diff --git a/Makefile b/Makefile
index 76f527c..9d4b473 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 DEFS		= -DSTM32L1
 
-FP_FLAGS	?= -msoft-float
+FP_FLAGS	?= -msoft-float -mfloat-abi=soft
 ARCH_FLAGS	= -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
 
 LDSCRIPT    = stm32l100rc.ld
@@ -21,8 +21,10 @@ OBJS += utils/usart.o
 OBJS += utils/timebase.o
 OBJS += utils/debounce.o
 OBJS += utils/nvic.o
+OBJS += utils/str_utils.o
 OBJS += init.o
 OBJS += blink.o
+OBJS += capture.o
 OBJS += lib/common.o
 
 ################################################################
diff --git a/capture.c b/capture.c
new file mode 100644
index 0000000..aeff424
--- /dev/null
+++ b/capture.c
@@ -0,0 +1,56 @@
+#include "capture.h"
+#include "utils/timebase.h"
+
+uint16_t adc_measure(uint8_t channel)
+{
+	ADC1_SQR5 = channel; // select n-th channel
+	ADC1_SQR1 = 0; // sets length to 1 (0000)
+
+	ADC1_CR2 |= ADC_CR2_SWSTART; // start conversion
+
+	// wait for end of conversion
+	while (!(ADC1_SR & ADC_SR_EOC));
+	return ADC1_DR;
+}
+
+
+float measure_angle(void)
+{
+	uint16_t d = adc_measure(18);
+	return -135 + 270 * (d / 4095.0f);
+}
+
+
+float measure_exposure(void)
+{
+	uint16_t d = adc_measure(8);
+	float alpha = d / 4095.0f;
+	return alpha * 100; // %
+}
+
+
+float measure_resistance(void)
+{
+	uint16_t d = adc_measure(9);
+
+	float alpha = d / 4095.0f;
+	float ref_r = 330;
+
+	return (ref_r * alpha) / (1 - alpha);
+}
+
+
+float measure_temp(void)
+{
+	uint16_t ts_data = adc_measure(ADC_CH_TEMP);
+
+	// temperature calibration constants for L100 are undocumented,
+	// probably because the sensor is broken.
+
+	// Temperature sensor is unstable and unreliable.
+
+	uint16_t ts_cal1 = MMIO16(0x1FF800FA);
+	uint16_t ts_cal2 = MMIO16(0x1FF800FE);
+
+	return ((80.0f / (ts_cal2 - ts_cal1)) * (ts_data - ts_cal1) + 30.0f);
+}
diff --git a/capture.h b/capture.h
new file mode 100644
index 0000000..9549e1e
--- /dev/null
+++ b/capture.h
@@ -0,0 +1,8 @@
+#pragma once
+#include <common.h>
+
+uint16_t adc_measure(uint8_t channel);
+float measure_temp(void);
+float measure_angle(void);
+float measure_resistance(void);
+float measure_exposure(void);
diff --git a/doc/controls.txt b/doc/controls.txt
new file mode 100644
index 0000000..fc41a49
--- /dev/null
+++ b/doc/controls.txt
@@ -0,0 +1,3 @@
+b,d - změna střídy PWM, krok 50 (rozsah 0-1000)
+m,n - změna hodnoty DAC, krok 117 (rozsah 0-4095)
+g - nulovat počítadlo závory
diff --git a/doc/output.txt b/doc/output.txt
new file mode 100644
index 0000000..a596df0
--- /dev/null
+++ b/doc/output.txt
@@ -0,0 +1 @@
+T -179.6°C | An -6.6° | R 589.2 | L 1.8% | G 0, #0 | DA 4095 | PWM 1000
diff --git a/init.c b/init.c
index c4745a2..52c35ac 100644
--- a/init.c
+++ b/init.c
@@ -13,6 +13,8 @@ void init_gpios(void)
 
 	// LEDs
 	gpio_set_mode(GPIOC, BIT8 | BIT9, MODER_OUTPUT);
+
+	gpio_set_mode(GPIOC, BIT11, MODER_INPUT);
 }
 
