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PicoWeb TM : A Full-Function Ethernet Web Server for Under $10

PicoWebTM is a low-cost and compact web server that combines cheap microcontrollers and NIC chips for affordable embedded internet solutions. This server is ideal for set-top boxes, cable/DSL modems, and other web-enabled devices.

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PicoWeb TM : A Full-Function Ethernet Web Server for Under $10

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  1. PicoWebTM: A Full-Function Ethernet Web Server for Under $10 Embedded Internet Conference September 5, 2000 San Jose, California Bruce D. Lightner Lightner Engineering La Jolla, California E-mail: lightner@lightner.net URL: www.picoweb.net Telephone: (858) 551-4011

  2. PicoWebTM Server

  3. PicoWebTM “Design Space” • Under $10 Web servers • Minimal RAM (required for cheap Cs) • “Stateless” TCP/IP stack • Marriage of low-cost Cs and low-cost NIC chips • Inexpensive NIC chip cost drivers: Set-top boxes, cable/DSL modems • Not a “terminal server” • Not a “university toy” WSWS* * World’s Smallest Web Server

  4. Realtek 10baseT ISA-Bus Card Crystal Magnetics 10baseT EEPROM PROM RealtekNIC Chip Price: $9 (Fry’s)

  5. PicoWebTM $25 Breadboard PC NE-2000 Ethernet Card ISA-Bus Connector LED Atmel P* +5V DC Reset Program Port Serial Port 16KB Serial EEPROM *Atmel AT90S8515

  6. PicoWebTM Server Minimum BOM 10baseT NIC (<$3) Microcontroller (<$5)

  7. PicoWebTM Server Features • Complete full-function stand-alone Web server • Based on Atmel 90S8515 8-bit microcontroller • Ethernet controller on-board (10baseT) • 100% Flash-based (code/data/HTML/images) • RFC-793 compliant TCP/IP stack • CGI support (PicoWeb p-code/AVR assembly) • Update p-code/Web pages via network • Complete development environment (Windows)

  8. PicoWebTM Block Diagram Atmel 90S85158-bit Controller Digital I/O 9-24 +5V DC Regulator VDC SPI Port RS-232 16KB Serial I2C EEPROM DB25 MaximRS-232 XCVR Realtek Ethernet Controller Ethernet 10baseT Interface LEDs Col Link User

  9. PicoWebTM Server PCB

  10. PicoWebTM Server Hardware • Atmel 90S8515 8-bit microcontroller (8 MHz) • Realtek NE-2000 Ethernet chip (10baseT) • 8 KB flash program memory (~2 KB free) • 512 bytes on-chip SRAM (~256 free) • 512 bytes on-chip data EEPROM (~500 free) • 16 KB I2C serial EEPROM chip (~16 KB free) • 16+ free I/O lines • RS-232 serial port (with RTS/CTS) • Onboard +5V DC regulator (~30 mA used) • In-circuit programming port (PC parallel port)

  11. PicoWebTM Sample Web Page

  12. PicoWebTM HTML/CGI Example Process FORM’sURL parameters <html> `pchk_port_url_parms.cgi` <head><title>WebLED</title></head> <body text=#000000 bgcolor=#c0c0c0> <center> <h2>Frey 'n Hell Light <font color="red">WebLED</font> v$$VERSION$$</h2> <form name=mfrm method=GET action="/"> <input type=radio NAME=4 VALUE=0 `?testport.cgi?0x04`CHECKED{}>on<br> <input type=radio NAME=4 VALUE=1 `?testport.cgi?0x04`{CHECKED}>off<br> <input type=submit VALUE="Set LED"> </form> &#169;1998-1999 Freyder, Helland & Lightner <br><br> <img src="steve.jpg" width=64 height=100 alt="Frey">&nbsp <img src="dave.jpg" width=64 height=100 alt="Hell">&nbsp <img src="bruce.jpg" width=64 height=100 alt="Light"> <br><br> The current temperature reading is `temperature.cgi`&#176;F </center></body></html> Turn LED on(I/O bit 4) Conditional:Is I/O bit 4 on? Read/emit temp.(as ASCII text)

  13. PicoWebTM WebTemp Page

  14. PicoWebTM Server Development • Atmel AVR assembly/PicoWeb p-code • Windows command-line based environment • GNU-based “open source” tools (avr-asm, gcc, ld, Perl, etc.) • User supplies HTML code, JPEG/GIF images • CGI support (user-supplied routines) • On-chip debug monitor (serial port/Web) • Fast turn-around (edit/build/load/run) • Program changes: <60 sec. • Web page/external p-code changes: <5 sec. • Restrictions? Yes! (relating to host -controller)

  15. PicoWebTM WebCam Mattel“Fun” Camera RS-232 PicoWeb Server(with Java Applet) 10baseT Internet

  16. PicoWebTM Sample WebCam Page

  17. PicoWebTM WebCam Java Applet Raw Image from “BarbieCam” Supply “Missing” Pixels Sharpen Image and Display

  18. PicoWebTM Enabled Instrument Probe Ultra-Sonic Thickness Gauge RS-232 PicoWeb Server 10baseT Internet

  19. PicoWebTM Enabled Instrument

  20. PicoWebTM Enabled Thermostat RCS TR-15 HVAC Thermostat PicoWebPCB HVAC Controller Wall Unit Ethernet

  21. PicoWebTM Enabled Thermostat

  22. PicoWeb Applications • Low-cost Web-enabled devices (TCP/IP) • Low-cost networked devices (non-TCP) • Web-enabled appliances/instruments • Home/business security/environmental monitoring/remote control • Web cameras (home/business) • Meter reading/control (utilities) • Routers, bridges, packet filters, “smart” switches • Streaming audio/video, teleconferencing • Low-cost, high-performance VPN’s • Wiring alternative to RS-232/485, USB, etc.

  23. PicoWeb Security Issues • Existing: • Clear-text passwords • “Trusted host” list(s) • Future: • Secure passwords (public-key/tokens/challenge-response) • Encrypted “payload” data (as with SSL) • Levels of security (appropriate use) • Cost (no one ever wants to pay for security!) • How much is good enough?* *Let’s not forget that we’re talking about a C!

  24. PicoWebTM www.picoweb.net Pricing? ??? Applications? Licensing? Orders?

  25. 16 Kbyte SRAM(programmer defined) Transmit Buffer(s) Receive Queue Col Link LEDs NE-2000 Ethernet NIC 4 10baseT Data 16 EthernetMACLogic PHY Address 5 6 ThinNet Misc. 15 n ISABus 20 MHzCrystal ~100 pins Config.EEPROM Quantity Price -------- ----- 100 $5.50 1,000 3.20 >10,000 ~3.00 Boot ROM (optional) (external)

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