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SI7021 with no library

is I2C temperature and humidity sensor from Silicon Labs. I use their other products, like SI7051, which is very good temparature sensor.

You can get SI7021 from Ebay for very little money. The 7021 is typ ±0.3°C (±0.4 max) from –10 °C to +85 °C. And a bit worse beyond that. Not bad at all!

As for humidity does, it is ±2% RH (±3% RH (max)), 0–80% RH, and additional, up 1.5%, when RH goes from 80% to 100%.

I2C scanner sketch shows sensor at 0x40 (One thing I don't like is that all this sensors have the same and only one address of 0x40)

As far as sketch goes, I found one that has no library.

SI7021 sketch

SI7021 visits:

Application Note on bridging audio amplifiers

A discussion on bridging audio amplifier circuits like LM3886. Includes a schematic to drive a matched pair of amplifiers in a bridged configuration, power supply considerations for LM3886 and TDA1514 power amplifier circuits-especially in bridged pairs.

Application Note on parallel-bridging LM3886 audio amplifiers

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.

My first car audio system My second car audio system My third car audio system
Click HERE or to My Projects to see what I did for myself

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