 
@@ -67,24 +69,71 @@ void init_systick(void)
 
 void init_adc(void)
 {
-	gpio_set_mode(GPIOB, BIT12, MODER_ANALOG);
+	// B1 ... AN9   Vcc o--[330R]--(B1)--[?R]--| GND
+	// B0 ... AN8   fototransistor
+	// B12 .. AN18  "angle" potentiometer
+	// C5 ... AN15
+
+	gpio_set_mode(GPIOB, BIT1 | BIT0 | BIT12, MODER_ANALOG);
+	//gpio_set_mode(GPIOC, BIT5, MODER_ANALOG);
+
+	// enable clock for ADC
+	RCC_APB2ENR |= RCC_APB2ENR_ADC1EN;
+
+	// 12-bit, right aligned
+	ADC1_CR1 = 0;
+	ADC1_CR2 = 0;
+
+	// enable internal temperature sensor (16) & voltage reference (17)
+	ADC_CCR |= ADC_CCR_TSVREFE;
 
-	// TODO
+	ADC1_SMPR3 = 0b100; // sample time
+
+	// turn ADC on
+	ADC1_CR2 |= ADC_CR2_ADON;
+	// Wait for ADONS
+	while (!(ADC1_SR & ADC_SR_ADONS));
 }
 
 
+void init_dac(void)
+{
+	RCC_APB1ENR |= RCC_APB1ENR_DACEN; // enable DAC
 
+	gpio_set_mode(GPIOA, BIT4, MODER_ANALOG); // PA4 - DAC CH1 out
 
+	DAC_CR |= DAC_CR_EN1; // enable first channel
+}
 
 
+void init_pwm1(void)
+{
+	// enable clock for the timer
+	RCC_APB1ENR |= RCC_APB1ENR_TIM3EN;
 
+	// using timer 3, channel 1
+	gpio_set_af(GPIOA, BIT6, AF2);
 
+	patch_register(&TIM3_CCMR1, TIM_CCMR1_OC1M, TIM_OCM_PWM1); // set PWM1 mode
 
+	TIM3_CCMR1 |= TIM_CCMR1_OC1PE; // preload enable
+	TIM3_CR1 |= TIM_CR1_ARPE; // auto reload is buffered
+	TIM3_CCER |= TIM_CCER_CC1E; // enable output compare (PWM output)
 
+	patch_register(&TIM3_CR1, TIM_CR1_CMS, TIM_CMS_EDGE); // centering mode
+	patch_register(&TIM3_CR1, TIM_CR1_DIR, 0); // count upwards only
 
+	// frequency set to 16 kHz
 
+	TIM3_PSC = 0; // prescaller
+	TIM3_ARR = 1000; // sets frequency
+	TIM3_CCR1 = 0; // duty cycle
 
+	// generate update event to latch the value registers
+	TIM3_EGR |= TIM_EGR_UG;
 
+	TIM3_CR1 |= TIM_CR1_CEN; // enable timer.
+}
 
 
 
diff --git a/init.h b/init.h
index 0ee49fd..a8d62f6 100644
--- a/init.h
+++ b/init.h
@@ -6,3 +6,5 @@ void init_gpios(void);
 void init_usart(void);
 void init_systick(void);
 void init_adc(void);
+void init_dac(void);
+void init_pwm1(void);
diff --git a/lib/common.c b/lib/common.c
index 729b031..0dd7ad0 100644
--- a/lib/common.c
+++ b/lib/common.c
@@ -9,3 +9,10 @@ inline uint32_t __RBIT(uint32_t value)
 	return (result);
 }
 
+
+__attribute__((always_inline))
+inline void patch_register(io32_t reg, uint32_t mask, uint32_t replacement)
+{
+	*reg &= ~mask;
+	*reg |= replacement << __CTZ(mask);
+}
diff --git a/lib/common.h b/lib/common.h
index 6d8cc63..d157e6a 100644
--- a/lib/common.h
+++ b/lib/common.h
@@ -30,6 +30,7 @@ typedef volatile uint64_t* io64_t;
 #define wait_for_interrupt() __asm__("WFI")
 
