45 lines
1.2 KiB
ReStructuredText
45 lines
1.2 KiB
ReStructuredText
MCP9808 Temperature Sensor
|
|
##########################
|
|
|
|
Overview
|
|
========
|
|
|
|
Sample application that periodically reads temperature from the MCP9808 sensor.
|
|
|
|
|
|
Requirements
|
|
============
|
|
|
|
The MCP9808 digital temperature sensor converts temperatures between -20°C and
|
|
+100°C to a digital word with ±0.5°C (max.) accuracy. It is I2C compatible and
|
|
supports up to 16 devices on the bus. We do not require pullup resistors on the
|
|
data or clock signals as they are already installed on the breakout board.
|
|
|
|
The MCP9808 is available in a discrete component form but it is much easier to
|
|
use it mounted on a breakout board. We used the Adafruit breakout board.
|
|
|
|
- `MCP9808 Sensor`_
|
|
|
|
This sample uses the sensor APIs and the provided driver for the MCP9808 sensor.
|
|
|
|
Wiring
|
|
=======
|
|
|
|
The MCP9808 requires 2 wires for the I2C bus plus power and ground. The power
|
|
can be either 5V or 3.3V.
|
|
|
|
We connect the Data and clock wires to Analog ports A4 and A5 which is the I2C
|
|
pins on Arduino compatible boards.
|
|
|
|
In this hookup we are only connecting one device to one of the supported boards.
|
|
It reads the temperature and displays it on the console.
|
|
|
|
|
|
References
|
|
===========
|
|
|
|
- http://www.microchip.com/wwwproducts/en/en556182
|
|
|
|
|
|
.. _`MCP9808 Sensor`: https://www.adafruit.com/product/1782
|