Low Cost PWM to DAC Module

1, Low Cost , easy to reach high resolutions DAC (depended on the PWM resolutions)

2, The Accuracy only depended on the REF voltage accuracy

3, Add Precision digital to analog convertor in any low cost system with PWM signal

4, The output Full scale voltage is depended on the VREF

5, The PWM digital noise will not impact the analog output signal

 

Specifications

Signal Outputs

   Analog Outputs

Number of Channels :     3

Full Scale Range :         0 to VREF

Resolutions :            Depended on the PWM resolutions

Supply Voltage:          3 to 5.5V

VREF Voltage:            3 to 5.5V (Do not higher than VCC)

Support PWM Frequency:  100Hz to 10KHz

Output Minimum Voltage:  6mV

Output Max Voltage:      VCC – 100mV

Output Current:          30mA

Features

 

    ATMega328p core module
    Onboard 3.3V LDO
    Standard USB2Serial interface for uploading and debugging
    Onboard 2.4GHz RF Module
        RF-UNO-CORE : 0dB RF Module , 20m outdoor distance
        RF-UNO-CORE-PA: 20dBm RF Module , 200m outdoor distance
    Remote upload sketch via the native Arduino IDE
    100% Arduino development environment
    Vertical double row connector, minimum size on the main board

 

Parameters

 

    MCU: ATMega328p 32K Flash 2K SRAM 10bit ADC
    RF: LC-2000-P2P or LC-2000PA-P2P
    RF Max Baudrate: 256000bps
    Working Voltage : 3.3V with onboard LDO
    Input Voltage: DC 4.5 to 12V
    3.3V Output Current : 300mA MAX
    PCBA Size: 20 x 35mm
    Bootloader preprogramming : Arduino UNO R3

 

Notes

 

1, In the application, here have two way to provide power to RF-UNO-CORE(PA):

 

    (1), Connected 4.5 to 12V to JP3-Pin25 (VCC_IN) , the onboard LDO will regulate the power to 3.3V , and can be provide max 300mA via JP3-Pin26 (VCC_3V3) to periphery device, Please if the LDO become heat , user have to reduce the 3.3V periphery load , otherwise it may damaged the module.
    (2), Connected a 3.3V to JP3-Pin26 (VCC_3V3) , and left JP3-Pin25 (VCC_IN) folating.

 

2, In the application, here have two way to upload sketch to RF-UNO-CORE(PA):

 

    (1), Connected a USB to UART (UC-2102) to JP1, and upload sketch via Arduino IDE.
    (2), Connected a LC-2000(PA)-P2P Master to PC , and upload sketch by remote.
    (3), Since the JP1 and LC-2000(PA)-P2P module are share the TXD and RXD pin.

 

    Since the JP1 and LC-2000(PA)-P2P share the MCU UART pin (D0/D1) and the upload sketch need to using the UART , so here is some limit for upload sketch:

 

    1, During remote uploading operation, the JP1 can not connected to the USB to Serial cable, otherwise the download maybe failed.

    2, During the RF is connected (the LED on the RF Module is OFF) , it can not upload sketch via JP1, if you need to upload sketch via JP1, please disconnected RF connection (turn off the Master side of LC-2000), and then upload sketch via JP1 , after uploaded sketch, then repowered the Master side of LC-2000 , they will link again automatic.

