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%title: tomato base %author: imw %date: 2022-08-12

-> tomato base <-

-> the seat cushion that tells you when you get off your can <-

-> # this <-

  • hardware
  • software
  • approaches
  • results
  • questions

-> # hardware <-

  • bbc microbit v2
  • plug board
  • bread board
  • 2x joy-it SEN-PRESSURE10
  • jumpers

-> # software <-

  • rust
  • nrf-rs community tools
  • cargo embed
  • gdb-multiarch

-> # approaches - basic i/o <-

let pressure1 = adc.read(&mut adc_pin1).unwrap(); let pressure2 = adc.read(&mut adc_pin2).unwrap(); let mut q1 = pressure1 / 3000; let mut q2 = pressure2 / 3000; for i in 0..5 { let mut row = leds[i]; ... } display.show(&mut timer, leds, 500);

-> # approaches - timing and interrupts <-

static RTC: Mutex<RefCell<Option<Rtcpac::RTC0>>> = Mutex::new(RefCell::new(None)); static SPEAKER: Mutex<RefCell<Option<pwm::Pwmpac::PWM0>>> = Mutex::new(RefCell::new(None)); static ADC: Mutex<RefCell<Option>> = Mutex::new(RefCell::new(None)); ... unsafe { pac::NVIC::unmask(pac::Interrupt::RTC0); }
pac::NVIC::unpend(pac::Interrupt::RTC0); ... fn RTC0() { static mut FREQUENCY: u32 = 1; /* Enter critical section / cortex_m::interrupt::free(|cs| { / Borrow devices */ if let (Some(speaker), Some(rtc),Some(adc)) = ( SPEAKER.borrow(cs).borrow().as_ref(), RTC.borrow(cs).borrow().as_ref(), ADC.borrow(cs).borrow().as_ref(), ) { ... }

-> # approaches - rtc.wait() <- let expired = timer0.wait(); let sat_upon = q1 > 0 || q2 > 0; match expired { Err() => { if sat_upon { timer0.start(alarm_period); alarm = false; } else { alarm = true; } } Ok() => { continue } } ...

-> # approaches - rtc.read() <-

let sat_upon = q1 > 0 || q2 > 0; if !sat_upon { last_stand = rtc.get_counter(); }

let time = rtc.get_counter(); if time - last_stand > alarm_period { alarm = true } else { alarm = false }

-> # results <-

-> ## live demo <-

-> # questions <-

  • what would a good enclosure look like?
  • how to attach sensors well?
  • what about a version with linqstat?
  • what about a standing desk integration
  • how to add cooling
  • how to add haptics