def ir_read_signal():
	try:
		write_i2c_block(address,ir_read_cmd+[unused,unused,unused])
		time.sleep(.1)
		data_back= bus.read_i2c_block_data(address, 1)[0:21]
		if (data_back[1]!=255):
			return data_back
		return [-1]*21
	except __HOLE__:
		return [-1]*21
		
# Grove - Infrared Receiver- set the pin on which the Grove IR sensor is connected
dataset/ETHPy150Open DexterInd/GrovePi/Firmware/Source/v1.2/grove_pi_v1_2_6/grovepi.py/ir_read_signal