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July 24, 2015 20:11
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I2C soil moisture sensor with RaspberryPi
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| #!/usr/bin/python | |
| # cannot use python3 because smbus not working there | |
| # Modified script from https://github.com/JasperWallace/chirp-graphite/blob/master/chirp.py | |
| # by DanielTamm | |
| import smbus, time, sys | |
| class Chirp: | |
| def __init__(self, bus=1, address=0x20): | |
| self.bus_num = bus | |
| self.bus = smbus.SMBus(bus) | |
| self.address = address | |
| def get_reg(self, reg): | |
| # read 2 bytes from register | |
| val = self.bus.read_word_data(self.address, reg) | |
| # return swapped bytes (they come in wrong order) | |
| return (val >> 8) + ((val & 0xFF) << 8) | |
| def reset(self): | |
| # To reset the sensor, write 6 to the device I2C address | |
| self.bus.write_byte(self.address, 6) | |
| def set_addr(self, new_addr): | |
| # To change the I2C address of the sensor, write a new address | |
| # (one byte [1..127]) to register 1; the new address will take effect after reset | |
| self.bus.write_byte_data(self.address, 1, new_addr) | |
| self.reset() | |
| self.address = new_addr | |
| def moist(self): | |
| # To read soil moisture, read 2 bytes from register 0 | |
| return self.get_reg(0) | |
| def temp(self): | |
| # To read temperature, read 2 bytes from register 5 | |
| return self.get_reg(5) | |
| def light(self): | |
| # To read light level, start measurement by writing 3 to the | |
| # device I2C address, wait for 3 seconds, read 2 bytes from register 4 | |
| self.bus.write_byte(self.address, 3) | |
| time.sleep(1.5) | |
| return self.get_reg(4) | |
| def __repr__(self): | |
| return "<Chirp sensor on bus %d, addr %d>" % (self.bus_num, self.address) | |
| if __name__ == "__main__": | |
| addr = 0x20 | |
| if len(sys.argv) == 2: | |
| if sys.argv[1].startswith("0x"): | |
| addr = int(sys.argv[1], 16) | |
| else: | |
| addr = int(sys.argv[1]) | |
| chirp = Chirp(1, addr) | |
| print chirp | |
| print "Moisture\tTemperature\tBrightness" | |
| while True: | |
| print "%d\t%d\t%d" % (chirp.moist(), chirp.temp(), chirp.light()) | |
| time.sleep(1) |
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