Raspberry Pi Zero GPIO 擴展板
3.3V VCC
GND GND
GPIO2 CH1
GPIO3 CH2
GPIO4 CH3
GPIO14 CLK
GPIO15 DAT
以下是示波器的程式碼：
python
import RPi.GPIO as GPIO
import spidev
import time
import numpy as np
import matplotlib.pyplot as plt
# Set up GPIO pins
GPIO.setmode(GPIO.BCM)
GPIO.setup(2, GPIO.IN)
GPIO.setup(3, GPIO.IN)
GPIO.setup(4, GPIO.IN)
# Set up SPI
spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 500000
# Set up variables
samples = 1000
interval = 0.001
times = np.arange(0, samples * interval, interval)
# Read data from SPI
def read_spi(channel):
adc = spi.xfer2([1, (8 + channel) << 4, 0])
data = ((adc[1] & 3) << 8) + adc[2]
return data
# Read data from channels
def read_channel(channel):
values = []
for i in range(samples):
value = read_spi(channel)
values.append(value)
time.sleep(interval)
return values
# Plot data from channels
def plot_channels():
ch1_values = read_channel(0)
ch2_values = read_channel(1)
ch3_values = read_channel(2)