 

About Digital IO

 

    The LC-2000(PA)-P2P are connected to MCU via below IOs:
        MCU D0 RXD <-> TXD LC-2000_Pin2
        MCU D1 TXD <-> RXD LC-2000_Pin3
        MCU D2    <-> RF_PAIR/CFG LC-2000_Pin5
        MCU D3    <-> RF_BUSY LC-2000_Pin6
    In the application , the D2/D3 only can used for LC-2000, user can be operation PAIR/CFG function by D2 and read D3 status to get RF BUSY status. The Arduino reference code as below:
        
#define RF_PAIR  2
#define RF_BUSY  3

void setup() {
  // put your setup code here, to run once:
  pinMode( RF_PAIR, OUTPUT );
  digitalWrite( RF_PAIR, HIGH );
  pinMode( RF_BUSY, INPUT );

  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println( "Hello Arduino!" );
  delay(100);
}

Step by Step for remote upload sketch

Components list:

    (1)RF-UNO-CORE * 1
    (2)LC-2000-P2P Master * 1
    (3)CB-LC-2000 * 1
    (4)5V Power for RF-UNO-CORE

 

Step1:  Connection LC-2000-P2P Master to the PC, power 5V to RF-UNO-CORE

 

    Make sure the RF-UNO-CORE and LC-2000-P2P Master is paired, after powered the LC-2000 LED should be off, if not paired the LED will be light.

    The CB-LC-2000 have two buttons , one is DTR and one is PAIR , press DTR pin to reset RF-UNO-CORE , after press the DTR pin , you should see the SCK LED on RF-UNO-CORE should be fast blink that means the board just reset.

    If the RF-UNO-CORE and LC-2000-P2P Master did not paired , long press the PAIR button on both side and the LED on the mould will be blink until paired.

 

Step2:  Open Arduino IDE , select Board: Arduino/Genuino Uno , and the port number for UC-2102.

Step3:  Write code, press “Upload” button.

Step4:  Done Uploading.

 

Application Schematic

 

    This schematic is demonstrated how to using UNO Core create 3-ch analog voltage , here we need a PWM to DAC module DAC-3000 , UNO Core use AnalogWrite function to create 3 ch PWM signal and DAC-3000 will converter the PWM to analog output , the output is: Vout = (1-PWM%) * Vref . in here the DAC output range is 0 to 3.3V.
    The Pin24 (VCC_3V3) connected onboard LDO’s output, it will share 3.3V with the module circuit , so the VCC_3V3 Load current have to limited within 300mA , otherwise it will lead the 3.3V unstable , or damaged the module.
    The UNO Core have a onboard RF module design(LC-2000) , the LC-2000 is a 2.4GHz RF UART module , it can be make UNO Core communication via 2.4GHz RF connection, but not all version will be install this module, Please notice the description, we have module number as below:
    UNO Core    :  without RF Module
    RF UNO Core  :  with RF Module

 

Upload sketch and communication

 

    RF UNO Core can be uploading sketch and communication via 2.4GHz RF connection , user need a USB Dongle on PC side and we call it LC-2000U , we will release this product in Jan.2016.
    Both RF UNO Core and UNO Core have a onboard UART connector , it’s a 6-Pin 2.0mm Female connector, user can be use stand USB2Serial Light cable to upload and communication with a 2.5mm to 2.0mm convertor. We also provide UC-2102 kit for this usage.

Features

 

    ATMega328p core module
    Onboard 3.3V LDO
    Standard USB2Serial interface for uploading and debugging
    Onboard 2.4GHz RF Module
        RF-UNO-CORE : 0dB RF Module , 20m outdoor distance
        RF-UNO-CORE-PA: 20dBm RF Module , 200m outdoor distance
    Remote upload sketch via the native Arduino IDE
    100% Arduino development environment
    Vertical double row connector, minimum size on the main board

 

Parameters

 

    MCU: ATMega328p 32K Flash 2K SRAM 10bit ADC
    RF: LC-2000-P2P or LC-2000PA-P2P
    RF Max Baudrate: 256000bps
    Working Voltage : 3.3V with onboard LDO
    Input Voltage: DC 4.5 to 12V
    3.3V Output Current : 300mA MAX
    PCBA Size: 20 x 35mm
    Bootloader preprogramming : Arduino UNO R3

 

Notes

 

1, In the application, here have two way to provide power to RF-UNO-CORE(PA):

 

    (1), Connected 4.5 to 12V to JP3-Pin25 (VCC_IN) , the onboard LDO will regulate the power to 3.3V , and can be provide max 300mA via JP3-Pin26 (VCC_3V3) to periphery device, Please if the LDO become heat , user have to reduce the 3.3V periphery load , otherwise it may damaged the module.
    (2), Connected a 3.3V to JP3-Pin26 (VCC_3V3) , and left JP3-Pin25 (VCC_IN) folating.

