electronics-adc--mcp3204-ref

#!/usr/bin/env -S display_file_shell -l bash

                  MCP3208 (SOIC-16)
                   +-------+
              CH0 -| 1  16 |-- VDD
              CH1 -| 2  15 |-- VREF
              CH2 -| 3  14 |-- AGND
              CH3 -| 4  13 |-- CLK
              CH4 -| 5  12 |-- DOUT
              CH5 -| 6  11 |-- DIN
              CH6 -| 7  10 |-- CS/SHDN 
              CH7 -| 8   9 |-- DGND
                   +-------+

 ESP32 (3.3V) Connections:

 * VDD (MCP3208 pin 16):     Connect to ESP32 3.3V
 * VREF (MCP3208 pin 15):    Connect to ESP32 3.3V
 * AGND (MCP3208 pin 14):    Connect to ESP32 GND
 * DGND (MCP3208 pin 9):     Connect to ESP32 GND
 * CLK (MCP3208 pin 13):     Connect to ESP32 GPIO27
 * DOUT (MCP3208 pin 12):    Connect to ESP32 GPIO33
 * DIN (MCP3208 pin 11):     Connect to ESP32 GPIO32
 * CS/SHDN (MCP3208 pin 10): Connect to ESP32 GPIO25

Important Notes:
    Power Supply: The MCP3204 operates from 2.7V to 5.5V. The ESP32's 3.3V supply is within this range.
    Reference Voltage: Connect VREF to the same voltage as VDD for a full-scale analog input range of 0V to VDD.
    SPI Communication:
        The ESP32 will be the SPI master and the MCP3204 the slave.
        You'll need to configure the ESP32's SPI peripheral for the correct mode (Mode 0,0 or Mode 1,1).
        Refer to the MCP3204 datasheet and the ESP32 documentation for SPI configuration details.
    Chip Select (CS/SHDN): This pin must be pulled high between conversions to put the MCP3204 into low-power standby mode.
    Level Shifting: If your analog sensors output a voltage higher than 3.3V, you may need to use voltage dividers to scale the signals down to the acceptable range for the MCP3204.

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