AM2320 library
Dependents: mbed_AM2320 Fungi Fungi Nucleo_SSD1306_DS1302_ESP8266_AM2320_BME280 ... more
See http://developer.mbed.org/users/yasuyuki/notebook/AM2320/
AM2320.cpp
- Committer:
- yasuyuki
- Date:
- 2015-03-14
- Revision:
- 0:2cb35c995095
- Child:
- 1:766868b34d56
File content as of revision 0:2cb35c995095:
//********************** // AM2320.cpp for mbed // // AM2320 am2320(P0_5,P0_4); // or // I2C i2c(P0_5,P0_4); // AM2320 am2320(i2c); // // (C)Copyright 2015 All rights reserved by Y.Onodera // http://einstlab.web.fc2.com //********************** #include "mbed.h" #include "AM2320.h" AM2320::AM2320 (PinName sda, PinName scl) : _i2c(sda, scl) { } AM2320::AM2320 (I2C& p_i2c) : _i2c(p_i2c) { } void AM2320::get() { // step 1:wakeup _i2c.write(AM2320_ADDR, NULL, 0); wait_us(800); // 800us - 3ms // step 2:command buf[0] = 0x03; // Get Humidity and Temperature buf[1] = 0x00; // Start address buf[2] = 0x04; // Length _i2c.write(AM2320_ADDR, buf, 3); wait_us(1500); // 1.5ms // step 3:data _i2c.read( AM2320_ADDR, buf, 8); } int AM2320::humidity() { // get hum get(); hum.byte.HB=buf[2]; hum.byte.LB=buf[3]; return hum.Val; } int AM2320::temperature() { // get temp get(); temp.byte.HB=buf[4]; temp.byte.LB=buf[5]; return temp.Val; }