 

2, In the application, here have two way to upload sketch to RF-UNO-CORE(PA):

 

    (1), Connected a USB to UART (UC-2102) to JP1, and upload sketch via Arduino IDE.
    (2), Connected a LC-2000(PA)-P2P Master to PC , and upload sketch by remote.
    (3), Since the JP1 and LC-2000(PA)-P2P module are share the TXD and RXD pin.

 

    Since the JP1 and LC-2000(PA)-P2P share the MCU UART pin (D0/D1) and the upload sketch need to using the UART , so here is some limit for upload sketch:

 

    1, During remote uploading operation, the JP1 can not connected to the USB to Serial cable, otherwise the download maybe failed.

    2, During the RF is connected (the LED on the RF Module is OFF) , it can not upload sketch via JP1, if you need to upload sketch via JP1, please disconnected RF connection (turn off the Master side of LC-2000), and then upload sketch via JP1 , after uploaded sketch, then repowered the Master side of LC-2000 , they will link again automatic.

 

About Digital IO

 

    The LC-2000(PA)-P2P are connected to MCU via below IOs:
        MCU D0 RXD <-> TXD LC-2000_Pin2
        MCU D1 TXD <-> RXD LC-2000_Pin3
        MCU D2    <-> RF_PAIR/CFG LC-2000_Pin5
        MCU D3    <-> RF_BUSY LC-2000_Pin6
    In the application , the D2/D3 only can used for LC-2000, user can be operation PAIR/CFG function by D2 and read D3 status to get RF BUSY status. The Arduino reference code as below:
        
#define RF_PAIR  2
#define RF_BUSY  3

void setup() {
  // put your setup code here, to run once:
  pinMode( RF_PAIR, OUTPUT );
  digitalWrite( RF_PAIR, HIGH );
  pinMode( RF_BUSY, INPUT );

  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println( "Hello Arduino!" );
  delay(100);
}

Step by Step for remote upload sketch

Components list:

    (1)RF-UNO-CORE * 1
    (2)LC-2000-P2P Master * 1
    (3)CB-LC-2000 * 1
    (4)5V Power for RF-UNO-CORE

 

Step1:  Connection LC-2000-P2P Master to the PC, power 5V to RF-UNO-CORE

 

    Make sure the RF-UNO-CORE and LC-2000-P2P Master is paired, after powered the LC-2000 LED should be off, if not paired the LED will be light.

    The CB-LC-2000 have two buttons , one is DTR and one is PAIR , press DTR pin to reset RF-UNO-CORE , after press the DTR pin , you should see the SCK LED on RF-UNO-CORE should be fast blink that means the board just reset.

    If the RF-UNO-CORE and LC-2000-P2P Master did not paired , long press the PAIR button on both side and the LED on the mould will be blink until paired.

 

Step2:  Open Arduino IDE , select Board: Arduino/Genuino Uno , and the port number for UC-2102.

Step3:  Write code, press “Upload” button.

Step4:  Done Uploading.

