+int32_t temp_avg_cumul[4];
+int16_t temp_avg_count[4];
 
 /* pinout
  * - i2c:
@@ -36,9 +29,8 @@ void baz() {
 #define MUXER_CHANNEL_2 1
 #define MUXER_CHANNEL_3 3
 
+/* initializes the hardware */
 void hardinit() {
-  /* initializes the hardware */
-
   // enable softtimer isr
   TCCR1A = _BV(WGM10);
   TCCR1B = _BV(WGM12) | _BV(CS11); // clk/8 prescaler, 4kHz PWM-freq.
@@ -47,53 +39,45 @@ void hardinit() {
   spi_init();
 
   muxer_init();
-  
   i2c_init();
 
   sei();
 }
 
 void softinit() {
-	
-	//test values
-	foo = 0x87;
-	bar= 0xfafa;
-
 	mcpadc_init(ADC_GAIN_2|ADC_CONV_CONT|ADC_BITS_16);
-
 }
 
 
 int __attribute__((noreturn)) main(void) {
-  temperatures[2]=1;
   hardinit();
-  temperatures[2]=10;
   softinit();
 
   muxer_set(MUXER_CHANNEL_0);
-  temperatures[2]=0;
-  dbgLog("Hallo, Welt!\n");
 
   for(;;){
     
     SOFTTIMER(1,10) {
-		if(mcpadc_has_new_data()) {
-			temperatures[0] = mcpadc_get_data();
-			temperatures[2]++;
-			int16_t temp = temperatures[0];
-			temp_avg_cumul += temp;
-			temp_avg_count += 1;
-		}
-		temperatures[1] = 22;
+		for(int i=0; i<4; i++) {
+			if(sensor_active[i] && mcpadc_has_new_data(i)) {
+				temperatures[i] = mcpadc_get_data(i);
+				temp_avg_cumul[i] += temperatures[i];
+				temp_avg_count[i] += 1;
+			}
+		}		
     }
-	SOFTTIMER(2,500){
-		int32_t temp = temp_avg_cumul;
-		temp /= temp_avg_count;
-		temp_avg_count = 0; temp_avg_cumul = 0;
-		int32_t nV = (temp * 625);
-		int32_t mK = nV/39;
 
-		dbgLog("temp: %6li (%li µV, %li mK)\n",temp,nV/1000, mK);
+	SOFTTIMER(2,500){
+		for(int i=0; i<4; i++) {
+			if(sensor_active[i]) {
+				int32_t temp = temp_avg_cumul[i];
+				temp /= temp_avg_count[i];
+				temp_avg_count[i] = 0; temp_avg_cumul[i] = 0;
+				int32_t nV = (temp * 625);
+				int32_t mK = nV/39;
+				dbgLog("temp-%i: %6li (%li µV, %li mK)\n",i,temp,nV/1000, mK);
+			}
+		}
 	}
 
   }
diff --git a/firmware/slavechip/main.h b/firmware/slavechip/main.h
index 4544e03..3344c5c 100644
--- a/firmware/slavechip/main.h
+++ b/firmware/slavechip/main.h
@@ -14,11 +14,7 @@
 #include "softtimer.h"
 #include "debug.h"
 
-extern uint8_t foo;
-extern uint16_t bar;
 extern uint16_t timertmp;
 extern uint16_t temperatures[];
 
-void baz();
-
 #endif //__MAIN_H
diff --git a/firmware/slavechip/mcp_adc.c b/firmware/slavechip/mcp_adc.c
index ed40489..1c6856a 100644
--- a/firmware/slavechip/mcp_adc.c
+++ b/firmware/slavechip/mcp_adc.c
@@ -42,8 +42,10 @@ void mcpadc_init(uint8_t mode)
 	curmode = mode;
 }
 
-uint8_t mcpadc_has_new_data(void)
+uint8_t mcpadc_has_new_data(uint8_t channel)
 {
+	// TODO: implement channel
+
 	/* this assumes that the first RDY bit read after the sample data indicates the old/new state of the sample we just read */
 	if(unread_data_available){
 		// we already have new data, don't overwrite that by reading more
@@ -69,8 +71,9 @@ uint8_t mcpadc_has_new_data(void)
 }
 
 #if ADC_ENABLE_18_BIT_MODE
-int32_t mcpadc_get_data(void)
+int32_t mcpadc_get_data(uint8_t channel)
 {
+	// TODO: implement channel
 	if(!unread_data_available){
 		return 0;
 	}
@@ -86,7 +89,7 @@ int32_t mcpadc_get_data(void)
 	return value;
 }
 #else
-int16_t mcpadc_get_data(void)
+int16_t mcpadc_get_data(uint8_t channel)
 {
 	if(!unread_data_available){
 		return 0;
diff --git a/firmware/slavechip/mcp_adc.h b/firmware/slavechip/mcp_adc.h
index db90bcc..33cf987 100644
--- a/firmware/slavechip/mcp_adc.h
+++ b/firmware/slavechip/mcp_adc.h
@@ -26,15 +26,15 @@ void mcpadc_init(uint8_t mode);
 /* tests if the adc has a new sample
  * returns nonzero if new data is aviable, 0 otherwise
  */
-uint8_t mcpadc_has_new_data(void);
+uint8_t mcpadc_has_new_data(uint8_t channel);
 
 /* returns the most recent sample result of the adc
  * !! return type depends on defines
  */
 #if ADC_ENABLE_18_BIT_MODE
-int32_t mcpadc_get_data(void);
+int32_t mcpadc_get_data(uint8_t channel);
 #else
-int16_t mcpadc_get_data(void);
+int16_t mcpadc_get_data(uint8_t channel);
 #endif
 
 /* instructs the adc to take a new sample now
diff --git a/firmware/slavechip/spi_pointers.c b/firmware/slavechip/spi_pointers.c
index cb09299..3bf5ae0 100644
--- a/firmware/slavechip/spi_pointers.c
+++ b/firmware/slavechip/spi_pointers.c
@@ -7,18 +7,9 @@ uint8_t *spi_proto_globals8[] = {
 };
 
 uint16_t *spi_proto_globals16[] = {
-	&timertmp,
-	&temperatures[0],
-	&temperatures[1],
-	&temperatures[2],
-	&temperatures[3],
 };
 
 funptr_t spi_proto_funcs[] = {
 	&dbgHasNew,
 	&dbgAdvanceChar
 };
-
-
-
-