ESP-03 is the smallest ESP8266 board that have on board antenna, it can fit for many projects that have limited space, such as wearable or portable device.
This instructables show how to build a testing board for early testing the ESP-03 board before actual soldering.
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Step 1: Why Need Testing Board?
- ESP-03 board is small, it is hard for soldering especially re-soldering if you want change pin connection while development
- The pin interval is 2.0 mm, it is hard to match the 2.54 mm width bread board
Step 2: Preparation
- a multipurpose PC board
- 2 x 7 pins male header
- 2 x 7 pins female header
- 3 x 10 k Ohm resistor
- 2 x button
Step 3: Bend and Solder the Header
- bend both the 7 pins male header and adjust the interval width to around 2.0 mm
- solder the bent header to the multipurpose PC board
- stick a sponge tape in the middle for insulate between ESP board and PC board
- cut the PC board extra part
Step 4: Fit the ESP-03 Board
Put the ESP-03 board on the PC board, check and adjust each header to make all can touch the ESP pin.
Step 5: Short the Reset Jumper
ESP-03 has a little jumper near Vcc pin, this is the jumper for connecting GPIO16 pin and reset pin. To facilitate the reset function for the testing board, it is required to short this jumper. Simply solder this jumper can make it.
Step 6: Solder the Female Header
Put the female header beside the male header and solder the pin connect one by one.
Step 7: Solder Other Parts
Vcc -> 10 K Ohm resistor -> EN pin
Vcc -> 10 K Ohm resistor -> GPIO16 pin (wrongly printed as GPIO18)
GND -> 10 K Ohm resistor -> GPIO15 pin
GND -> reset button -> GPIO16 pin
GND -> program button -> GPIO0 pin
Step 8: Happy Testing!
connect USB to TTL cable to ESP board
TTL Tx -> ESP Rx pin
TTL Rx -> ESP Tx pin
TTL 3.3 V -> ESP Vcc pin
TTL GND -> ESP GND pin
- hold program button
- press reset button
- release program button
- press reset button