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Measuring lots of analog signals takes up resources and pins, however, you can easily add more channels and separate processing with an external ADC.
  1. ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier ADA1083 Adafruit Australia

    ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier

    SKU: ADA1083
    For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1015 provides 12-bit precision at 3300 samples/second .. read more Learn More
    $16.95 AUD, inc GST
    AUD, inc GST
    delivered by
    Tue 30th of May

    $16.95 AUD

  2. ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier ADA1085 Adafruit Australia

    ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier

    SKU: ADA1085
    For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1115 provides 16-bit precision at 860 samples/second .. read more Learn More
    $25.00 AUD, inc GST
    AUD, inc GST
    delivered by
    Mon 5th of Jun

    $25.00 AUD

  3. Analog to Digital Converter - MCP3002 COM-08636 Sparkfun Australia

    Analog to Digital Converter - MCP3002

    SKU: COM-08636
    The MCP3002 has a 10-bit analog to digital converter (ADC) with a simple to use SPI interface. Use this IC if your microcontroller does not have an ADC or have enough ADC lines. A great chip when you need to add additional ADC lines. Learn More
    $4.14 AUD, inc GST
    AUD, inc GST
    delivered by
    Mon 5th of Jun

    $4.14 AUD

  4. MCP3424 18-Bit ADC-4 Channel with Programmable Gain Amplifier DFR0316 DFRobot Australia

    MCP3424 18-Bit ADC-4 Channel with Programmable Gain Amplifier

    SKU: DFR0316
    The module integrates MCP3432 A/D converter chip. The module can provide analog input function for Raspberry Pi and provide high accuracy analog input for Arduino. Learn More
    $21.07 AUD, inc GST
    AUD, inc GST
    delivered by
    Mon 5th of Jun

    $21.07 AUD

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