from machine import Pin, I2C
from ads1115 import ADS1115

# 初始化I2C（SDA=4, SCL=5, 400KHz）
i2c = I2C(id=0, sda=Pin(4), scl=Pin(5), freq=400000)
# 扫描I2C总线获取设备地址
ADC_ADDRESS = i2c.scan()[0]
# 初始化ADS1115（增益1x，±4.096V）
adc = ADS1115(i2c, ADC_ADDRESS, 1)

from machine import Pin, I2C, Timer, UART
import time
from ads1115 import ADS1115
import struct

# 全局变量
ADC_ADDRESS = 0
POT_CHANNEL = 0  # 电位器连接AIN0
FILTER_SIZE = 20
filter_buffer = []
filter_sum = 0

# 定时器回调：定时采集ADC数据
def timer_callback(timer):
    global adc, POT_CHANNEL, FILTER_SIZE
    try:
        # 设置860 SPS采样率，采集AIN0通道
        adc.set_conv(rate=7, channel1=POT_CHANNEL)
        raw_adc = adc.read_rev()
        voltage = adc.raw_to_v(raw_adc)
        print(f"Channel AIN{POT_CHANNEL}: {voltage:.4f} V (Raw: {raw_adc})")

        # 滑动均值滤波
        average = moving_average_filter(raw_adc, FILTER_SIZE)
        # 串口发送数据帧
        send_data_frames(raw_adc, average)
    except Exception as e:
        print("Error in timer_callback:", e)

# 串口数据帧发送
def send_data_frames(raw_adc, average):
    global uart
    try:
        # 帧头0xAA 0xBB + 原始值 + 滤波值（小端模式）
        frame_header = struct.pack('<2B', 0xAA, 0xBB)
        frame_data = struct.pack('<2H', raw_adc & 0xFFFF, average & 0xFFFF)
        uart.write(frame_header + frame_data)
    except Exception as e:
        print("Error in send_data_frames:", e)

# 滑动均值滤波
def moving_average_filter(new_value, filter_size):
    global filter_buffer, filter_sum
    filter_buffer.append(new_value)
    filter_sum += new_value
    if len(filter_buffer) > filter_size:
        removed = filter_buffer.pop(0)
        filter_sum -= removed
    return filter_sum // len(filter_buffer)

# 初始化配置
time.sleep(3)
print("FreakStudio: Using ADS1115 acquire signal")

# 初始化UART（波特率256000）
uart = UART(0, 256000)
uart.init(baudrate=256000, bits=8, parity=None, stop=1, tx=0, rx=1, timeout=100)

# 初始化I2C（SDA=4, SCL=5, 400KHz）
i2c = I2C(id=0, sda=Pin(4), scl=Pin(5), freq=400000)
devices_list = i2c.scan()
print('i2c devices found:', len(devices_list))
for device in devices_list:
    print("ADC I2C address:", hex(device))
    ADC_ADDRESS = device

# 初始化ADS1115（增益1x，±4.096V）
adc = ADS1115(i2c, ADC_ADDRESS, 1)

# 初始化定时器（10ms周期，100Hz采集）
timer = Timer(-1)
timer.init(period=10, mode=Timer.PERIODIC, callback=timer_callback)

# 主循环
while True:
    time.sleep(1)

MIT License

Copyright (c) 2026 FreakStudio

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furnished to do so, subject to the following conditions:

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.