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Temp fix

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This commit is contained in:
Zakary Timson 2024-10-30 11:03:30 -04:00
parent 72800546a8
commit 1de19b208a
2 changed files with 11 additions and 22 deletions
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21
src/bme.js
View File

@ -1,21 +0,0 @@
import i2c from 'i2c-bus';
export async function bme(address = 0x76) {
const i2cBus = await i2c.openPromisified(1);
const data = await Promise.all([
i2cBus.readByte(address, 0xFA),
i2cBus.readByte(address, 0xFB),
i2cBus.readByte(address, 0xFC),
i2cBus.readByte(address, 0xF7),
i2cBus.readByte(address, 0xF8),
i2cBus.readByte(address, 0xF9),
i2cBus.readByte(address, 0xFD),
i2cBus.readByte(address, 0xFE),
]);
return {
temperature: (((data[0] << 12) | (data[1] << 4) | (data[2] >> 4)) / 16384.0 - 5120.0) / 100,
pressure: ((data[3] << 12) | (data[4] << 4) | (data[5] >> 4)) / 25600,
humidity: ((data[6] << 8) | data[7]) / 1024.0,
};
}
console.log(await bme());

12
src/bme280.js
View File

@ -12,8 +12,18 @@ export async function bme(address = 0x76) {
i2cBus.readByte(address, 0xFD),
i2cBus.readByte(address, 0xFE),
]);
const T1 = 27504;
const T2 = 26435;
const T3 = -1000;
const rawTemp = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
let var1 = (((rawTemp >> 3) - (T1 << 1)) * T2) / 2048;
let var2 = (((((rawTemp >> 4) - T1) * ((rawTemp >> 4) - T1)) >> 12) * T3) / 16384;
let temp = (var1 + var2) / 5120.0;
return {
temperature: (((data[0] << 12) | (data[1] << 4) | (data[2] >> 4)) / 16384.0 - 5120.0) / 100,
temperature: temp,
pressure: ((data[3] << 12) | (data[4] << 4) | (data[5] >> 4)) / 25600,
humidity: ((data[6] << 8) | data[7]) / 1024.0,
};