Refactor everything + RGB

Cargo.toml

@@ -11,11 +11,21 @@ embedded-graphics = "0.7.1"
 linux-embedded-hal = "0.3.0"
 embedded-hal = "0.2.5"
 machine-ip = "0.2.1"
-ssd1306 = "0.6.0"
+#ssd1306 = "0.6.0"
 libc = "0.2.98"
 gpio-cdev = "0.4"
 dht-hal = "0.0.1"
 rusqlite = "0.25.3"
+time = { version = "0.3.9", features = ["parsing"] }
+time-tz = "1.0.1"
+image = "0.24.1"
+serde_json = "1.0.79"
+serde_derive = "1.0.136"
+serde = "1.0.136"
+rppal = { version = "0.13.1", features = ["hal"] }
+#ssd1351 = "0.4.0"
+ssd1351 = { path = "../ssd1351-rust" }
+display-interface-spi = "0.4.1"
 
 [profile.release]
 codegen-units = 1

src/bin/display_all.rs

@@ -0,0 +1,422 @@
+use std::fs;
+
+use display_interface_spi::SPIInterfaceNoCS;
+use embedded_graphics::{
+	draw_target::DrawTarget,
+	mono_font::{
+		ascii::{FONT_10X20, FONT_5X8, FONT_6X9, FONT_9X15},
+		MonoTextStyleBuilder,
+	},
+	pixelcolor::{BinaryColor, Rgb565},
+	prelude::{OriginDimensions, Point, Primitive, Size},
+	primitives::{PrimitiveStyleBuilder, Rectangle},
+	text::Text,
+	Drawable,
+};
+use image::{ImageBuffer, Rgb};
+use linux_embedded_hal::I2cdev;
+use rppal::{
+	gpio::Gpio,
+	hal::Delay,
+	spi::{Bus, Mode, SlaveSelect, Spi},
+};
+use rusqlite::Connection;
+use serde_derive::Deserialize;
+//use ssd1306::{I2CDisplayInterface, Ssd1306, size::DisplaySize128x64, rotation::DisplayRotation, mode::DisplayConfig};
+use time::{format_description, OffsetDateTime, PrimitiveDateTime};
+use time_tz::{timezones::db::europe::BERLIN, OffsetDateTimeExt, PrimitiveDateTimeExt};
+
+#[derive(Deserialize)]
+struct Events {
+	events: Vec<Event>,
+	weekly: Vec<Weekly>,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct Event {
+	name: String,
+	start_time: String,
+}
+
+#[derive(Deserialize)]
+struct Weekly {
+	name: String,
+	day: i32,
+	hour: i32,
+	minute: i32,
+	duration: i32,
+}
+
+fn main() {
+	let args = std::env::args().collect::<Vec<_>>();
+	if args.len() < 4 {
+		panic!("missing argument: database path, event JSON data file, events / temps");
+	}
+	let database = Connection::open(&args[1]).expect("failed to open database");
+	let events = fs::read_to_string(&args[2]).expect("failed to read events.json");
+	let events: Events = serde_json::from_str(&events).unwrap();
+
+	let (rh, temp): (i64, i64) = database
+		.query_row(
+			"SELECT humidity, celsius FROM sensor_readings ORDER BY sensor_readings.time DESC LIMIT 1",
+			[],
+			|row| Ok((row.get(0).unwrap(), row.get(1).unwrap())),
+		)
+		.unwrap();
+
+	let time = OffsetDateTime::now_utc().to_timezone(BERLIN);
+
+	let mut query = database
+		.prepare("SELECT celsius FROM sensor_readings ORDER BY sensor_readings.time DESC LIMIT 288")
+		.unwrap();
+	let mut temps: Vec<i32> = query
+		.query_map([], |r| Ok(r.get(0)))
+		.unwrap()
+		.map(Result::unwrap)
+		.map(Result::unwrap)
+		.collect();
+	let mut global_min = 1000;
+	let mut global_max = 0;
+	let mut vals: Vec<(i32, i32)> = vec![];
+	for hour in temps.chunks_mut(6) {
+		hour.sort();
+		let mut min = hour[1];
+		let mut max = hour[hour.len() - 2];
+		println!("min {} max {}", min, max);
+		// sanity check value
+		if max > 300 {
+			if vals.is_empty() {
