Woh! Super low-cost WiFi module is here, we are carrying it now! The ESP-01S ESP8266 WiFi Module is a self-contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino device and get about as much WiFi-ability as a WiFi Shield offers (and that’s just out of the box)! The ESP8266 module is an extremely cost-effective board with a huge, and ever-growing, community. There are plenty of discussion and happening in the official community: http://www.esp8266.com
This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application-specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, including the front-end module, which is designed to occupy minimal PCB area. The ESP8266 supports APSD for VoIP applications and Bluetooth co-existence interfaces, it contains a self-calibrated RF allowing it to work under all operating conditions and requires no external RF parts.
There is an almost limitless fountain of information available for the ESP8266, all of which has been provided by amazing community support. Under the Resources section, you will find many resources to aid you in using the ESP8266, even instructions on how to transforming this module into an IoT (Internet of Things) solution!
This module is very low cost, but very simple. It doesn't support SSL, or communcation over SPI - just UART! It also doesn't have a regulator on board and it can use big spikes of 300mA or more current at 3.3V so if using with an Arduino, an external 3V regulator is essential! (Seriously don't try to power it from the 3.3V power pin the Arduino!) Also, the connector is kind of annoying and not breadboard-friendly, some female-to-male wires can help out in that case to make it easy to plug into a breadboard.
That said, it does do the job, and can be used as a UART-at-9600-baud to WIFI adapter using example code for Arduino or, for the really adventurous, programmed directly using an SDK
- Model: ESP-01S
- Power: 3.3VDC, proper 3.3V voltage regulator and NO level shifter is needed as the IO pins are 5V tolerant.
- 802.11 b/g/n protocol
- Wi-Fi Direct (P2P), soft-AP
- Integrated TCP/IP protocol stack
- Integrated TR switch, balun, LNA, power amplifier and matching network
- Integrated PLLs, regulators, DCXO and power management units
- +19.5dBm output power in 802.11b mode
- Integrated temperature sensor
- Support antenna diversity
- Power down leakage current of <10uA
- Integrated low power 32-bit CPU could be used as application processor
- Interfacee: SDIO 1.1 / 2.0, UART
- STBC, 1×1 MIMO, 2×1 MIMO
- A-MPDU & A-MSDU aggregation & 0.4ms guard interval
- Wake up and transmit packets in < 2ms
- Standby power consumption of < 1.0mW (DTIM3)
The picture above show the difference between ESP-01 and ESP-01S. ESP-01 is an old version. Now we have releases a new version that has some differences. Among them is ESP-01S have Stronger Antenna Signal but ESP-01 not have it. Both on black boards, one with red and blue leds (non "S") and one with only blue led ("S") is also, that the "s" version requires only vcc and gnd to boot from flash and run flashed program, while the "non s" version requires also 3.3v on CH_PD pin to boot correctly (run flashed program). ESP8266 also not breadboard-friendly is because it will short-circuit the pin connection when you directly connect those pins to breadboard.
- NURDspace Wiki (Schematic, Datasheet and More)
- ESP8266 Tutorial Part I – Getting Started
- ESP8266 Tutorial Part II - ESP8266 Hello Webserver with Arduino IDE
- ESP8266 Tutorial Part III – Customise Your Web Server with Arduino
Check the tutorial video:
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