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‎MODBUS DS18B20 to 4-20mA Industrial Current Loop/I-V Receiver (ADC)/SH1107.py

+138
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from micropython import const
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import framebuf
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SH1107_I2C_address = const(0x3C)
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SH1107_SET_LOWER_COLUMN_ADDRESS = const(0x00)
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SH1107_SET_UPPER_COLUMN_ADDRESS = const(0x10)
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SH1107_SET_PAGE_MEMORY_ADDRESSING_MODE = const(0x20)
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SH1107_SET_VERTICAL_MEMORY_ADDRESSING_MODE = const(0x21)
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SH1107_SET_CONSTRAST_CONTROL = const(0x81)
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SH1107_SET_DC_DC_OFF_MODE = const(0x8A)
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SH1107_SET_DC_DC_ON_MODE = const(0x8B)
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SH1107_SET_SEGMENT_REMAP_NORMAL = const(0xA0)
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SH1107_SET_SEGMENT_REMAP_REVERSE = const(0xA1)
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SH1107_SET_ENTIRE_DISPLAY_OFF = const(0xA4)
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SH1107_SET_ENTIRE_DISPLAY_ON = const(0xA5)
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SH1107_SET_NORMAL_DISPLAY = const(0xA6)
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SH1107_SET_REVERSE_DISPLAY = const(0xA7)
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SH1107_SET_MULTIPLEX_RATIO = const(0xA8)
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SH1107_SET_DC_DC_CONTROL_MODE = const(0xAD)
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SH1107_DISPLAY_OFF = const(0xAE)
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SH1107_DISPLAY_ON = const(0xAF)
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SH1107_SET_PAGE_ADDRESS = const(0xB0)
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SH1107_SET_COMMON_OUTPUT_SCAN_DIRECTION = const(0xC0)
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SH1107_SET_DISPLAY_OFFSET = const(0xD3)
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SH1107_SET_DISPLAY_CLOCK_FREQUENCY = const(0xD5)
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SH1107_SET_PRECHARGE_DISCHARGE_PERIOD = const(0xD9)
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SH1107_SET_VCOM_DESELECT_LEVEL = const(0xDB)
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SH1107_SET_DISPLAY_START_LINE = const(0xDC)
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disp_width = const(128)
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disp_height = const(64)
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disp_pages = const((disp_height >> 3))
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class OLED(framebuf.FrameBuffer):
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def __init__(self, _i2c, _i2c_address = SH1107_I2C_address):
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self.width = disp_width
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self.height = disp_height
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self.pages = disp_pages
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self.line_bytes = (self.width >> 3)
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size = (self.width * self.pages)
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self.curr_buffer = bytearray(b'\x00' * size)
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self.prev_buffer = bytearray(b'\xFF' * size)
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self.write_list = [b"\x40", None]
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self.temp = bytearray(0x02)
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self.WHITE = 1
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self.BLACK = 0
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self.i2c = _i2c
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self.i2c_addr = _i2c_address
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super().__init__(self.curr_buffer, self.width, self.height, framebuf.MONO_HMSB)
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self.init_display()
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def write_command(self, cmd):
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self.temp[0] = 0x80
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self.temp[1] = cmd
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self.i2c.writeto(self.i2c_addr, self.temp)
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def write_data(self, data_buffer):
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self.write_list[1] = data_buffer
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self.i2c.writevto(self.i2c_addr, self.write_list)
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def init_display(self):
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self.write_command(SH1107_DISPLAY_OFF)
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self.write_command(SH1107_SET_LOWER_COLUMN_ADDRESS)
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self.write_command(SH1107_SET_UPPER_COLUMN_ADDRESS)
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self.write_command(SH1107_SET_PAGE_ADDRESS)
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self.write_command(SH1107_SET_DISPLAY_START_LINE)
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self.write_command(0x00)
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self.write_command(SH1107_SET_CONSTRAST_CONTROL)
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self.write_command(0x44)
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self.write_command(SH1107_SET_VERTICAL_MEMORY_ADDRESSING_MODE)
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self.write_command(SH1107_SET_SEGMENT_REMAP_REVERSE)
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self.write_command(SH1107_SET_COMMON_OUTPUT_SCAN_DIRECTION)
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self.write_command(SH1107_SET_ENTIRE_DISPLAY_OFF)
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self.write_command(SH1107_SET_NORMAL_DISPLAY)
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self.write_command(SH1107_SET_MULTIPLEX_RATIO)
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self.write_command(0x7F)
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self.write_command(SH1107_SET_DISPLAY_OFFSET)
