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• Temperature ​meter code added

  Arya • 07/23/2017 at 23:21 • 0 comments

  Our hackerspace had an old Pro Mini-based board with two DS18B20 sensors that used to measure temperature inside and outside our hackerspace's main room, mostly for shits&giggles. Now, I took the IMTAIDKW, attached those sensors to it and wrote some code: 

  def run(sleep_time=0.0001, cycle_counter=50000, update_counter=10000, format_counter=10010, trigger_counter=5000):
      #Good luck understanding this lol
      global thermometers, current_thermometer, is_error, digit_bytes
      print("Hello!")
      prev_i = 3
      run_counter = 0
      while True:
          for i, digit_byte in enumerate(digit_bytes):
              isr = machine.disable_irq()
              shiftOut(digit_byte)
              columns[prev_i].on()
              latch.on()
              columns[i].off()
              machine.enable_irq(isr)
              run_counter += 1
              if run_counter >= cycle_counter:
                 print("cycling through thermometers")
                 current_thermometer += 1
                 if current_thermometer >= len(thermometers):
                     current_thermometer = 0
                 print("current thermometer: {}".format(current_thermometer))
                 run_counter = 0
              elif run_counter % update_counter == 0:
                 print("getting temperature")
                 try:
                     temperature = ds.read_temp(thermometers[current_thermometer])
                 except (OneWireError, IndexError):
                     print("sensor {} failed".format(current_thermometer))
                     is_error = True
                 else:
                     temperatures[current_thermometer] = temperature
                 if is_error:
                     thermometers = ds.scan()
                     if not thermometers:
                         print("no sensors found!")
                         digit_bytes = [mapping[char] for char in " err"]
                     else:
                         is_error = False
              elif run_counter % format_counter == 0 and not is_error:
                 print("formatting temperatures for display")
                 temperature = temperatures[current_thermometer]
                 if type(temperature) != float:
                     print("wrong temperature {1} for sensor {0}!".format(current_thermometer, temp_str))
                 else:
                     temp_str = "{:.1f}".format(temperature)
                     print("sensor {} has temperature {}".format(current_thermometer, temp_str))
                     digit_bytes = generate_digit_bytes(temp_str, thermometers[current_thermometer])
              elif run_counter % trigger_counter == 0:
                 print("updating temperatures")
                 try:
                     ds.convert_temp()
                 except OneWireError:
                     is_error = True
                     thermometers = ds.scan()
                     if not thermometers:
                         print("no sensors found!")
                         digit_bytes = [mapping[char] for char in " err"]
                     else:
                         is_error = False
              sleep(sleep_time)
              prev_i = i
  

   .. Yeah, good luck reading that. The full code is here: https://github.com/CRImier/IMTAIDKW/blob/master/software/temperature_meter.py
  

  I also attached a light sensor to the analog port, but I don't feel like I can be arsed to write the code that does something useful with it. That's going to be it on IMTAIDKW for now!

  I'll add some photos of this setup later - though, frankly, I don't care enough, so it's unlikely I actually will.

• shiftOut ported to MicroPython Viper

  Arya • 07/09/2017 at 16:20 • 0 comments

  @micropython.viper
  def shiftOut(data: int):
      GPIO_OUT = ptr32(0x60000300) # GPIO base register
      GPIO_OUT[2] = 0x10 # clear pin 4
      for i in range(8):
          value = data & 1<<i #Is bit set or cleared?
          reg = 2-(value >>i) #Selecting set or clear register - clear reg is 2, set reg is 1
          GPIO_OUT[reg] = 0x8000 #set or clear data bit
          GPIO_OUT[1] = 0x20 # set bit 5
          GPIO_OUT[2] = 0x20 # clear bit 5

  instead of

  def shiftOut(byte):
      latch.off()
      for i in range(8):
          value = byte & 1<<i #Is bit set or cleared?
          data.value(value)
          clock.on()
          clock.off()

  Is it going to be faster? IDK, I asked about it on MicroPython forums to figure out - and also to make sure there are more Google-able examples of toggling GPIOs from Viper code. New example is here: https://github.com/CRImier/IMTAIDKW/blob/master/software/test_viper.py

• Test code is up

  Arya • 07/09/2017 at 14:27 • 0 comments

  I should probably add comments to it.

  https://github.com/CRImier/IMTAIDKW/blob/master/software/test.py

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