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U2
connect this with multiplexer
harshap

harshap

@copilot connect this with multiplexer
2y

copilot

To connect the ATTiny85 (U1) microcontroller with the MC74HC4051ADR2G multiplexer (U2) effectively, you typically need to set up the multiplexer with control inputs that can be driven by the microcontroller to select one of the multiple channels available on the multiplexer. The setup will allow the microcontroller to select which channel of the multiplexer is currently connected to its common port.
Here's a basic connection setup based on typical usage:
  1. Power Connection:
    • Already made as per your project description, both devices share a common ground named GND.
  2. Multiplexer Control Signals: The ATTiny85 can use its GPIO pins to control the multiplexer's channel selection by connecting them to the multiplexer's select pins (A, B, C).
    • Connect U1:PB0 (AREF/PB0) to U2:X (Pin 3) - Assuming you want to use PB0 for analog or digital input/output through the multiplexer.
    • Connect U1:PB1 to U2:A (Pin 11) - This will be the least significant bit of the channel select.
    • Connect U1:PB2 to U2:B (Pin 10) - Middle bit of the channel select.
    • If you want to use all 8 channels, you'll need another GPIO from the ATTiny85 for the most significant bit. Assuming you'll use U1:PB3 (XTAL1/PB3) for this: Connect U1:PB3 to U2:C (Pin 9).
  3. Enable Signal:
    • To enable the multiplexer, you need to drive the U2:~EN~ pin low. If you have a spare pin, you can control this from the microcontroller, or you can tie it to GND permanently if you always want the multiplexer enabled.
    • Assuming you want to control it: Connect U1:PB4 (XTAL2/PB4) to U2:~EN~ (Pin 6). This allows the microcontroller to enable or disable the multiplexer as needed.
  4. Power Supply Connection: Ensure both U1 and U2 are connected to a suitable power supply. From your project description, it looks like you've already taken care of this since both have a GND connection and presumably a VCC connection.
    • Ensure U2:VCC (Pin 16) and U1:VCC (Pin 8) are connected to the positive supply rail.
    • Connect U2:VEE (Pin 7) to the most negative power supply voltage if needed. For single supply operations, this is typically connected to GND.
These connections allow you to digitally select which of U2's channels is connected through by writing combinations of high and low values to PB1, PB2, and optionally PB3, and use PB4 to enable/disable the multiplexer. Remember, this setup assumes you want to control the multiplexer directly with the GPIO pins; adjust pin connections based on your actual application requirements.
2y
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