+				max = min;
+			} else {
+				max = vals.last().unwrap().1;
+			}
+			min = min.min(max);
+		}
+
+		global_min = min.min(global_min);
+		global_max = max.max(global_max);
+		vals.push((min, max));
+	}
+	println!("global {} | {}", global_min, global_max);
+
+	let hour = time.hour();
+	let minute = time.minute();
+	//let i2c = I2cdev::new("/dev/i2c-1").unwrap();
+	//let interface = I2CDisplayInterface::new(i2c);
+	//let mut disp = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0).into_buffered_graphics_mode();
+	//disp.init().unwrap();
+	//let mut disp = FrameOutput { buffer: ImageBuffer::new(128, 64) };
+	let spi = Spi::new(Bus::Spi0, SlaveSelect::Ss0, 19660800, Mode::Mode0).unwrap();
+	let gpio = Gpio::new().unwrap();
+	let dc = gpio.get(25).unwrap().into_output();
+	let mut rst = gpio.get(27).unwrap().into_output();
+
+	// Init SPI
+	let spii = SPIInterfaceNoCS::new(spi, dc);
+	let mut disp = ssd1351::display::display::Ssd1351::new(spii);
+
+	// Reset & init
+	//disp.reset(&mut rst, &mut Delay).unwrap();
+	//disp.turn_on().unwrap();
+
+	let text_style_clock = MonoTextStyleBuilder::new()
+		.font(&FONT_10X20)
+		.text_color(Rgb565::new(0xff, 0xff, 0xff))
+		.build();
+	let text_style2 = MonoTextStyleBuilder::new()
+		.font(&FONT_9X15)
+		.text_color(Rgb565::new(0xff, 0xff, 0xff))
+		.build();
+	let text_style3 = MonoTextStyleBuilder::new()
+		.font(&FONT_6X9)
+		.text_color(Rgb565::new(0xff, 0xff, 0xff))
+		.build();
+	let text_style4 = MonoTextStyleBuilder::new()
+		.font(&FONT_5X8)
+		.text_color(Rgb565::new(0xff, 0xff, 0xff))
+		.build();
+	let rect_style = PrimitiveStyleBuilder::new()
+		.fill_color(Rgb565::new(0xff, 0xff, 0xff))
+		.build();
+
+	//let text = format!("{}.{}% {}.{}°C", rh / 10, rh % 10, temp / 10, temp % 10);
+	//Text::new(&text, Point::new(0, 10), text_style).draw(&mut disp).unwrap();
+	let hour = format!("{:02}", hour);
+	Text::new(&hour, Point::new(64 + 10, 6 + 20), text_style_clock)
+		.draw(&mut disp)
+		.unwrap();
+	let minute = format!("{:02}", minute);
+	Text::new(&minute, Point::new(64 + 10 + 20 + 4, 6 + 20), text_style_clock)
+		.draw(&mut disp)
+		.unwrap();
+	Rectangle::new((95, 17).into(), (2, 2).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+	Rectangle::new((95, 22).into(), (2, 2).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+
+	let rh = format!("{:02}", rh / 10);
+	Text::new(&rh, Point::new(64 + 3, 64 - 4), text_style2)
+		.draw(&mut disp)
+		.unwrap();
+	Text::new("%", Point::new(64 + 3 + 18, 64 - 4), text_style3)
+		.draw(&mut disp)
+		.unwrap();
+	let temp_int = format!("{:02}", temp / 10);
+	Text::new(&temp_int, Point::new(64 + 32 + 3, 64 - 4), text_style2)
+		.draw(&mut disp)
+		.unwrap();
+	Rectangle::new((64 + 32 + 3 + 18, 64 - 4).into(), (1, 1).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+	let temp_fract = format!("{}", temp % 10);
+	Text::new(&temp_fract, Point::new(64 + 32 + 3 + 18 + 2, 64 - 4), text_style3)
+		.draw(&mut disp)
+		.unwrap();
+
+	for (x, y) in [
+		(118, 49),
+		(119, 49),
+		(117, 50),
+		(117, 51),
+		(120, 50),
+		(120, 51),
+		(118, 52),
+		(119, 52),
+		(122, 50),
+		(122, 51),
+		(122, 52),
+		(123, 49),