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self.write_command(0x60)
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self.write_command(SH1107_SET_DISPLAY_CLOCK_FREQUENCY)
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self.write_command(0x81)
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self.write_command(SH1107_SET_PRECHARGE_DISCHARGE_PERIOD)
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self.write_command(0x22)
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self.write_command(SH1107_SET_VCOM_DESELECT_LEVEL)
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self.write_command(0x35)
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self.write_command(SH1107_SET_DC_DC_CONTROL_MODE)
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self.write_command(SH1107_SET_DC_DC_OFF_MODE)
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self.write_command(SH1107_DISPLAY_ON)
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def modify_buf(self, offs, width):
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ptr = offs
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width += offs
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while(ptr < width):
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while((ptr < width) and (self.curr_buffer[ptr : (ptr + 0x08)] == self.prev_buffer[ptr : (ptr + 0x08)])):
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ptr += 0x08
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if(ptr < width):
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first = ptr
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ptr += 0x08
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while((ptr < width) and (self.curr_buffer[ptr : (ptr + 0x08)] != self.prev_buffer[ptr : (ptr + 0x08)])):
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ptr += 0x08
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yield first, ptr
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ptr += 0x08
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def show(self):
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for col in range(self.height):
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noffs = (col * self.line_bytes)
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for page1, page2 in self.modify_buf(noffs, self.line_bytes):
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self.write_command(SH1107_SET_PAGE_ADDRESS | (page1 - noffs))
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self.write_command(SH1107_SET_LOWER_COLUMN_ADDRESS | (col & 0x0F))
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self.write_command(SH1107_SET_UPPER_COLUMN_ADDRESS | ((col & 0x70) >> 0x04))
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self.write_data(self.curr_buffer[page1 : page2])

‎MODBUS DS18B20 to 4-20mA Industrial Current Loop/I-V Receiver (ADC)/main.py

+75
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from pyb import Pin, ADC
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from machine import I2C
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from SH1107 import OLED
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from utime import sleep_ms, sleep_us
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import framebuf
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background = framebuf.FrameBuffer(bytearray(
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b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\x80\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x7f\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\xa0\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd0\xff\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\xe8\xff\xfb\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x07\xe8\xff\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x08'
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b'\xe8\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\xe8\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10'
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b'\xe8\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\xe8\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10'
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b'\xe8\xff\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x08\xe8\xff\xfb\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x07'
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b'\xd0\xff\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa0\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\x40\x7f\x11\x42\x08\x21\x84\x10\x42\x08\x21\x84\x10\x42\x08\x01\x80\x80\x10\x42\x08\x21\x84\x10\x42\x08\x21\x84\x10\x42\x08\x01'
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b'\x00\x7f\x10\x42\x08\x21\x84\x10\x42\x08\x21\x84\x10\x42\x08\x01\x00\x00\x10\x40\x00\x01\x04\x10\x40\x00\x01\x04\x10\x40\x00\x01'
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b'\x00\x00\x10\x40\x00\x01\x04\x10\x40\x00\x01\x04\x10\x40\x00\x01\x00\x00\x10\x40\x00\x01\x04\x10\x40\x00\x01\x04\x10\x40\x00\x01'
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b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\x00\x00\x38\x00\xe0\x0e\x00\xea\x00\xe0\x0e\x00\xee\x00\x98\x3b\x00\x00\x28\x00\x80\x0a\x00\xaa\x00\x20\x0a\x00\xaa\x00\x90\x2a'
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b'\x00\x00\x28\x00\xe0\x0a\x00\xae\x00\xe0\x0a\x00\xae\x00\x90\x2a\x00\x00\x28\x00\x20\x0a\x00\xa8\x00\xa0\x0a\x00\xaa\x00\x90\x2a'
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b'\x00\x00\x38\x00\xe0\x0e\x00\xe8\x00\xe0\x0e\x00\xee\x00\xb8\x3b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'),
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128, 30, framebuf.MONO_HMSB)
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TWI = I2C(scl = 'PB9', sda = 'PB8', freq = 400000)
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oled = OLED(TWI)
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adc = ADC(Pin('A0'))
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def map_value(v, x_min, x_max, y_min, y_max):
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return (y_min + (((y_max - y_min) / (x_max - x_min)) * (v - x_min)))
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def get_adc_avg():
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samples = 64
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temp = 0
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while(samples > 0):
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temp += adc.read()
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sleep_us(100)
