35 lines
1009 B
Python
35 lines
1009 B
Python
import machine
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import utime
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sensor_temp = machine.ADC(machine.ADC.CORE_TEMP)
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conversion_factor = 3.3 / (65535)
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led_onboard = machine.Pin(25, machine.Pin.OUT)
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led_onboard.value(0)
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rtc=machine.RTC()
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file = open("temps.txt", "w")
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#file = open("temps.txt", "a") # To append to log file rather than overwrite
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while True:
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reading = sensor_temp.read_u16() * conversion_factor
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timestamp=rtc.datetime()
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temperature = 27 - (reading - 0.706)/0.001721
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timestring="%04d-%02d-%02d %02d:%02d:%02d"%(timestamp[0:3] +
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timestamp[4:7])
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file.write(timestring + "," + str(temperature) + "\n")
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file.flush()
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led_onboard.value(1)
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utime.sleep(0.01)
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led_onboard.value(0)
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utime.sleep(30)
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# Notes
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# Given that space is at a premium when writing logs to files on the
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# internal Flash, one option may be produce timestamps and then deltas or
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# changes after that, forcing a full timestamp every so often to ensure
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# things are synchronised
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