+		(124, 49),
+		(123, 53),
+		(124, 53),
+	] {
+		Rectangle::new((x, y).into(), (1, 1).into())
+			.into_styled(rect_style)
+			.draw(&mut disp)
+			.unwrap();
+	}
+
+	let x = 0;
+	let y = 0;
+	Rectangle::new((x + 2, y + 8).into(), (1, 24).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+	Rectangle::new((x + 1, y + 16).into(), (1, 1).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+	Rectangle::new((x + 1, y + 28).into(), (1, 1).into())
+		.into_styled(rect_style)
+		.draw(&mut disp)
+		.unwrap();
+	let mut day = time.weekday().number_days_from_monday() as usize;
+	let days = [
+		("M", "o"),
+		("D", "i"),
+		("M", "i"),
+		("D", "o"),
+		("F", "r"),
+		("S", "a"),
+		("S", "o"),
+	];
+	for i in 0..5 {
+		Text::new(days[day].0, (x + 12 * i + 4, y + 6).into(), text_style3)
+			.draw(&mut disp)
+			.unwrap();
+		Text::new(days[day].1, (x + 12 * i + 10, y + 6).into(), text_style4)
+			.draw(&mut disp)
+			.unwrap();
+		day += 1;
+		day %= days.len();
+	}
+	let mut bits = vec![];
+	// events
+	let mut all_events = vec![];
+	for event in events.weekly {
+		all_events.push((event.day, event.hour, event.minute, event.duration, event.name));
+	}
+	let today = time.date().to_julian_day();
+	let format = format_description::parse("[year]-[month]-[day]T[hour]:[minute]:[second]").unwrap();
+	for event in events.events {
+		let dt = PrimitiveDateTime::parse(&event.start_time, &format)
+			.unwrap()
+			.assume_timezone(BERLIN)
+			.unwrap();
+		let julian_day = dt.to_julian_day();
+		if dt < time || julian_day - today > 4 {
+			continue;
+		}
+		all_events.push((
+			dt.weekday().number_days_from_monday() as _,
+			dt.hour() as _,
+			dt.minute() as _,
+			30,
+			event.name,
+		)); // TODO length
+	}
+	let weekday = time.weekday().number_days_from_monday() as i32;
+	all_events.sort_by_key(|x| (((x.0 + 7) - weekday) % 7, x.1, x.2));
+	println!("{:?}", all_events);
+	let mut time_until_first = None;
+	for i in 0..5 {
+		let day = (weekday + i) % 7;
+		for hour in 0..24 {
+			for minute in 0..60 {
+				if minute % 6 != 0 {
+					continue;
+				}
+
+				if i == 0 && hour == time.hour() as i32 && minute == (time.minute() as i32 / 6) * 6 {
+					bits.push((i, hour, minute / 6, Rgb565::new(0xff, 0x00, 0xff)));
+				}
+
+				for event in &all_events {
+					if event.0 != day {
+						continue;
+					}
+					let event_start = event.1 * 60 + event.2;
+					let event_end = event_start + event.3;
+					let now = hour * 60 + minute;
+					let now2 = hour * 60 + minute + 6;
+					if now2 > event_start && now < event_end {
+						bits.push((i, hour, minute / 6, Rgb565::new(0xff, 0xff, 0x10)));
+					}
+					if time_until_first.is_none() {
+						time_until_first = Some(
+							((i * 24 + event.1) * 60 + event.2) * 60
+								- (time.hour() as i32 * 60 + time.minute() as i32) * 60,
+						);
+					}
+				}
+			}
+		}
+	}
+	for (d, h, m, color) in bits {
+		// calculate position
+		let x = x + 4 + d * 12 + m;
+		let y = y + 8 + h;
+		disp.fill_solid(&Rectangle::new((x, y).into(), (1, 1).into()), color)
+			.unwrap();
+		//Rectangle::new((x, y).into(), (1, 1).into()).into_styled(rect_style).draw(&mut disp).unwrap();
