Beschrijving
There are several solutions if you want to integrate wifi in your Arduino project. An ESP-14 is a complete µcontroller (STM8S003) and a wifi transceiver (ESP8266) in one module. The purpose of this combination is to provide more I/O pins than a regular ESP8266 based board such as ESP-12x, acting as an I/O extender. Unfortunately it needs some rather difficult soldering to make the connections to an Arduino. The ESP modules are 3.3Vdc, so in combination with an Arduino, a level-shifter and an adapted power supply are needed. It looks like an ESP8266xx can be best used stand-alone for IoT applications.
It should be possible to send ATcommands from an Arduino through a serial connection to the ESP-14. M_PD5 (blue=RX) must be connected to Arduino TX(18) and M_PD6 (yellow=TX) must be connected to Arduino RX(19).
According to Benjamin de Jong this module should respond to AT commands. More Gregware info on ESP14. Software example(ESP14-2) for 2560. Another software example and yet another software example(ESP14-1).
Dunno why, but I cannot get it up and running. Seems like I might have destroyed it while trying.
| Pin |
Name |
Connects |
Levelshift |
Arduino |
| 1 |
M_PC5 |
STM8 PC5 port |
|
- |
| 2 |
M_PC6 |
STM8 PC6 port |
|
- |
| 3 |
M_PC7 |
STM8 PC7 mouth |
|
- |
| 4 |
M_SWIM |
GND? |
|
GND |
| 5 |
M_PD3 |
STM8 PD3 port |
|
- |
| 6 |
M_PD4 |
STM8 PD4 port |
|
- |
| 7 |
M_NRST |
STM8 Reset |
3 <= 5 |
DIO out (2) |
| 8 |
GND |
GND |
|
GND |
| 9 |
M_PD2 |
STM8 PD2 port |
|
- |
| 10 |
M_PD5 |
STM8 PD5 TX port |
3 => 5 |
RX (18=blue) |
| 11 |
M_PD6 |
STM8 PD6 RX port |
3 <= 5 |
TX (19=yellow) |
| 12 |
M_PA1 |
STM8 PA1 port or crystal input port |
|
- |
| 13 |
M_PA2 |
STM8 PA2 output port or oscillator |
|
- |
| 14 |
ESP_GPIO0 |
ESP8266 GPIO0 port |
3 <= 5 |
DIO out |
| 15 |
M_VCAP |
STM8 VCAP port |
|
1uFCapacitor 470min 3300max nF to GND |
| 16 |
M_VDD |
STM8 power supply pin |
Buck |
3.3Vdc (2.95-5.5) |
| 17 |
ESP_VDD |
ESP8266 power supply pin |
Buck |
3.3Vdc |
| 18 |
M_PA3 |
STM8 PA3 port |
|
- |
| 19 |
M_PD5 |
STM8 PB5 port |
|
- |
| 20 |
M_PD4 |
STM8 PB4 port |
|
- |
| 21 |
M_PC3 |
STM8 PC3 port |
|
- |
| 22 |
M_PC4 |
STM8 PC4 port |
|
- |
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