remove loop from module, use channel 7

modules/weight.py

@@ -0,0 +1,14 @@
+#!/usr/bin/python
+
+import spidev
+import time
+import os
+
+spi = spidev.SpiDev()
+spi.open(0, 0)
+
+def readchannel(channel):
+	adc = spi.xfer2([1, (8+channel)<<4, 0])
+	data = ((adc[1]&3)<<8) + adc[2]
+	return data
+