+	}
+	if args[3] == "events" {
+		for (i, event) in all_events.iter().take(7).enumerate() {
+			let text = if event.4.len() > 10 { &event.4[0..10] } else { &event.4 };
+			Text::new(text, (x + 2, y + 64 + 9 * i as i32 + 5).into(), text_style3)
+				.draw(&mut disp)
+				.unwrap();
+		}
+	} else {
+		let diff = global_max - global_min;
+		let x = 0;
+		let y = 64;
+		let scaley = 63;
+		let scalex = 2;
+		vals.reverse();
+		for (i, (a, b)) in vals.into_iter().enumerate() {
+			let x = x + i as i32 * scalex;
+			let y1 = y + (global_max - b) * scaley / diff;
+			let y2 = y + (global_max - a) * scaley / diff;
+			let height = y2 - y1 + 1;
+			let rect = Rectangle::new((x, y1).into(), (scalex as u32, height as u32).into());
+			disp.fill_solid(&rect, Rgb565::new(0xff, 0xff, 0xff)).unwrap();
+		}
+		Text::new(
+			&format!("{}", global_max as f32 / 10.0),
+			(100, 64 + 10).into(),
+			text_style3,
+		)
+		.draw(&mut disp)
+		.unwrap();
+		Text::new(
+			&format!("{}", global_min as f32 / 10.0),
+			(100, 64 + 50).into(),
+			text_style3,
+		)
+		.draw(&mut disp)
+		.unwrap();
+	}
+	if let Some(secs) = time_until_first {
+		let days = secs / (24 * 60 * 60);
+		let hours = secs / (60 * 60) % 24;
+		let minutes = secs / 60 % 60;
+		let text = if days > 0 {
+			String::new()
+		} else if hours > 0 {
+			format!("{}h{}m", hours, minutes)
+		} else if minutes > 0 {
+			format!("{}m", minutes)
+		} else {
+			"?".into()
+		};
+		Text::new(&text, (x + 2, y + 60).into(), text_style2)
+			.draw(&mut disp)
+			.unwrap();
+	}
+	/*
+	sleep(Duration::from_secs(2));
+	disp.clear();
+
+	let base_y = 0.0;
+	let max_dy = 32.0;
+	let mut tick = 0;
+	loop {
+		let y = if tick % 32 < 16 {
+			base_y + (tick % 16) as f32 / 16.0 * max_dy
+		} else {
+			base_y + max_dy - (tick % 16) as f32 / 16.0 * max_dy
+		} as i32;
+		tick += 1;
+		Line::new(Point::new(8, y + 16), Point::new(8 + 16, y + 16))
+			.into_styled(PrimitiveStyle::with_stroke(BinaryColor::On, 1))
+			.draw(&mut disp).unwrap();
+		Line::new(Point::new(8, y + 16), Point::new(8 + 8, y))
+			.into_styled(PrimitiveStyle::with_stroke(BinaryColor::On, 1))
+			.draw(&mut disp).unwrap();
+
+		Line::new(Point::new(8 + 16, y + 16), Point::new(8 + 8, y))
+			.into_styled(PrimitiveStyle::with_stroke(BinaryColor::On, 1))
+			.draw(&mut disp).unwrap();
+
+		Rectangle::new(Point::new(48, y), Size::new(16, 16))
+			.into_styled(PrimitiveStyle::with_stroke(BinaryColor::On, 1))
+			.draw(&mut disp).unwrap();
+
+
+		Circle::new(Point::new(88, y), 16)
+			.into_styled(PrimitiveStyle::with_stroke(BinaryColor::On, 1))
+			.draw(&mut disp).unwrap();
+
+		/*
+		Text::new(&format!("Hello from frame {}", tick), Point::new(0, 56), text_style)
+			.draw(&mut disp)
+			.unwrap();
+		*/
+		disp.flush().unwrap();
+
+		sleep(Duration::from_millis(10));
+
+		disp.clear();
+
+		/*
+		let im: ImageRaw<BinaryColor> = ImageRaw::new(IMG_DATA, 64);
+		let img = Image::new(&im, Point::new(32, 0));
+		img.draw(&mut disp).unwrap();
+		disp.flush().unwrap();
+
+		sleep(Duration::from_secs(2));
+		disp.clear();
+		*/
+	}
+	*/
+
+	let _ = disp.flush();
+	//disp.buffer.save("/tmp/frame.png").unwrap();
+}

