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Will this configuration work to read the value of four potentiometers?
giulioz

giulioz

@copilot Will this configuration work to read the value of four potentiometers?
2y

copilot

The project description you provided does have four potentiometers. According to the provided information, they are connected to an ADS1115 analog-to-digital converter (ADC) which communicates with a Raspberry Pi Pico via an I2C interface. The ADS1115 has 4 analog input channels (AIN0 to AIN3), so it is capable of reading up to four analog signals simultaneously which makes it an excellent choice for connecting 4 potentiometers.
In order to get this configuration to work, the wipers (center pins) of the potentiometers should be connected to the respective AIN0 to AIN3 pins on the ADS1115. The other two pins of each potentiometer should be connected to a stable reference voltage (VCC) and ground.
Here's how each potentiometer is connected based on the project description:
  1. SMPL_A:2 is connected to U2:AIN1
  2. SMPL_B:2 is connected to U2:AIN2
  3. OCTAVE:2 is connected to U2:AIN3
  4. DEC/ATK:2 is connected to U2:AIN0
Keep in mind you'll also need to ensure the pull-up resistors are correctly placed for the I2C bus to function properly, and library support in software to interface with both the I2C bus and the ADS1115 ADC in particular.
When it comes to programming, the Raspberry Pi Pico will need to be configured as the master device on the I2C bus. It should initiate communications with the ADS1115, which acts as the slave device. After setting up the communication, the Pico can send commands to the ADS1115 to read the values of the potentiometers. These values, which represent the position of the potentiometer knob, can then be used in the Pico's program logic.
Source(s):
https://www.flux.ai/p/blog/raspberry-pi-pinouts-a-comprehensive-guide https://www.flux.ai/p/projects
2y
4
Will this circuit work for adding an audio output with PWM to a Raspberry PI Pic...
giulioz

giulioz

@copilot Will this circuit work for adding an audio output with PWM to a Raspberry PI Pico?
2y

copilot

Based on the provided schematic and components, it appears that you are trying to generate an audio output using the Raspberry Pi Pico's GPIO pin (specifically GPIO28_ADC2) through a buffer (the SN74LVC1G17QDCKRQ1). The audio signal then seems to be passed through a low-pass RC filter (R2, R3, C3, C4) before being output to a terminal (AUDIO_OUT_POS and AUDIO_OUT_NEG).
Yes, this setup should work for generating audio output with a PWM signal from the Raspberry Pi Pico. The key steps involved are:
  1. Generate a PWM signal on GPIO28_ADC2 pin of the Raspberry Pi Pico.
  2. This signal is then buffered through U3 (SN74LVC1G17QDCKRQ1). This IC is a single Schmitt-trigger buffer that helps in driving the PWM signal and providing a better impedance match.
  3. The output from the buffer goes through a low-pass filter formed by resistors (R2 and R3) and capacitors (C3 and C4). This filter will smooth out the PWM signal, providing an analog signal that can be interpreted by an audio device.
  4. The filtered signal is then output through the AUDIO_OUT_POS terminal, and the AUDIO_OUT_NEG terminal is connected to the ground.
Ensure that the PWM frequency is correctly set and that the low pass filter cutoff frequency is suitable for your audio range. The cutoff frequency of your filter is determined by the resistors and capacitors in the low-pass filter, and it should be set to a value that is within the audio frequency range (20 Hz - 20 kHz). The filter is used to remove the high-frequency components from the PWM signal, leaving only the desired audio signal.
Please note that the output voltage range of the PWM signal should match the acceptable input voltage range of your audio device. You might need to add a voltage divider or an amplifier depending on the requirements of your specific audio device.
2y
2
Will this circuit work for providing 3.3v to a Raspberry PI Pico from a 12v sour...
giulioz

giulioz

@copilot Will this circuit work for providing 3.3v to a Raspberry PI Pico from a 12v source?
2y

copilot

Based on the components present in your project, you are indeed attempting to regulate a 12V external input voltage down to a 3.3V level suitable for powering up the Raspberry Pi Pico. In your design, you are using the LP2985-33DBVR for this purpose.
The LP2985-33DBVR is a low-dropout, fixed-output voltage regulator that provides 3.3V and is capable of delivering an output current of 150mA. It's important to note that the maximum input voltage of this component is 16V, so a 12V input is within its acceptable range.
To accurately assess whether your design will function as expected, we need to consider a few additional points. Here are a few things to pay attention to:
  1. Current requirements: The Raspberry Pi Pico, depending on the configuration and usage, can draw up to 140mA of current. Considering the datasheet of the LP2985-33DBVR, it is capable of providing up to 150mA, which should be sufficient to power the Raspberry Pi Pico.
  2. Bypass Capacitors: You have included capacitors C6, C7, C1, and C5 in your design. These are typically used for proper regulation and noise reduction. Always ensure such capacitors are placed as close as possible to the V_in and V_out pins of your regulators.
  3. Component connections: It would be helpful to see how you've wired these components together to make sure there are no connection errors that might prevent the circuit from working.
Remember that your design should pass a thorough PCB design review, including essential steps such as schematic review, PCB layout review, and checking of manufacturing files, as mentioned in the attached project information.
But based purely on the properties of the LP2985-33DBVR and the average current draw of a Raspberry Pi Pico, your design should theoretically be able to power it with a 12V input. For a more accurate prediction, consider creating a circuit schematic and running simulations if possible.
Source(s):
https://docs.flux.ai/Introduction/walkthrough-3-parts https://docs.flux.ai/tutorials/pcb-design-review https://www.flux.ai/p/blog/raspberry-pi-pinouts-a-comprehensive-guide https://www.flux.ai/p/blog https://docs.flux.ai/Introduction/configure-your-mouse https://docs.flux.ai/introduction
2y
3
U1
MIDI_IN
SDA
SCL
RDY
R4
Resistance
10kΩ
R5
Resistance
10kΩ
R6
Resistance
10kΩ
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    16.1k
  • Generic Capacitor
    Generic Capacitor
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    jharwinbarrozo
    1.5M
  • Generic Resistor
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    jharwinbarrozo
    1.5M
  • Ground
    Ground
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    jharwinbarrozo
    20.5M
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • Net Portal
    Net Portal
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    jharwinbarrozo
    43.0M
  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
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    jharwinbarrozo
    1.1M
  • 1070TR
    1070TR
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    jharwinbarrozo
    700.5k

Pro-1 ModSample

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