wifi sensor board

BOM

parts total: $6.23

Todo

• Fix pad positions in ESP part layout, left-right sides
• Extend all the ESP pads 'a smidge'
• Connect pin 2 (see https://github.com/esp8266/esp8266-wiki/wiki/Boot-Process#esp-boot-modes)
• Add screw/mounting holes
• surface mount rgb (ws2812 or apa102 'DotStar')
  • apa102 docs https://learn.sparkfun.com/tutorials/esp8266-thing-hookup-guide/using-the-arduino-addon
  • apa102 buy http://www.aliexpress.com/item/10-1000pcs-APA102-LEDs-Chips-IC-SMD-5050-RGB-For-Strip-Screen-with-DATA-and-CLOCK/32496285065.html
  • ws2812 buy http://www.aliexpress.com/item/10-1000pcs-WS2812B-4pins-5050-SMD-Black-White-version-WS2812-Individually-Addressable-Digital-RGB-LED-Chip/32453497583.html
• Turn around esp8266
• extend antenna pads slightly
• 10k resistor all the things

• fix capacitor trace
• connect center ground pins
• 15 to gnd, use one of the center pins

Pinout data

http://www.esp8266.com/viewtopic.php?p=45746

new chip $2.60/each QFN32 5mm

http://www.ebay.com/itm/like/172263272606?lpid=82&chn=ps&ul_noapp=true

http://espressif.com/sites/default/files/documentation/0a-esp8285_datasheet_en_0.pdf

breakout https://pcbs.io/share/zMQDz

2016-Aug-6

• WORKS GND: 1[gnd],9[GPIO15/sdcard],17,18,19,20[4xcenter_ground] PWR: 3,4[cdpd],12[GPIO0/load-flash],11[GPIO2/justhigh]

2016 Sep esp-square boot ' ets Jan 8 2013,rst cause:2, boot mode:(3,6)'

2016 Sep esp-square download ' ets Jan 8 2013,rst cause:2, boot mode:(1,6)'

2017 fail 'ets Jan 8 2013,rst cause:1, boot mode:(5,7)'

reset causes http://www.esp8266.com/viewtopic.php?p=2096#p2112

 reset causes:
      0:
      1: normal boot
      2: reset pin
      3: software reset
      4: watchdog reset

  boot device:
      0:
      1: ram
      3: flash

boot mode (x,y); x = [. . . . . GPIO15 GPIO0 GPIO2]

https://github.com/esp8266/esp8266-wiki/wiki/Boot-Process#esp-boot-modes

• Dust DSM501A
• Gas TGS2600
• Sound SPH0641LU4H-1
• Temp DS18B20
• Light

• Grounds: 1 or [17,18,19,20]
• Power: 3
• NeedHigh: 4[float ok], 11[float ok], 12[float ok]
• NeedLow: 9

• NeedHigh: 4

• Cut pin 5!
• drop status led?
• swap ANT and NeoPx
• add single neopx?

warmup while on 'W' on WARM
place board 
wait until 0:15
turn up heat
wait until 1:30

• put GPIO2 on the NeoPix port
• route gpio2 to 3535 neopix, then to neopix port.
• smaller regulator?
• swap temperature/ds18 pins
• usb serial chip? on the front of the square board, with handsolder pins

• 3535 goes in with window square thing UP
• first: power led+resistor+usb
• test: lm1117 in/gnd pads for +5
• second: esp8266
• third: lm1117
• test: 3535 pwr/gnd pads
• fourth: 3535

• 5v rail fix!
• wider 3535 pads
• two 3535 slots
• jst-whatever plugs all around
• +5v input/gnd pinholes

• consider neopix port 5v as power source to board
• plug/terminator for neopx strip, with wifi and apps! JST-SM connector (3pin)
• light sensor
• oled big connector on bottom
• TODO: reevaluate GPIO0, SDCARD, GPIO2 to NeoPix port & Onboard Pix?

• Microcontroller
  • esp8285 www.aliexpress.com/item/ESP8285-WiFi-built-in-flash-1MByte-chip/32688480863.html
  • (see peskyproducts boards https://www.tindie.com/stores/onehorse/)
  • esp3212 https://world.taobao.com/item/537990378649.htm
  • esp32 (waiting) + winbond 4mb flash w25q32fv
• USB/Serial
  • USB Serial CP2102N, bonus 100ma 3.3v reg $1.66 (out of stock)
  • FT230X, batt chg detection, QFN16 4×4 $2.04
  • XR21V1410, QFN16 3×3 $3.88
• Volt Regulator
  • lm2937-3.3 500ma LM2937ESX-3.3/NOPB In 26V $1.81
  • LD39050PU33R 500ma in 5.5V DFN-6 $1.03
• CPUs
  • EFM8LB12F64E-B-QFN32 8051 64k flash, 4k ram $1.71
• Radios
• Connectors
  • JST-XH (Lipo balance plug) ordered from aliexpress 2016-Sep-17
  • JST-SM 2.5mm (neopix strip plug) ordered from Amazon 2016-Sep-17
• Displays
  • 0.49“ OLED, 14pin flex. ordered from aliexpress
• VEML6040 RGB sensor $2.17

• 8285 GND unconnected! (fixed)
• power/status leds resistor in parallel (fixed)

• ESP needs a 26MHz Clock + 2 10pF caps
• JST connecors were changed to the wrong size
• power CAP back-fed into data pin and fried! zener diode BAT-54S?
• level-shifter BSS138L for neopix gpio?
• 330 ohm gpio?

• Connect EXT_RESET to 10k R + high
• Connect R12 to 12k R + low
• add pinout for SPI/ADA102?

• Fix cross-wiring at 3535

• NodeMCU Build
  • package list: (std) + ws2812, mdns

• notes: major flashing trouble.
  • fixed: bad row on breadboard
  • not sure fix: esptool --flash_freq 80m --flash_mode dio
• Todo
  • add SPI interface (add 10k resistor to pin9/gpio15)
  • order more!

• Drop pin9 resistor, restore ground
• Run clk and mosi to bottom/neopix row (share clk)

• Flash nodemcu-master-13-modules-2017-07-22-16-46-41-float.bin
• Load init.lua, rainbow.lua, wifigo.lua

• HSPI (spi 1) GPIO12/MISO, GPIO13/MOSI, GPIO14/CLK, GPIO15/CS