src/bin/display_off.rs

@@ -0,0 +1,33 @@
+use display_interface_spi::SPIInterfaceNoCS;
+use rppal::{
+	gpio::Gpio,
+	hal::Delay,
+	spi::{Bus, Mode, SlaveSelect, Spi},
+};
+
+fn main() {
+	let args = std::env::args().collect::<Vec<_>>();
+	if args.len() < 2 {
+		panic!("missing argument: on/off");
+	}
+	display_on_ssd1306(args[1] == "on");
+}
+
+fn display_on_ssd1306(on: bool) {
+	let spi = Spi::new(Bus::Spi0, SlaveSelect::Ss0, 19660800, Mode::Mode0).unwrap();
+	let gpio = Gpio::new().unwrap();
+	let dc = gpio.get(25).unwrap().into_output();
+	let mut rst = gpio.get(27).unwrap().into_output();
+
+	// Init SPI
+	let spii = SPIInterfaceNoCS::new(spi, dc);
+	let mut disp = ssd1351::display::display::Ssd1351::new(spii);
+
+	// Reset & init
+	disp.reset(&mut rst, &mut Delay).unwrap();
+	if on {
+		disp.turn_on().unwrap();
+	} else {
+		disp.turn_off().unwrap();
+	}
+}

src/bin/rgb_test.rs

@@ -0,0 +1,102 @@
+use std::{
+	fs, thread,
+	time::{Duration, Instant},
+};
+
+use display_interface_spi::SPIInterfaceNoCS;
+use embedded_graphics::{
+	draw_target::DrawTarget,
+	mono_font::{
+		ascii::{FONT_10X20, FONT_5X8, FONT_6X9, FONT_9X15},
+		MonoTextStyleBuilder,
+	},
+	pixelcolor::{BinaryColor, Rgb565},
+	prelude::{OriginDimensions, Point, Primitive, Size},
+	primitives::{PrimitiveStyleBuilder, Rectangle},
+	text::Text,
+	Drawable,
+};
+use embedded_hal::digital::v2::OutputPin;
+use gpio_cdev::{Chip, LineHandle, LineRequestFlags};
+use image::{ImageBuffer, Rgb};
+use linux_embedded_hal::I2cdev;
+use rppal::{
+	gpio::Gpio,
+	hal::Delay,
+	spi::{Bus, Mode, SlaveSelect, Spi},
+};
+//use ssd1351::{properties::DisplaySize, mode::{GraphicsMode, displaymode::DisplayModeTrait}};
+use time::{format_description, OffsetDateTime, PrimitiveDateTime};
+//use time_tz::{timezones::db::europe::BERLIN, OffsetDateTimeExt, PrimitiveDateTimeExt};
+
+fn main() {
+	//let i2c = I2cdev::new("/dev/i2c-1").unwrap();
+	//let interface = I2CDisplayInterface::new(i2c);
+	//let mut disp = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0).into_buffered_graphics_mode();
+	//disp.init().unwrap();
+	// Configure gpio
+	let spi = Spi::new(Bus::Spi0, SlaveSelect::Ss0, 19660800, Mode::Mode0).unwrap();
+	let gpio = Gpio::new().unwrap();
+	let dc = gpio.get(25).unwrap().into_output();
+	let mut rst = gpio.get(27).unwrap().into_output();
+
+	// Init SPI
+	let spii = SPIInterfaceNoCS::new(spi, dc);
+	let mut disp = ssd1351::display::display::Ssd1351::new(spii);
+
+	// Reset & init
+	disp.reset(&mut rst, &mut Delay).unwrap();
+	disp.turn_on().unwrap();
+
+	/*
+	thread::sleep(Duration::from_secs(5));
+	disp.reset(&mut rst, &mut Delay).unwrap();
