Hi there~
It is related with GrovePi+ firmware issue. Please follow below instruction to update the firmware. thanks.
[code]pi@dex:~/Dexter/GrovePi/Firmware $ sudo ./firmware_update.sh
Updating the GrovePi firmware
http://www.dexterindustries.com/grovepi
Run this program:
sudo ./firmware_update.sh
=============================
Do you want to update the firmware? [y,n]y
Make sure that GrovePi is connected to Raspberry Pi
Firmware found
Press any key to start firmware update
. . .
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f
avrdude: reading input file “0xFF”
avrdude: writing lfuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xFF:
avrdude: load data lfuse data from input file 0xFF:
avrdude: input file 0xFF contains 1 bytes
avrdude: reading on-chip lfuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying …
avrdude: 1 bytes of lfuse verified
avrdude: safemode: Fuses OK
avrdude done. Thank you.
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f
avrdude: reading input file “0xDA”
avrdude: writing hfuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xDA:
avrdude: load data hfuse data from input file 0xDA:
avrdude: input file 0xDA contains 1 bytes
avrdude: reading on-chip hfuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying …
avrdude: 1 bytes of hfuse verified
avrdude: safemode: Fuses OK
avrdude done. Thank you.
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f
avrdude: reading input file “0x05”
avrdude: writing efuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0x05:
avrdude: load data efuse data from input file 0x05:
avrdude: input file 0x05 contains 1 bytes
avrdude: reading on-chip efuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying …
avrdude: 1 bytes of efuse verified
avrdude: safemode: Fuses OK
avrdude done. Thank you.
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file “grove_pi_firmware.hex”
avrdude: input file grove_pi_firmware.hex auto detected as Intel Hex
avrdude: writing flash (18860 bytes):
Writing | ################################################## | 100% 5.48s
avrdude: 18860 bytes of flash written
avrdude: verifying flash memory against grove_pi_firmware.hex:
avrdude: load data flash data from input file grove_pi_firmware.hex:
avrdude: input file grove_pi_firmware.hex auto detected as Intel Hex
avrdude: input file grove_pi_firmware.hex contains 18860 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 4.73s
avrdude: verifying …
avrdude: 18860 bytes of flash verified
avrdude: safemode: Fuses OK
avrdude done. Thank you.
pi@dex:~/Dexter/GrovePi/Firmware $ ccd …/Software/Python/
pi@dex:~/Dexter/GrovePi/Software/Python $ python grove_gas_sensor.py
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 1, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 680, ’ density =’, 0.0)
(‘sensor_value =’, 689, ’ density =’, 0.0)
(‘sensor_value =’, 672, ’ density =’, 0.0)
(‘sensor_value =’, 640, ’ density =’, 0.0)
(‘sensor_value =’, 551, ’ density =’, 0.0)
(‘sensor_value =’, 688, ’ density =’, 0.0)
(‘sensor_value =’, 689, ’ density =’, 0.0)
(‘sensor_value =’, 689, ’ density =’, 0.0)
(‘sensor_value =’, 690, ’ density =’, 0.0)
(‘sensor_value =’, 680, ’ density =’, 0.0)
(‘sensor_value =’, 692, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)
(‘sensor_value =’, 0, ’ density =’, 0.0)[/code]