 #define __CLZ(div) __builtin_clz(div)
+#define __CTZ(div) __builtin_ctz(div)
 #define count_leading_zeros(div) __CLZ(div)
 
 #define __REV(x) __builtin_bswap32(x)
@@ -86,6 +87,9 @@ uint32_t __RBIT(uint32_t value); // defined in c file as inline asm
 #define BIT31 BIT(31)
 
 
+void patch_register(io32_t reg, uint32_t mask, uint32_t replacement);
+
+
 
 #include "defs_base.h"
 #include "defs_gpio.h"
diff --git a/lib/defs_adc.h b/lib/defs_adc.h
index bdde6a4..f217f72 100644
--- a/lib/defs_adc.h
+++ b/lib/defs_adc.h
@@ -20,6 +20,10 @@
 
 // ADC1
 
+// internal channels
+#define ADC_CH_TEMP	16
+#define ADC_CH_VREF	17
+
 #define ADC1_SR          MMIO32(ADC1_BASE + 0x00) // ADC status register,
 #define ADC1_CR1         MMIO32(ADC1_BASE + 0x04) // ADC control register 1,
 #define ADC1_CR2         MMIO32(ADC1_BASE + 0x08) // ADC control register 2,
@@ -46,7 +50,6 @@
 #define ADC1_SMPR0       MMIO32(ADC1_BASE + 0x5C) // ADC sample time register 0,
 
 
-
 //****************************************************************************
 //*
 //*                       BIT MASKS AND DEFINITIONS
diff --git a/lib/defs_base.h b/lib/defs_base.h
index fdc2b78..9626643 100644
--- a/lib/defs_base.h
+++ b/lib/defs_base.h
@@ -114,10 +114,12 @@
 #define DESIG_UNIQUE_ID2		MMIO32(DESIG_UNIQUE_ID_BASE + 0x14)
 
 /* ST provided factory calibration values @ 3.0V */
-#define ST_VREFINT_CAL			MMIO16(0x1FF80078)
-#define ST_TSENSE_CAL1_30C		MMIO16(0x1FF8007A)
-#define ST_TSENSE_CAL2_110C		MMIO16(0x1FF8007E)
-
+//#define ST_VREFINT_CAL			MMIO16(0x1FF80078)
+//#define ST_TSENSE_CAL1_30C		MMIO16(0x1FF8007A)
+//#define ST_TSENSE_CAL2_110C		MMIO16(0x1FF8007E)
+#define ST_VREFINT_CAL			MMIO16(0x1FF800F8)
+#define ST_TSENSE_CAL1_30C		MMIO16(0x1FF800FA)
+#define ST_TSENSE_CAL2_110C		MMIO16(0x1FF800FE)
 
 // ---- ARMv7M+ only ----
 
diff --git a/lib/defs_timers.h b/lib/defs_timers.h
index a296230..20979d4 100644
--- a/lib/defs_timers.h
+++ b/lib/defs_timers.h
@@ -253,6 +253,13 @@
 #define TIM_CR1_CMS_0                       0x0020            // Bit 0
 #define TIM_CR1_CMS_1                       0x0040            // Bit 1
 
+enum TIM_CenterAlignMode {
+	TIM_CMS_EDGE = 0,
+	TIM_CMS_CENTER_FLAGS_UP = 1,
+	TIM_CMS_CENTER_FLAGS_DOWN = 2,
+	TIM_CMS_CENTER_FLAGS_BOTH = 3,
+};
+
 #define TIM_CR1_ARPE                        0x0080            // Auto-reload preload enable
 
 #define TIM_CR1_CKD                         0x0300            // CKD[1:0] bits (clock division)
@@ -344,6 +351,17 @@
 #define TIM_CCMR1_OC1M_1                    0x0020            // Bit 1
 #define TIM_CCMR1_OC1M_2                    0x0040            // Bit 2
 