+	disp.turn_off().unwrap();
+	panic!("done!");
+	*/
+
+	// Clear the display
+	disp.clear(Rgb565::new(0x00, 0x00, 0x00)).unwrap();
+
+	//disp.flush().unwrap();
+	//disp.flush().unwrap();
+
+	let text_style_clock = MonoTextStyleBuilder::new()
+		.font(&FONT_10X20)
+		.text_color(Rgb565::new(0xff, 0x00, 0x00))
+		.build();
+
+	//let text = format!("{}.{}% {}.{}°C", rh / 10, rh % 10, temp / 10, temp % 10);
+	//Text::new(&text, Point::new(0, 10), text_style).draw(&mut disp).unwrap();
+	Text::new("Abc", (0, 30).into(), text_style_clock)
+		.draw(&mut disp)
+		.unwrap();
+
+	let _ = disp.flush();
+
+	thread::sleep(Duration::from_secs(15));
+	Text::new("5 seconds to off!", (0, 60).into(), text_style_clock)
+		.draw(&mut disp)
+		.unwrap();
+	let start = Instant::now();
+	let _ = disp.flush();
+	println!("{:?} ms", start.elapsed().as_millis());
+	thread::sleep(Duration::from_secs(5));
+
+	disp.reset(&mut rst, &mut Delay).unwrap();
+	disp.turn_off().unwrap();
+}
+
+struct LineHandleWrapper(LineHandle);
+
+impl OutputPin for LineHandleWrapper {
+	type Error = gpio_cdev::Error;
+
+	fn set_low(&mut self) -> Result<(), Self::Error> {
+		self.0.set_value(0)
+	}
+
+	fn set_high(&mut self) -> Result<(), Self::Error> {
+		self.0.set_value(1)
+	}
+}

src/bin/take_measurement.rs

@@ -0,0 +1,53 @@
+use std::time::{Duration, SystemTime};
+
+use gpio_cdev::Chip;
+use rusqlite::{params, Connection};
+
+fn main() {
+	let args = std::env::args().collect::<Vec<_>>();
+	if args.len() < 2 {
+		panic!("missing argument: database path");
+	}
+	let database = Connection::open(&args[1]).expect("failed to open database");
+	database
+		.execute(
+			"
+		CREATE TABLE IF NOT EXISTS sensor_readings(
+			time INTEGER PRIMARY KEY,
+			humidity INTEGER NOT NULL,
+			celsius INTEGER NOT NULL
+		)",
+			[],
+		)
+		.unwrap();
+
+	let mut chip = Chip::new("/dev/gpiochip0").unwrap();
+	let line = chip.get_line(26).unwrap();
+	let mut attempts = 0;
+	let mut temps = vec![];
+	let mut rhs = vec![];
+	let time = std::time::SystemTime::now()
+		.duration_since(SystemTime::UNIX_EPOCH)
+		.unwrap();
+	while temps.len() < 5 && attempts < 10 {
+		if let Ok((rh, temp)) = raspi_oled::am2302_reading(&line) {
+			if rh > 0 && temp < 500 {
+				rhs.push(rh);
+				temps.push(temp);
+			}
+		}
+		std::thread::sleep(Duration::from_secs(5));
+		attempts += 1;
+	}
+	if !temps.is_empty() {
+		// median = hopefully no faulty readings
+		temps.sort();
+		rhs.sort();
+		database
+			.execute(
+				"INSERT INTO sensor_readings (time, humidity, celsius) VALUES (?1, ?2, ?3)",
+				params![time.as_secs(), rhs[rhs.len() / 2], temps[temps.len() / 2]],
+			)
+			.unwrap();
+	}
+}

