Schematic Design Review

I

irflashrex

what kind of socket does that esp-01 fit in?

flux

The ESP-01/ESP-01S fits a 2×4 female socket header with:
  • 2.54 mm pin pitch
  • 2.54 mm row spacing—the two rows are adjacent
  • 8 contacts total
  • Through-hole, straight/vertical mounting
Use two 1×4, 2.54 mm female socket strips side-by-side or a purpose-made 2×4 ESP-01 socket. A standard wide 2×4 DIP socket/header with 7.62 mm row spacing will not fit.
I

irflashrex

can you find a part number?

flux

I’ll find a purchasable 2×4 female socket with 2.54 mm pitch in both directions and verify its dimensions against the ESP-01 header pattern.

flux

Use Samtec SSQ-104-01-G-D.
It is a:
  • 2×4 female PCB socket
  • Eight contacts
  • 2.54 mm contact pitch
  • 2.54 mm row spacing
  • Straight, through-hole mounting
  • Gold-plated contacts
It matches the ESP-01/ESP-01S pin pattern. A lower-cost tin-plated alternative is Samtec SLW-104-01-T-D.

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list all ESP-01 pins in a table format. For each pin provide its pin number, pin...
I

irflashrex

@copilot list all ESP-01 pins in a table format. For each pin provide its pin number, pin name and function.
2y

copilot

Here's a table listing the pins for the ESP-01 module, along with their pin numbers, names, and functions:

Table

Pin NumberPin NameFunction
1GNDGround
2IO2GPIO2, U1_TXD, I2C_SDA, 12SO_WS
3IO0GPIO0, HSPI_MISO, I2SI_DATA
4RXDGPIO3, I2SO_DATA
5TXDGPIO1
6ENChip Enabled Pin, Active High
7RSTReset Pin, Active Low
8VCCSupply Voltage
Would you like more details on any specific functionalities or application tips for these pins?
2y
I

irflashrex

do i need pin 2 to be high in normal operation?
2y

copilot

In normal operation, you typically want GPIO2 (Pin 2) on the ESP-01 module to be pulled high. This is generally important for successful booting when the ESP8266 is powered on or reset. Here are some details:
  • GPIO2: It should be connected to VCC (pulled high) for the ESP-01 to boot properly into the normal operating mode, also known as Flash mode.
Doing this ensures that the device doesn't enter a different boot mode, which could interfere with normal operations.
2y
I

irflashrex

do i need pin 3 to be high in normal operation?
2y

copilot

Yes, for normal operation of the ESP-01, you should also ensure that GPIO0 (Pin 3) is pulled high. Here’s why:
  • GPIO0: If GPIO0 is pulled high during power-up or reset, the ESP8266 boots into standard Flash mode, allowing the device to execute the firmware stored in its flash memory.
To enter the programming mode (to upload firmware), GPIO0 needs to be pulled low during reset. However, for regular operation, keeping it high ensures that the device boots correctly into normal operational mode.
2y
I

irflashrex

is there any resistance needed for pins 2 or 3?
2y

copilot

It's a good practice to use pull-up resistors to ensure that GPIO2 and GPIO0 are held high. A standard value for pull-up resistors in this context is typically around 10 kΩ. Here’s a bit more detail:
  • GPIO2 and GPIO0: Connect a 10 kΩ resistor between each GPIO pin and the VCC. This pull-up resistor helps maintain the pin in a high state and prevents it from floating, which might lead to unpredictable behavior.
These pull-up resistors are especially useful during power-up and reset to ensure reliable operation. Feel free to adjust the resistor values based on your specific design requirements, such as power consumption or signal integrity.
2y
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2
U2
VS1
Capacitance
100nF
C1
Capacitance
100nF
C5
Capacitance
100nF
C2
Capacitance
100nF
VS2
Capacitance
100nF

[Example] ESP32 Reference Design