ESP8266 Wired up and semi-working

I’ve got the ESP8266 (ESP-03) wired up and semi-working. I’ve read in many blog posts that this package can take quite a bit of current to power so I’m assuming that’s why I can’t get it to connect to an AP. I ordered a 5v/3.3v breadboard power supply and once that arrives I’ll try testing again. Right now it’s connected to an Arduino UNO R3 using the software UART. Luckily I didn’t have to flash any newer firmware to achieve the lower baud rate needed.

In the image below you’ll see I just used the same wires that I made in an earlier post to solder onto the ESP8266. This allowed me to easily connect it to a breadboard for testing. Ideally for prototyping I’d like to get an adapter board like the one made byElectroDragon. The end result of any project would probably be to surface mount solder the ESP8266 to another PCB like the Baoshi designed breakout board.


New IoT Toy – ESP8266

I’m very excited to try out this new chip. This is the EspressifESP8266. A super cheap (approx. $3-4 CDN) and very small SOC with built in WiFi. It’s somewhat similar to the Spark Core that I already have, though not quite as refined and minus the cloud access. The ESP8266 was released early 2014 but didn’t really show up on my radar till about August 2014. I dismissed it initially as there was very little documentation out on the internet. But then I checked up on it again in December and I was amazed by the ever growing number of follower. New documentation was created, existing stuff had been translated (mostly) and there were plenty of project already in the works. I decided to buy three of these on eBay from user “czb6721960“.


  • 11 b/g/n
  • Wi-Fi Direct (P2P), soft-AP
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLLs, regulators and power management units
  • 11b mode + 19.5dBm output power
  • Built-in temperature sensor
  • Antenna diversity support
  • Power down leakage current of <10uA
  • Integrated low power 32-bit CPU (could be used as application processor)
  • SDIO 1.1/2.0, SPI, 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)

Here is a link to the best translated english datasheet provided by NURDspace.