Sending integer values to Arduino from PySerial?

Encode them into binary strings with Python's struct module. I don't know if arduino wants them little-endian or big-endian, but, if its docs aren't clear about this, a little experiment should easily settle the question;-).

Note: Arduino is little endian. You can swap endianess using struct module, I didn't have to though. Just for the record, I was on intel x86 mac osx 10.6.4.

Python 2.6.1, 64 bit. – toddstavish Aug 18 '10 at 12:50.

Here's how (Thanks for the idea, Alex! ): Python: def packIntegerAsULong(value): """Packs a python 4 byte unsigned integer to an arduino unsigned long""" return struct. Pack('I', value) #should check bounds # To see what it looks like on python side val = 15000 print binascii.

Hexlify(port. PackIntegerAsULong(val)) # send and receive via pyserial ser = serial. Serial(serialport, bps, timeout=1) ser.

Write(packIntegerAsULong(val)) line = ser.readLine() print line Arduino: unsigned long readULongFromBytes() { union u_tag { byte b4; unsigned long ulval; } u; u. B0 = Serial.read(); u. B1 = Serial.read(); u.

B2 = Serial.read(); u. B3 = Serial.read(); return u. Ulval; } unsigned long val = readULongFromBytes(); Serial.

Print(val, DEC); // send to python to check.

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