Title: [Entry] Arbitrary Waveform Generator
Post by: NiHaoMike on October 19, 2012, 05:32:37 am
Post by: NiHaoMike on October 19, 2012, 05:32:37 am
This is really just for fun - it doesn't make a very good function generator by modern standards. (If I wanted something to actually use, I would start with a FPGA...) Apart from that, however, it can generate a number of waveforms that an old analog function generator cannot. It uses a PC with a serial port to supply the waveform data. (Once programmed, however, it will keep running without the PC until power is disconnected.)
http://http://i46.tinypic.com/2czykva.png
Here's the Python code I used to generate the waveform seen on the scope:
http://http://i46.tinypic.com/2czykva.png
Here's the Python code I used to generate the waveform seen on the scope:
Code: [Select]
import serial
import time
import math
import sys
s = serial.Serial(sys.argv[1],115200,8,'N',1,1,0,0)
time.sleep(0.5)
for x in range (0,32767):
y=chr(int(math.fabs(math.sin(x*math.pi/(pow(2,int(sys.argv[2])))))*127+128))
s.write(y)
for x in range (32768,65535):
y=chr(int(-math.fabs(math.sin(x*math.pi/(pow(2,int(sys.argv[2])))))*127+128))
s.write(y)
time.sleep(0.5)
s.setDTR(False)