Vladimir Akopyan
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
--- /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;
+ }
+}
+
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