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MCP9808

is I2C temperature sensor from Microchip. I bought them from Farnell, they are just over 1€ on there.

The 9808 is ±0.25 (typical) from -40°C to +125°C. And ±0.5°C (maximum) from -20°C to 100°C. Not bad at all, another good one!

I has user-selectable measurement resolution down to 0.0625°C. At this resulution it takes 250mS to take sample.

• Operating Voltage Range: 2.7V to 5.5V
• Operating Current: 200 μA (typical)

I2C scanner sketch shows sensor at 0x18 and 0x1F (the way I configured my sensors). You can set many different addresses since you have 3 pins avaliable for setting it anywhere between 0x18 and 0x1F.

For library I searched for mcp9808 in Arduino IDE and use DHT11 from robin (yea I don't know why did he put DHT11 as name... but it is for mcp)

Example sketch has MCP9808 mcp = MCP9808(); in code, but if you have specific address like 0x1F, then you simply put that in:

MCP9808 mcp = MCP9808(0x1F);

I my two sketches, I use two sensor at the same time, one sketch does averaging.

MCP9808 sketch

MCP9808_avg sketch

MCP9808 visits:

How to make it loud - real loud. (230 watts rms into 8 ohms without clipping from 4 ICs. How to match LM3886s for parallel operation, then bridge the matched parallel banks. If you are not familiar with bridging amplifiers (BTL configuration), read the Application Note on bridging listed left in article Application Note on bridging audio amplifiers.