+enum TIM_OutputCompareMode {
+	TIM_OCM_FROZEN = 0,
+	TIM_OCM_HIGH_ON_MATCH = 1,
+	TIM_OCM_LOW_ON_MATCH = 2,
+	TIM_OCM_TOGGLE_ON_MATCH = 3,
+	TIM_OCM_FORCE_LOW = 4,
+	TIM_OCM_FORCE_HIGH = 5,
+	TIM_OCM_PWM1 = 6,
+	TIM_OCM_PWM2 = 7,
+};
+
 #define TIM_CCMR1_OC1CE                     0x0080            // Output Compare 1Clear Enable
 
 #define TIM_CCMR1_CC2S                      0x0300            // CC2S[1:0] bits (Capture/Compare 2 Selection)
diff --git a/main.c b/main.c
index b04e67a..c020ac6 100644
--- a/main.c
+++ b/main.c
@@ -1,16 +1,19 @@
 #include <common.h>
 
+#include <stdio.h>
+
 #include "utils/usart.h"
 #include "utils/timebase.h"
 #include "utils/debounce.h"
+#include "utils/str_utils.h"
 
 #include "init.h"
 #include "blink.h"
+#include "capture.h"
 
-void say_hello(void)
-{
-	usart_tx_string(USART3, "HELLO\r\n");
-}
+// Gate state
+static bool gate_closed = false;
+static uint32_t gate_cnt = 0;
 
 
 /** IRQ */
@@ -24,8 +27,34 @@ void USART2_IRQHandler(void)
 	if (USART2_SR & USART_SR_RXNE) {
 		blue_blink();
 
+		// handle incoming char.
 		char c = usart_rx_char(USART2);
-		usart_tx_char(USART2, c);
+
+		switch (c) {
+			case 'g': // nulovat pocitadlo preruseni
+				gate_cnt = 0;
+				break;
+
+			case 'm': // zvysit DAC hodnotu
+				if (DAC_DHR12R1 < 4095) DAC_DHR12R1 += 117;
+				break;
+
+			case 'n': // snizit DAC hodnotu
+				if (DAC_DHR12R1 > 0) DAC_DHR12R1 -= 117;
+				break;
+
+			case 'b': // zvysit PWM stridu
+				if (TIM3_CCR1 < 1000) TIM3_CCR1 += 50;
+				break;
+
+			case 'd': // snizit PWM stridu
+				if (TIM3_CCR1 > 0) TIM3_CCR1 -= 50;
+				break;
+
+			default:
+				break;
+		}
+
 
 		USART2_SR ^= USART_SR_RXNE;
 	}
@@ -33,7 +62,21 @@ void USART2_IRQHandler(void)
 
 
 
-/** Called by startup script, before main() */
+// Gate close handler
+void gate_close(void)
+{
+	gate_closed = 1;
+	gate_cnt++;
+}
+
+// Gate open handler
+void gate_open(void)
+{
+	gate_closed = 0;
+}
+
+
+/** Init peripherals; Called by startup script, before main() */
 void SystemInit(void)
 {
 	init_clock();
@@ -41,12 +84,62 @@ void SystemInit(void)
 	init_gpios();
 	init_usart();
 	init_adc();
+	init_dac();
+	init_pwm1();
+
+	register_periodic_task(green_toggle, 1000); // indicate running state
 
-	register_periodic_task(green_toggle, 1000);
+	register_debounced_pin(GPIOB, 11, gate_close, gate_open); // gate handler
 }
 
