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how to make an esp8266ex work
zenomagna

zenomagna

@copilot how to make an esp8266ex work
2y

copilot

Getting the ESP8266EX to work involves several key steps, including powering the device correctly, connecting it to peripherals, and programming it. Let's start with a basic connection setup to get it up and running:
Power Supply
Make sure the ESP8266EX is powered correctly:
  • Connect IC2:VDDA_1, IC2:VDD3P3_1, IC2:VDD3P3_2, IC2:VDD_RTC, IC2:VDDPST_1, and IC2:VDDPST_2 to 3.3V power supply.
  • Connect IC2:EP_(GND) to GND.
Basic Connections
To ensure the ESP8266EX can start properly and be programmed, connect the following pins:
  • Connect IC2:XTAL_IN to a 26 MHz crystal oscillator. The XTAL_OUT pin should be connected to the other pin of the crystal.
  • Connect IC2:CHIP_EN to 3.3V through a 10kΩ pull-up resistor.
  • Connect IC2:GPIO0 to GND through a 10kΩ pull-down resistor for boot mode selection during programming.
Serial Communication
For serial communication (for programming and debugging):
  • Connect IC2:U0TXD to the RX pin of your USB-to-serial module.
  • Connect IC2:U0RXD to the TX pin of your USB-to-serial module.
  • Connect IC2:EXT_RSTB to a push-button (optional), along with a 10kΩ pull-up resistor to 3.3V.
Program the ESP8266EX
Use an adapter or directly connect it to your PC using a USB-to-serial adapter. Install the necessary drivers and use the Arduino IDE or a similar platform to write and upload code to the ESP8266EX.
Example of Pin Connections
Here's a simple connection example to illustrate the connections.
  • 3.3V Power Supply
    • Connect IC2:VDDA_1, IC2:VDD3P3_1, IC2:VDD3P3_2, IC2:VDD_RTC, IC2:VDDPST_1, IC2:VDDPST_2 to 3.3V
    • Connect IC2:EP_(GND) to GND
  • Crystal Oscillator
    • Connect IC2:XTAL_IN to one pin of a 26 MHz crystal oscillator
    • Connect IC2:XTAL_OUT to the other pin of the crystal oscillator
  • Enable Pin and Boot Mode
    • Connect IC2:CHIP_EN to 3.3V through a 10kΩ pull-up resistor
    • Connect IC2:GPIO0 to GND through a 10kΩ pull-down resistor
  • Serial Communication
    • Connect IC2:U0TXD to RX of the USB-to-serial module
    • Connect IC2:U0RXD to TX of the USB-to-serial module
    • Connect IC2:EXT_RSTB to the push-button and to 3.3V through a 10kΩ pull-up resistor
Make sure to double-check your connections and specifications before proceeding. Let me know if you need further details on specific steps!
2y
zenomagna

zenomagna

what crystal
2y

copilot

For the ESP8266EX, a 26 MHz crystal oscillator is typically used to provide the clock signal. Here are some specifics about selecting and connecting the crystal:
Crystal Specifications:
  • Frequency: 26 MHz
  • Load Capacitance: Typically around 12-22 pF (check the datasheet for exact values)
  • Stability: ±10 ppm or better (frequency stability)
  • Operating Temperature: -20°C to +70°C or wider
Connection Example:
  • Connect IC2:XTAL_IN to one pin of the 26 MHz crystal.
  • Connect IC2:XTAL_OUT to the other pin of the crystal.
  • Load Capacitors (C1 and C2): Place capacitors between each crystal pin and GND. The values are typically chosen to match the load capacitance specified in the crystal's datasheet (often 12-22 pF).
Circuit Diagram 
Plaintext
       +------+
       |      |
  XTAL_IN ----+----/\/\/\/---- 26 MHz Crystal
       |      |
  GND  ----/\/\/\/
       |      |   
       +------+
Crystal Load Capacitors
Assume you selected a crystal with a load capacitance of 18 pF. Here is how to connect them:
  • Connect one end of C1 (18 pF capacitor) to IC2:XTAL_IN.
  • Connect the other end of C1 to GND.
  • Connect one end of C2 (18 pF capacitor) to IC2:XTAL_OUT.
  • Connect the other end of C2 to GND.
Final Connections:
  • Connect IC2:XTAL_IN to the crystal pin 1.
  • Connect IC2:XTAL_OUT to the crystal pin 2.
  • Connect one end of C1 to IC2:XTAL_IN and the other end to GND.
  • Connect one end of C2 to IC2:XTAL_OUT and the other end to GND.
Example Connection List:
  • Connect IC2:XTAL_IN to the first pin of the 26 MHz crystal.
  • Connect IC2:XTAL_OUT to the second pin of the 26 MHz crystal.
  • Connect first pin of the 26 MHz crystal to one end of C1; connect the other end of C1 to GND.
  • Connect second pin of the 26 MHz crystal to one end of C2; connect the other end of C2 to GND.
This completes the crystal oscillator setup for the ESP8266EX. Ensure all components are properly rated and connected to avoid stability issues.
2y
1
IC2
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