src/main.rs

@@ -1,3 +1,110 @@
+use embedded_graphics::{
+	draw_target::DrawTarget,
+	pixelcolor::BinaryColor,
+	prelude::{OriginDimensions, Size},
+	primitives::Rectangle,
+};
+use image::{ImageBuffer, Rgb};
+use rusqlite::Connection;
+
+struct FrameOutput {
+	buffer: ImageBuffer<Rgb<u8>, Vec<u8>>,
+}
+
+impl DrawTarget for FrameOutput {
+	type Color = BinaryColor;
+
+	type Error = ();
+
+	fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
+	where
+		I: IntoIterator<Item = embedded_graphics::Pixel<Self::Color>>,
+	{
+		for pos in pixels {
+			if pos.0.x < 0 || pos.0.y < 0 || pos.0.x >= 128 || pos.0.y >= 64 {
+				continue;
+			}
+			let color = if pos.1 == BinaryColor::On {
+				Rgb([0, 255, 255])
+			} else {
+				Rgb([0, 0, 0])
+			};
+			self.buffer.put_pixel(pos.0.x as u32, pos.0.y as u32, color);
+		}
+		Ok(())
+	}
+}
+
+impl OriginDimensions for FrameOutput {
+	fn size(&self) -> Size {
+		Size::new(self.buffer.width(), self.buffer.height())
+	}
+}
+
+fn main() {
+	let args = std::env::args().collect::<Vec<_>>();
+	if args.len() < 2 {
+		panic!("missing argument: database path");
+	}
+
+	let mut disp = FrameOutput {
+		buffer: ImageBuffer::new(128, 64),
+	};
+
+	let database = Connection::open(&args[1]).expect("failed to open database");
+
+	let mut query = database
+		.prepare("SELECT celsius FROM sensor_readings ORDER BY sensor_readings.time DESC LIMIT 288")
+		.unwrap();
+	let mut temps: Vec<i32> = query
+		.query_map([], |r| Ok(r.get(0)))
+		.unwrap()
+		.map(Result::unwrap)
+		.map(Result::unwrap)
+		.collect();
+	let mut global_min = 1000;
+	let mut global_max = 0;
+	let mut vals: Vec<(i32, i32)> = vec![];
+	for hour in temps.chunks_mut(6) {
+		hour.sort();
+		let min = hour[1];
+		let mut max = hour[hour.len() - 2];
+		println!("min {} max {}", min, max);
+		// sanity check value
+		if max > 300 {
+			if vals.is_empty() {
+				max = min;
+			} else {
+				max = vals.last().unwrap().1;
+			}
+		}
+
+		global_min = min.min(global_min);
+		global_max = max.max(global_max);
+		vals.push((min, max));
+	}
+	println!("global {} | {}", global_min, global_max);
+	let diff = global_max - global_min;
+	let x = 1;
+	let y = 1;
+	let scaley = 64;
+	let scalex = 2;
+	vals.reverse();
+	for (i, (a, b)) in vals.into_iter().enumerate() {
+		let x = x + i as i32 * scalex;
+		let y1 = y + (global_max - b) * scaley / diff;
+		let y2 = y + (global_max - a) * scaley / diff;
+		let height = y2 - y1 + 1;
+		disp.fill_solid(
+			&Rectangle::new((x, y1).into(), (scalex as u32, height as u32).into()),
+			BinaryColor::On,
+		)
+		.unwrap();
+	}
+
+	disp.buffer.save("/tmp/frame.png").unwrap();
+}
+/*
 use dht_hal::{Dht22, Reading};
 use embedded_graphics::image::{Image, ImageRaw};
 use embedded_graphics::mono_font::iso_8859_7::FONT_9X18;
@@ -289,3 +396,4 @@ impl OutputPin for LineWrapper {
 			.set_value(1)
 	}
 }
+*/