 
+
 int main(void)
 {
-	while (1);
+	char buf[200];
+
+	usart_tx_string(USART2, "DAQ system started.\n");
+
+	while (1) {
+		delay_ms(200);
+
+		float cels = measure_temp();
+		float angle = measure_angle();
+		float resis = measure_resistance();
+		float expos = measure_exposure();
+
+		buf_reset(buf);
+		buf_append_str(buf, "T ");
+		buf_append_flt(buf, cels, 1);
+		buf_append_str(buf, "°C | ");
+
+		buf_append_str(buf, "An ");
+		buf_append_flt(buf, angle, 1);
+		buf_append_str(buf, "° | ");
+
+		buf_append_str(buf, "R ");
+		buf_append_flt(buf, resis, 1);
+		buf_append_str(buf, " | ");
+
+		buf_append_str(buf, "L ");
+		buf_append_flt(buf, expos, 1);
+		buf_append_str(buf, "% | ");
+
+		buf_append_str(buf, "G ");
+		buf_append_str(buf, gate_closed ? "1" : "0");
+		buf_append_str(buf, ", #");
+		buf_append_int(buf, gate_cnt);
+		buf_append_str(buf, " | ");
+
+		buf_append_str(buf, "DA ");
+		buf_append_int(buf, DAC_DHR12R1);
+		buf_append_str(buf, " | ");
+
+		buf_append_str(buf, "PWM ");
+		buf_append_int(buf, TIM3_CCR1);
+
+		buf_append_str(buf, "\n");
+
+		usart_tx_string(USART2, buf);
+	}
 }
diff --git a/proj.pro b/proj.pro
index 682cbe0..dd82eab 100644
--- a/proj.pro
+++ b/proj.pro
@@ -31,7 +31,9 @@ SOURCES += \
     utils/debounce.c \
     blink.c \
     lib/common.c \
-    utils/nvic.c
+    utils/nvic.c \
+    capture.c \
+    utils/str_utils.c
 
 HEADERS += \
     lib/common.h \
@@ -58,5 +60,7 @@ HEADERS += \
     lib/defs_spi.h \
     lib/defs_timers.h \
     lib/defs_nvic.h \
-    utils/nvic.h
+    utils/nvic.h \
+    capture.h \
+    utils/str_utils.h
 
diff --git a/utils/str_utils.c b/utils/str_utils.c
new file mode 100644
index 0000000..1d5ef67
--- /dev/null
+++ b/utils/str_utils.c
@@ -0,0 +1,79 @@
+#include "str_utils.h"
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+
+
+void buf_reset(char *buf)
+{
+	buf[0] = 0;
+}
+
+
+void buf_append_int(char *buf, int d)
+{
+	buf += strlen(buf);
+	sprintf(buf, "%d", d);
+}
+
+
+void buf_append_flt(char *buf, float f, uint8_t places)
+{
+	buf += strlen(buf);
+
+	if (isnan(f)) {
+		sprintf(buf, "NAN");
+		return;
+	}
+
+	if (isinf(f)) {
+		sprintf(buf, "INF");
+		return;
+	}
+
+	if (isinf(f) && f < 0) {
+		sprintf(buf, "-INF");
+		return;
+	}
+
+	bool minus = 0;
+	if (f < 0) {
+		minus = 1;
+		f = -f;
+	}
+
+	int ones = 0, dec = 0;
+
+	ones = (int)f;
+	f -= ones;
+
+	if (minus) {
+		buf[0] = '-';
+		buf++;
+	}
+
+	switch (places) {
+		case 0:
+			sprintf(buf, "%d", ones);
+			return;
+		case 1:
+			dec = (f * 10);
+			sprintf(buf, "%d.%01d", ones, dec);
+			return;
+		case 2:
+			dec = (f * 100);
+			sprintf(buf, "%d.%02d", ones, dec);
+			return;
+		default:
+		case 3:
+			dec = (f * 1000);
+			sprintf(buf, "%d.%03d", ones, dec);
+			return;
+	}
+}
+
+
+void buf_append_str(char *buf, const char *app)
+{
+	sprintf(buf + strlen(buf), "%s", app);
+}
diff --git a/utils/str_utils.h b/utils/str_utils.h
new file mode 100644
index 0000000..ff35ec9
--- /dev/null
+++ b/utils/str_utils.h
@@ -0,0 +1,10 @@
+#pragma once
+#include <common.h>
+
+void buf_reset(char *buf);
+
+void buf_append_flt(char *buf, float f, uint8_t places);
+
+void buf_append_str(char *buf, const char *app);
+
+void buf_append_int(char *buf, int d);