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micropython-mcp9808

This repository contains a MicroPython "driver" implementation for the MCP9808 temperature sensor from Microchip.

Reading the temperature value in degree celsius. The get_temp() method supports floating point values and the get_temp_int() method does not use floating point arythmetic at all and does return a tuple of decimal and fraction parts of the temperature reading.
Shutdown mode to save power. When not in shutdown mode the sensor does draw 200-400 uA. Data acquisition can only be stopped in the so called "shutdown mode". In this mode communication is still possible using I2C.
Changing the data acquisition resolution and duration. On power up the sensor is set to maximum resolution.

Mode Name Resolution Duration Samples / sec
T_RES_MIN +-0.5 °C 30 ms 33
T_RES_LOW +-0.25 °C 65 ms 15
T_RES_AVG +-0.125 °C 130 ms 7
T_RES_MAX +-0.0625 °C 250 ms 4
Alert mode: boundaries are defined by using set_alert_boundary_temp(). set_alert_mode(self, enable_alert, output_mode, polarity, selector) allows to enable/disable alert functionality, set the desired output mode to comparator or interrupt, switch te polarity between active-low or active-high (pull-up resistor required!) as well as what boundaries should trigger an alert.

Mode Name	Resolution	Duration	Samples / sec
T_RES_MIN	+-0.5 °C	30 ms	33
T_RES_LOW	+-0.25 °C	65 ms	15
T_RES_AVG	+-0.125 °C	130 ms	7
T_RES_MAX	+-0.0625 °C	250 ms	4