Description: This is the T5403 breakout board, a fully calibrated barometric pressure sensor with an I2C interface. The T5403 sensor measures the absolute pressure of the air around. This pressure varies with both the weather and altitude. Depending on how you interpret the data, you can monitor changes in the weather, measure altitude, or any other tasks that require an accurate pressure reading.
The T5403 sensor consists of a piezoresistive MEMS pressure sensor element and an ASIC (application specific integrated circuit) with integrated temperature sensor, analog to digital converter ADC, memory and digital circuitry. Each breakout requires a supply voltage of 1.7V to 3.6V with a low current consumption of 790µA max and each pin (GND, VCC, SCL/SCLK, SDA/MOSI, MISO, RST/&SS, SEL, and EOC) broken out.
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I am using this with two DS18B20 temp sensors and a MicroView as a weather station. MicroView shows indoor/outdoor temp and pressure. Added my Raspberry pi to catch the serial data from the MircoView and have it uploading to Weather Underground. I also have an Ambient Weather WS-1400-IP station I got as a birthday gift that uploads to WU. I have been comparing the temps and pressure plots between the two stations and the measurements are pretty close to the same. I did have to add a correction factor to get this one to match the pressure reading of the WS-1400-IP… using the example code with my altitude (8500 ft.) didn’t seem to get it quite right. Next step is adding the Si7021 humidity sensor which might be tomorrow’s task. Will review that one once I see how the plots compare.