tutorials:learn:scale:index.html
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tutorials:learn:scale:index.html [2011/03/30 21:56] daigo |
tutorials:learn:scale:index.html [2016/01/28 18:05] (current) |
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| We like to use python for its cross-platform compatibility. You'll need to install **pySerial** extension to access the serial port. Under windows the **COM port **will be whatever the USB adapter shows up as or **COM1** or **COM2** if using the built-in ports. For Macs/Linux check under **/dev/cu* **or **/dev/ttyusb*** - or run **dmesg** after plugging in the adapter for hints about what the device is called | We like to use python for its cross-platform compatibility. You'll need to install **pySerial** extension to access the serial port. Under windows the **COM port **will be whatever the USB adapter shows up as or **COM1** or **COM2** if using the built-in ports. For Macs/Linux check under **/dev/cu* **or **/dev/ttyusb*** - or run **dmesg** after plugging in the adapter for hints about what the device is called | ||
| - | <code C>SERIALPORT = "COM1" # this uses pySerial found here http://pyserial.sourceforge.net/# it currently exists for python 2.5import serialser = serial.Serial(SERIALPORT, 2400, timeout=1)while True:while True:x = ser.read()if (ord(x) == 13):breakstart = ord(ser.read()) # this is always 2 if the scale is on (i think - not totally sure what this is)mode = ord(ser.read()) # 176 = oz/lbs #192 = gramsnonce1 = ord(ser.read())nonce2 = ord(ser.read())if start != 2 or nonce1 != 128 or nonce2 != 128:continuevalue0 = int(ser.read()) # only used for lbs * 10value1 = int(ser.read())value2 = int(ser.read())value3 = int(ser.read())value4 = int(ser.read())if mode == 176: #ozweight = ((value0 * 10 + value1) * 16) + (value2 * 10 + value3) + (value4 * 0.1)unit = 'oz'elif mode == 192: #gramsweight = value1 * 1000 + value2 * 100 + value3 * 10 + value4 unit = 'g'print str(weight) + unit ser.close()</code> | + | <code python> |
| + | SERIALPORT = "COM1" | ||
| + | # this uses pySerial found here http://pyserial.sourceforge.net/ | ||
| + | # it currently exists for python 2.5 | ||
| + | import serialser = serial.Serial(SERIALPORT, 2400, timeout=1) | ||
| + | while True: | ||
| + | while True:x = ser.read() | ||
| + | if (ord(x) == 13): | ||
| + | breakstart = ord(ser.read()) # this is always 2 if the scale is on (i think - not totally sure what this is) | ||
| + | mode = ord(ser.read()) # 176 = oz/lbs #192 = grams | ||
| + | nonce1 = ord(ser.read()) | ||
| + | nonce2 = ord(ser.read()) | ||
| + | if start != 2 or nonce1 != 128 or nonce2 != 128: | ||
| + | continue | ||
| + | value0 = int(ser.read()) # only used for lbs * 10 | ||
| + | value1 = int(ser.read()) | ||
| + | value2 = int(ser.read()) | ||
| + | value3 = int(ser.read()) | ||
| + | value4 = int(ser.read()) | ||
| + | if mode == 176: #oz | ||
| + | weight = ((value0 * 10 + value1) * 16) + (value2 * 10 + value3) + (value4 * 0.1) | ||
| + | unit = 'oz' | ||
| + | elif mode == 192: #grams | ||
| + | weight = value1 * 1000 + value2 * 100 + value3 * 10 + value4 | ||
| + | unit = 'g' | ||
| + | print str(weight) + unit | ||
| + | ser.close() | ||
| + | </code> | ||
| ==== Larger scales ==== | ==== Larger scales ==== | ||
| Line 132: | Line 160: | ||
| - | ==== Downloads ==== | + | ==== Download ==== |
| *[[http://www.adafruit.com/datasheets/HD-Manual.pdf|Manual for HD-150 ]](150 lb max scale) | *[[http://www.adafruit.com/datasheets/HD-Manual.pdf|Manual for HD-150 ]](150 lb max scale) | ||
| *[[http://www.adafruit.com/datasheets/7010SB_U.pdf|Manual for 7010SB]] (10 lb max scale) | *[[http://www.adafruit.com/datasheets/7010SB_U.pdf|Manual for 7010SB]] (10 lb max scale) | ||
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