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samples -= 1
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temp >>= 6
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return temp
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oled.fill(oled.BLACK)
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oled.show()
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while(True):
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adc_value = get_adc_avg()
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t = map_value(adc_value, 810, 3200, 0, 100)
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if((t >= 0) and (t <= 100)):
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t_str = "T/deg C: " + str("%3.1f" %t)
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else:
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t_str = "T/deg C: ---"
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oled.fill(oled.BLACK)
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oled.text(t_str, 6, 4, oled.WHITE)
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oled.text("ADC: " + str("%4u" %adc_value), 6, 16, oled.WHITE)
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oled.blit(background, 0, 30)
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l = int(map_value(t, 0, 100, 0, 100))
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oled.fill_rect(20, 38, l, 4, oled.WHITE)
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oled.show()
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print(t_str)
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sleep_ms(400)
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‎MODBUS DS18B20 to 4-20mA Industrial Current Loop/V-I Transmitter (DAC)/MODBUS_DS18B20.py

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from micropython import const
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from utime import sleep_ms
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class MODBUS_DS18B20():
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def __init__(self, _uart):
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self.tx_data_frame = bytearray(8)
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self.rx_data_frame = bytearray(9)
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self.uart = _uart
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def generate_CRC16(self, value, length):
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n = 0
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s = 0
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crc_word = 0xFFFF
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for s in range (0x00, length):
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crc_word ^= value[s]
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for n in range (0x00, 0x08):
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if((crc_word & 0x0001) == 0):
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crc_word >>= 1
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else:
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crc_word >>= 1
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crc_word ^= 0xA001
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return crc_word
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def check_crc(self, value, s, e):
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hb = value[e]
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lb = value[s]
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crc = hb
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crc <<= 8
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crc |= lb
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return crc
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def MODBUS_RX(self):
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if(self.uart.any() > 0x00):
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self.rx_data_frame = self.uart.read(9)
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def MODBUS_TX(self):
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crc = 0
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self.tx_data_frame[0x00] = 0x01
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self.tx_data_frame[0x01] = 0x03
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self.tx_data_frame[0x02] = 0x00
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self.tx_data_frame[0x03] = 0x00
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self.tx_data_frame[0x04] = 0x00
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self.tx_data_frame[0x05] = 0x02
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crc = self.generate_CRC16(self.tx_data_frame, 6)
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self.tx_data_frame[0x06] = (crc & 0x00FF)
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self.tx_data_frame[0x07] = ((crc & 0xFF00) >> 0x08)
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self.uart.write(self.tx_data_frame)
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sleep_ms(100)
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def get_temp(self):
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crc_1 = 0x0000
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crc_2 = 0xFFFF
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temp = 1000
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self.MODBUS_TX()
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self.MODBUS_RX()
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if(self.rx_data_frame[0x00] == 0x01):
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if(self.rx_data_frame[0x01] == 0x03):
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crc_1 = self.generate_CRC16(self.rx_data_frame, 7)
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crc_2 = self.check_crc(self.rx_data_frame, 7, 8)
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if(crc_1 == crc_2):
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temp = self.rx_data_frame[3]
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temp <<= 0x08
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temp |= self.rx_data_frame[4]
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temp /= 10.0
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if((temp >= -30) and (temp <= 110)):
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return temp
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else:
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return -1000
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return 1000
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