Hardware Links¶

• Raspberry Pi
• CHiP
• ESP8266
  • ESP Open SDK - open source SDK for ESP8266
  • "NodeMCU - lua based firmware for MCU like ESP8266
    • This has links to esptool for flashing firmware to device
  • ESPlorer is a Java IDE for the ESP8266
  • Arduino core for ESP8266 - look under doc for libraries, etc.
  • ESP8266 Arduino forum
  • Loading Firmware
  • Getting Started
  • Getting Started pdf (different version)
  • AT Commands
    • Get MAC address
  • Wifi Serial Programmer that replaces the FTDI Basic Board because the latter has weak voltage regulation. Also consider using the ESP-12 (also called an NodeMCU when it includes the Lua code) instead, which is more forgiving with power.
  • Examples
    • One Way Chat, part 2 shows how to connect basic hardware (somewhat limited) and program to run as a web server using stock programs.
    • HTTP I/O is a library that gives direct access to GPIO pins. This is essentially what we'd want except it needs to be wrapped in a security layer of some kind.

AC Control¶

1. TRIACs: Low cost, high current handling capability.
2. Traditional relay: moving parts, relatively low cost, very high current
3. Solid State Relay: Higher cost, no moving parts. Advantage over TRIACs is that SSR can interrupt current at any point in the AC waveform. TRIACs only cut off current at the zero-crossing point.

DC Control¶

TBC

Stepper Motor Control¶

1. TI DRV8811: Integrated FETs, up to 1.9A per coil http://www.ti.com/lit/ds/symlink/drv8811.pdf
2. (Toshiba?) TB6612: Used on adafruit and other boards: https://www.adafruit.com/products/2448 Documentation/sourcing appears limited