diff --git a/src/main.rs b/src/main.rs
index b6d3631..f976fca 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,8 @@
-//! # PWM Blink Example
+//! # Firmware for the handcrank project.
 //!
-//! If you have an LED connected to pin 25, it will fade the LED using the PWM
-//! peripheral.
-//!
-//! It may need to be adapted to your particular board layout and/or pin assignment.
-//!
-//! See the `Cargo.toml` file for Copyright and license details.
+//! Implements a voltage boost regulator. Measures the input and output voltages and output current
+//! using an external ADC connected via SPI to pins GP2 to GP5. The switching transistor is
+//! controlled directly via a PWM signal on pin GP10.
 
 #![no_std]
 #![no_main]
@@ -46,12 +43,6 @@ mod ext_adc;
 #[used]
 pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GENERIC_03H;
 
-/// The minimum PWM value (i.e. LED brightness) we want
-const LOW: u16 = 0;
-
-/// The maximum PWM value (i.e. LED brightness) we want
-const HIGH: u16 = 25000;
-
 /// External high-speed crystal on the Raspberry Pi Pico board is 12 MHz. Adjust
 /// if your board has a different frequency
 const XTAL_FREQ_HZ: u32 = 12_000_000u32;
@@ -109,7 +100,7 @@ fn main() -> ! {
 
     // The delay object lets us wait for specified amounts of time (in
     // milliseconds)
-    let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().to_Hz());
+    //let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().to_Hz());
 
     // UART
     let uart_pins = (
@@ -136,28 +127,19 @@ fn main() -> ! {
     pwm5.set_top(512);
     pwm5.enable();
 
-    let pwm6 = &mut pwm_slices.pwm6;
-    pwm6.set_ph_correct();
-    pwm6.enable();
-    let pwm7 = &mut pwm_slices.pwm7;
-    pwm7.set_ph_correct();
-    pwm7.enable();
+    // LED pins
+    let mut pin_led_r = pins.gpio13.into_push_pull_output();
+    let mut pin_led_y = pins.gpio14.into_push_pull_output();
+    let mut pin_led_g = pins.gpio15.into_push_pull_output();
 
-    // Output channel B on PWM4 to GPIO 25
-    let channel1 = &mut pwm6.channel_b;
-    channel1.output_to(pins.gpio13);
-    let channel2 = &mut pwm7.channel_a;
-    channel2.output_to(pins.gpio14);
-    let channel3 = &mut pwm7.channel_b;
-    channel3.output_to(pins.gpio15);
+    pin_led_r.set_high().unwrap();
+    pin_led_y.set_high().unwrap();
+    pin_led_g.set_high().unwrap();
 
+    // set up switch PWM
     let pwr_switch_ch = &mut pwm5.channel_a;
     pwr_switch_ch.output_to(pins.gpio10);
-    pwr_switch_ch.set_duty(450);
-
-    let mut ch_val: [u16; 3] = [LOW, LOW + (HIGH - LOW) / 3, LOW + 2 * (HIGH - LOW) / 3];
-
-    uart.write_full_blocking(b"Initialization complete!\r\n");
+    pwr_switch_ch.set_duty(400);
 
     // SPI CS pin is controlled by software
     let mut spi_cs = pins.gpio5.into_push_pull_output();
@@ -180,21 +162,10 @@ fn main() -> ! {
         spi_cs
         );
 
+    uart.write_full_blocking(b"Initialization complete!\r\n");
 
     // Infinite loop, fading LED up and down
     loop {
-        for i in 0..ch_val.len() {
-            ch_val[i] += 1;
-            if ch_val[i] > HIGH {
-                ch_val[i] -= HIGH - LOW;
-            }
-        }
-
-        channel1.set_duty(ch_val[0]);
-        channel2.set_duty(ch_val[1]);
-        channel3.set_duty(ch_val[2]);
-        delay.delay_us(50);
-
         let mut adc_value: [u16; 4] = [0; 4];
 
         (adc_ctrl, adc_value[0]) = adc_ctrl.sample_adc_channel(0);