Chirp is a great little soil moisture sensor. This is a library for the Chirp soil moisture sensor. It supports reading Capacitance (soil moisture) and soil temperature. You can get Chirp on Tindie https://www.tindie.com/products/miceuz/i2c-soil-moisture-sensor/ And read documentation on github https://www.tindie.com/products/miceuz/i2c-soil-moisture-sensor/
Diff: Chirp.cpp
- Revision:
- 0:6164b94deb27
- Child:
- 1:faff11456df9
diff -r 000000000000 -r 6164b94deb27 Chirp.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Chirp.cpp Thu Jan 12 22:01:43 2017 +0000 @@ -0,0 +1,48 @@ +#include "mbed.h" +#include "Chirp.h" + +//Chirp Docs are at https://github.com/Miceuz/i2c-moisture-sensor and https://www.tindie.com/products/miceuz/i2c-soil-moisture-sensor/ + +Chirp::Chirp(PinName sda, PinName scl, char slave_adr) + :i2c_p(new I2C(sda, scl)), i2c(*i2c_p), address(slave_adr) +{ + +} + +float Chirp::getCapacitance(){ + short capacitance = 0; + char i2cData[2]= {0}; + + char dataReg = 0; //Capacitance is stored in 2 bytes at address 0 + i2c.write(address, &dataReg, 1); + int success = i2c.read(address, i2cData, 2); + + if(success != 0) + return -1000000; + else + { + //I2C bytes are in different byte order, write into short bytes 0 and 1 in reverse order! + *((char*)&capacitance) = i2cData[1]; + *(((char*)(&capacitance)) + 1) = i2cData[0]; + return capacitance; + } +} + +float Chirp::getTemperature(){ + short temperature = 0; + char i2cData[2]= {0}; + + char dataReg = 5; //Temperature is stored in 2 bytes at address 5 + i2c.write(address, &dataReg, 1); + int success = i2c.read(address, i2cData, 2); + + if(success != 0) + return -1000000; + else + { + *((char*)&temperature) = i2cData[1]; + *(((char*)(&temperature)) + 1) = i2cData[0]; + return (float) temperature / 10.0; + } +} + \ No newline at end of file