Simple test¶
Ensure your device works with this simple test.
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4import board
5import adafruit_mcp4728
6
7MCP4728_DEFAULT_ADDRESS = 0x60
8MCP4728A4_DEFAULT_ADDRESS = 0x64
9
10i2c = board.I2C() # uses board.SCL and board.SDA
11# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
12# use for MCP4728 variant
13mcp4728 = adafruit_mcp4728.MCP4728(i2c, adafruit_mcp4728.MCP4728_DEFAULT_ADDRESS)
14# use for MCP4728A4 variant
15# mcp4728 = adafruit_mcp4728.MCP4728(i2c, adafruit_mcp4728.MCP4728A4_DEFAULT_ADDRESS)
16
17mcp4728.channel_a.value = 65535 # Voltage = VDD
18mcp4728.channel_b.value = int(65535 / 2) # VDD/2
19mcp4728.channel_c.value = int(65535 / 4) # VDD/4
20mcp4728.channel_d.value = 0 # 0V
Vref Example¶
Example showing the way to work with Vref
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4from time import sleep
5import board
6import adafruit_mcp4728
7
8i2c = board.I2C() # uses board.SCL and board.SDA
9# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
10mcp4728 = adafruit_mcp4728.MCP4728(i2c)
11
12FULL_VREF_RAW_VALUE = 4095
13
14# pylint: disable=no-member
15mcp4728.channel_a.raw_value = int(FULL_VREF_RAW_VALUE / 2) # VDD/2
16mcp4728.channel_a.vref = (
17 adafruit_mcp4728.Vref.VDD
18) # sets the channel to scale between 0v and VDD
19
20mcp4728.channel_b.raw_value = int(FULL_VREF_RAW_VALUE / 2) # VDD/2
21mcp4728.channel_b.vref = adafruit_mcp4728.Vref.INTERNAL
22mcp4728.channel_b.gain = 1
23
24mcp4728.channel_c.raw_value = int(FULL_VREF_RAW_VALUE / 2) # VDD/2
25mcp4728.channel_c.vref = adafruit_mcp4728.Vref.INTERNAL
26mcp4728.channel_c.gain = 2
27
28mcp4728.save_settings()
29
30while True:
31 sleep(1)
General Call Example¶
Example showing the way to work with General Calls
1# SPDX-FileCopyrightText: 2021 codenio (Aananth K)
2# SPDX-License-Identifier: MIT
3
4import board
5import adafruit_mcp4728
6
7i2c = board.I2C() # uses board.SCL and board.SDA
8# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
9mcp4728 = adafruit_mcp4728.MCP4728(i2c)
10
11mcp4728.channel_a.value = 65535 # Voltage = VDD
12mcp4728.channel_b.value = int(65535 / 2) # VDD/2
13mcp4728.channel_c.value = int(65535 / 4) # VDD/4
14mcp4728.channel_d.value = 0 # 0V
15
16mcp4728.save_settings() # save current voltages into EEPROM
17
18print("Settings Saved into EEPROM")
19
20input("Press Enter to modify the channel outputs...")
21
22mcp4728.channel_a.value = 0 # Modify output
23mcp4728.channel_b.value = 0 # Modify output
24mcp4728.channel_c.value = 0 # Modify output
25mcp4728.channel_d.value = 65535 # Modify output
26
27print("Channel Outputs Modified")
28
29input("Press Enter to invoke General Call Reset ...")
30
31mcp4728.reset() # reset MCP4728