 

Application Schematic

 

    This schematic is demonstrated how to using UNO Core create 3-ch analog voltage , here we need a PWM to DAC module DAC-3000 , UNO Core use AnalogWrite function to create 3 ch PWM signal and DAC-3000 will converter the PWM to analog output , the output is: Vout = (1-PWM%) * Vref . in here the DAC output range is 0 to 3.3V.
    The Pin24 (VCC_3V3) connected onboard LDO’s output, it will share 3.3V with the module circuit , so the VCC_3V3 Load current have to limited within 300mA , otherwise it will lead the 3.3V unstable , or damaged the module.
    The UNO Core have a onboard RF module design(LC-2000) , the LC-2000 is a 2.4GHz RF UART module , it can be make UNO Core communication via 2.4GHz RF connection, but not all version will be install this module, Please notice the description, we have module number as below:
    UNO Core    :  without RF Module
    RF UNO Core  :  with RF Module

 

Upload sketch and communication

 

    RF UNO Core can be uploading sketch and communication via 2.4GHz RF connection , user need a USB Dongle on PC side and we call it LC-2000U , we will release this product in Jan.2016.
    Both RF UNO Core and UNO Core have a onboard UART connector , it’s a 6-Pin 2.0mm Female connector, user can be use stand USB2Serial Light cable to upload and communication with a 2.5mm to 2.0mm convertor. We also provide UC-2102 kit for this usage.

 

Package List

 

    1 x RF-UNO-Core-PA Slave

MassDuino UNO Core

 

    Lower Price

    Arduino IDE Support

    Highly compatible to UNO R3

    32KB Flash 2KB RAM

    10/12/16Bit ADC 

/*======================================================

          analogRead()           // 10bit ADC, Compatible to UNO R3

          analogRead_12bits() // 12bit ADC , 130 sps

          analogRead_16bits() // 16bit ADC , 125 sps

======================================================*/

 

    Chip level support (MD-328D IC Lower to 0.6USD for mass purchase,click to view)

    Easy for prototype development , directly use for mass production!

 

 

Overview

 

    MassDuino UNO Core with UC-340G kit = $4.49(Click to View)

 

    10pcs MassDuino UNO Core with UC-340G kit = $19.99(Click to View)== USD 1.99/pcs

 

    100pcs MassDuino UNO Core with UC-340G kit = $129.99(Click to View)== USD 1.29/pcs

 

Features

 

    MD-328D core module
    Standard USB2Serial interface for uploading and debugging
    Onboard 2.4GHz RF Module (Optional)
    100% Arduino development environment
    Vertical double row connector, minimum size on the main board
    Full UNO IO supported

 

Parameters

 

    MCU: MD-328D 32K Flash 2K SRAM 10bit ADC
    Working Voltage : 3.3V with onboard LDO
    Input Voltage: DC 4.5 to 12V
    3.3V Output Current : 300mA MAX
    PCBA Size: 20 x 35mm
    Bootloader preprogramming : Arduino UNO R3

 

Application Schematic

 

    This schematic is demonstrated how to using UNO Core create 3-ch analog voltage , here we need a PWM to DAC module DAC-3000 , UNO Core use AnalogWrite function to create 3 ch PWM signal and DAC-3000 will converter the PWM to analog output , the output is: Vout = (1-PWM%) * Vref . in here the DAC output range is 0 to 3.3V.
    The Pin24 (VCC_3V3) connected onboard LDO’s output, it will share 3.3V with the module circuit , so the VCC_3V3 Load current have to limited within 300mA , otherwise it will lead the 3.3V unstable , or damaged the module.
    The UNO Core have a onboard RF module design(LC-2000,Clik to View) , the LC-2000 is a 2.4GHz RF UART module , it can be make UNO Core communication via 2.4GHz RF connection, but not all version will be install this module, Please notice the description, we have module number as below:
    UNO Core    :  without RF Module
    RF UNO Core  :  with RF Module(Click to View)

 

Upload sketch and communication

 

    RF UNO Core can be uploading sketch and communication via 2.4GHz RF connection , user need a USB Dongle on PC side and we call it LC-2000U , we will release this product in Jan.2016.
    Both RF UNO Core and UNO Core have a onboard UART connector , it’s a 6-Pin 2.0mm Female connector, user can be use stand USB2Serial Light cable to upload and communication with a 2.5mm to 2.0mm convertor. We also provide UC-2102 kit for this usage.