how do i get it working on osx

Since I had a bit of trouble figuring this out as most of the info I found is for Windows, here are the steps to get this working with the Arduino IDE on a Mac: 1. Download the Mac VCP drivers at https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers 2. Install the drivers, and make sure you authorize any security prompts that appear while installing 3. (On recent macOS releases) Open System Preferences > Security & Privacy > General. You’ll see a message about the Silabs driver being blocked at the bottom. Click “Allow” 4. Download and install the Arduino IDE 5. Open Arduino Preferences and paste the URL below in Additional Board Manager URLs: http://arduino.esp8266.com/stable/package_esp8266com_index.json 6. Go to Tools > Board > Board Manager> Type “esp8266” and download the Community esp8266 and install 7. Set up your chip as: Tools > Board > NodeMCU 1.0 (ESP-12E Module) Tools > Flash Size > 4M (3M SPIFFS) Tools > CPU Frequency > 80 Mhz Tools > Upload Speed > 921600 Tools > Port > /dev/cu.SLAB_USBtoUART (leave the rest as-is) 8. Open File > Examples > ESP8266 > Blink 9. Compile and Upload. After it's done uploading, the red led should start blinking in your board.

How many output amps can this handle?

The AMS1117-3.3 chip (3.3v regulator) looks like it has a maximum load of 1.5A. So that minus whatever the ESP itself draws. To be on the safe side, I'd limit the current draw off the 3.3v supply to around 500mA.

Is there a built-in micro sd card? (description says it does, but the two units i received don't seem to have a slot for inserting an sd card).

I think you might be reading the description wrong. It does say "Built-in Micro-USB" and that is not the same as micro sd. I have not seen a description stating it supports a micro sd.

What firmware or program is already onboard? when i connect at 115200 baud it shows the nearby ssids, but i don't know how to send commands.

If you only see nearby SSIDs, it means that your board has the "WiFiScan.ino" load on the board. You can see the source here - https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266WiFi/examples/WiFiScan/WiFiScan.ino "AT" commands won't do you any good since it is not loaded. There are a couple of instruction you can read here - https://github.com/esp8266

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HiLetgo 2pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board (Wi-Fi, USB) - Arduino Compatible, 1MB RAM, 80MHz CPU, 1M Flash, 2 Boards

HiLetgo 2pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board (Wi-Fi, USB) - Arduino Compatible, 1MB RAM, 80MHz CPU, 1M Flash, 2 Boards

Product ID: 21881533

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Details

Brand
HiLetgo
Model Name
ESP-12E
Ram Memory Installed Size
1 MB
Memory Storage Capacity
1E+6 Bytes
CPU Speed
8E+1 MHz

⚡80MHz CPU speed

💾1MB Flash memory

📶Built-in Wi-Fi 802.11b

Description

🚀 Code Fast, Connect Faster: Your IoT Edge Starts Here!

ARDUINO IDE READY - Fully compatible with the latest Arduino IDE, making coding and prototyping effortless for pros and hobbyists alike.
COMPACT YET MIGHTY - Sleek 5 x 3.74 inch design packs 1MB flash and 80MHz CPU for high-speed, reliable performance.
DUAL BOARD ADVANTAGE - Get two development boards in one pack—double your innovation potential and collaborative projects.
PLUG PLAY WI FI POWERHOUSE - Seamlessly integrate IoT projects with built-in ESP8266 Wi-Fi module for instant connectivity.
FLASH RESET AT YOUR FINGERTIPS - Built-in micro-USB with flash and reset switches for quick programming and debugging—no extra tools needed.

The HiLetgo 2pcs ESP8266 NodeMCU CP2102 ESP-12E Development Boards are compact, Arduino-compatible Wi-Fi modules featuring an 80MHz CPU, 1MB flash memory, and built-in micro-USB ports with flash/reset switches. Perfect for rapid IoT prototyping and wireless projects, these boards offer seamless integration with Arduino IDE, Mongoose IoT, and Micropython, empowering developers to build connected solutions with ease.

Specifications

Processor	8E+1
RAM	DDR
Memory Speed	80 MHz
Wireless Type	802.11b
Brand	HiLetgo
Series	ESP-12E
Item model number	3-01-0268
Operating System	Arduino IDE, Mongoose IoT, Micropython
Item Weight	1.44 ounces
Product Dimensions	5 x 3.74 x 0.51 inches
Item Dimensions LxWxH	5 x 3.74 x 0.51 inches
Color	Pack of 2PCS
Processor Brand	Espressif
Number of Processors	1
Voltage	5 Volts
Manufacturer	HiLetgo
ASIN	B010N1SPRK
Is Discontinued By Manufacturer	No
Date First Available	June 25, 2015

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