88 lines
2.6 KiB
TypeScript
88 lines
2.6 KiB
TypeScript
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namespace grove
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{
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export namespace sensors
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{
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export class AHT20
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{
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public constructor(address: number = 0x38)
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{
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this._Address = address;
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}
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public Initialization(): AHT20
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{
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const buf = pins.createBuffer(3);
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buf[0] = 0xbe;
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buf[1] = 0x08;
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buf[2] = 0x00;
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pins.i2cWriteBuffer(this._Address, buf, false);
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basic.pause(10);
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return this;
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}
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public TriggerMeasurement(): AHT20
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{
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const buf = pins.createBuffer(3);
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buf[0] = 0xac;
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buf[1] = 0x33;
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buf[2] = 0x00;
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pins.i2cWriteBuffer(this._Address, buf, false);
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basic.pause(80);
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return this;
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}
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public GetState(): { Busy: boolean, Calibrated: boolean }
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{
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const buf = pins.i2cReadBuffer(this._Address, 1, false);
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const busy = buf[0] & 0x80 ? true : false;
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const calibrated = buf[0] & 0x08 ? true : false;
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return { Busy: busy, Calibrated: calibrated };
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}
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public Read(): { Humidity: number, Temperature: number }
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{
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const buf = pins.i2cReadBuffer(this._Address, 7, false);
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const crc8 = AHT20.CalcCRC8(buf, 0, 6);
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if (buf[6] != crc8) return null;
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const humidity = ((buf[1] << 12) + (buf[2] << 4) + (buf[3] >> 4)) * 100 / 1048576;
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const temperature = (((buf[3] & 0x0f) << 16) + (buf[4] << 8) + buf[5]) * 200 / 1048576 - 50;
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return { Humidity: humidity, Temperature: temperature };
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}
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private _Address: number;
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private static CalcCRC8(buf: Buffer, offset: number, size: number): number
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{
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let crc8 = 0xff;
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for (let i = 0; i < size; ++i)
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{
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crc8 ^= buf[offset + i];
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for (let j = 0; j < 8; ++j)
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{
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if (crc8 & 0x80)
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{
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crc8 <<= 1;
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crc8 ^= 0x31;
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}
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else
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{
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crc8 <<= 1;
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}
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crc8 &= 0xff;
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}
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}
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return crc8;
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}
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}
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}
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}
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